diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 6cbcf36c..e9b73699 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -81,7 +81,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.11"]
         # 5 batches, each installs ONLY the toolchains its languages need (steps gated by matrix.batch).
-        # Node/Python/uv stay in every batch (cheap, needed for the venv + auto-installed LSes).
+        # Python/uv stay in every batch; Node is limited to other-langs and catch-all.
         # catch-all = web + python + the core framework.
         batch: [jvm, native, other-langs, niche, catch-all]
         # --- OS gating: which batch runs on which OS -----------------------------------------
@@ -106,9 +106,10 @@ jobs:
         with:
           go-version: ">=1.17.0"
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        if: matrix.batch == 'other-langs' || matrix.batch == 'catch-all'
+        uses: actions/setup-node@v7
         with:
-          node-version: '20.x'
+          node-version: '24.x'
       - name: Ensure cached directory exist before calling cache-related actions
         shell: bash
         run: |
diff --git a/.serena/memories/adding_new_language_support_guide.md b/.serena/memories/adding_new_language_support_guide.md
index adf97b18..162683e7 100644
--- a/.serena/memories/adding_new_language_support_guide.md
+++ b/.serena/memories/adding_new_language_support_guide.md
@@ -66,6 +66,50 @@ To implement a new language server using the DependencyProvider pattern:
 
 You should look at at least one existing implementation of each base class to understand how they work.
 
+#### Downloading Runtime Dependencies
+
+Use `DownloadedDependency` (in `solidlsp.dependency_provider`), which bundles the URL, 
+archive type, allowed hosts and checksum verification behind a single `download_to()` call:
+
+```python
+dep = DownloadedDependency(
+    url=f"https://example.org/foo-{version}-{platform}.zip",
+    archive_type="zip",              # optional FileUtils.ArchiveType for extraction
+    allowed_hosts=FOO_ALLOWED_HOSTS, # optional list of allowed hosts 
+)
+dep.download_to(target_dir)
+```
+
+Checksums for downloads live in a URL-keyed database, `src/solidlsp/resources/downloaded_dependency_hashes.json`,
+managed by `DownloadedDependencyHashDatabase`. 
+
+Consequences for your implementation:
+
+  * Build each dependency in a factory classmethod (`_create_dep_*`) that takes an
+    optional version and falls back to the pinned `DEFAULT_*` constant. 
+  * Add an `update_dep_hashes()` classmethod that constructs every dependency
+    and updates the hashes:
+    ```python
+    @classmethod
+    def update_dep_hashes(cls) -> None:
+        deps = [cls._create_dep_foo(), cls_._create_dep_bar(), ...]
+        with DownloadedDependencyHashDatabase.get_instance().update_context() as db:
+            for dep in deps:
+                db.update(dep)
+    ```
+    Hook a call to this method into `scripts/update_downloaded_dependency_hashes.py`, run that script,
+    and commit the resulting JSON changes.
+  * After bumping any pinned version, re-run the script. Add a NOTE comment next to
+    the version constants saying so; a stale database means unverified downloads
+    locally and a CI failure.
+  * Pass `verified=False` only for dependencies whose hash cannot be pinned by design
+    (e.g. a user-supplied version override).
+
+Reference implementation: `EclipseJDTLS.DependencyProvider` 
+
+Note that several older language servers still define hashes locally in constants and 
+call `FileUtils.download_and_extract_archive_verified`directly. Do not apply this legacy approach.
+
 ### 1.2 LSP Initialization
 
 Override `_create_base_initialize_params` to provide server-specific initialization
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a895d15..bc1ac42d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,11 @@ Status of the `main` branch. Changes prior to the next official version change w
   - Fix: F#'s `module <Name>` declarations reported a `selectionRange` pointing at the `module`
     keyword instead of at `<Name>`, so looking up hover/references from a module symbol's position
     returned the keyword's own docs instead of the module's #925
+  - Fix: Erlang functions could not be addressed by any tool taking an exact name path, because
+    Erlang LS identifies them as `name/arity` and `/` separates name path components. The arity is
+    now separated by `#` instead (e.g. `create_user#4`), so the reported name path round-trips and
+    `find_referencing_symbols`/`replace_symbol_body`/`insert_after_symbol` work on Erlang
+    functions #1797
   - Fix: `LSPFileBuffer`: a stale content hash could be returned if files are kept open 
     and file contents were not read before trying to retrieve the hash value  
   - Fix: Change semantics of file opening (`open_file`) in the language server from "open file (if not already open)"
diff --git a/docs/01-about/020_programming-languages.md b/docs/01-about/020_programming-languages.md
index 46d764db..00bfe33b 100644
--- a/docs/01-about/020_programming-languages.md
+++ b/docs/01-about/020_programming-languages.md
@@ -68,7 +68,8 @@ Some languages require additional installations or setup steps, as noted.
 * **Elm**  
   (requires Elm compiler)
 * **Erlang**  
-  (requires installation of beam and [erlang_ls](https://github.com/erlang-ls/erlang_ls); experimental, might be slow or hang)
+  (requires installation of beam and [erlang_ls](https://github.com/erlang-ls/erlang_ls); experimental, might be slow or hang;
+  note that functions are addressed as `name#arity`, e.g. `create_user#4`, because `/` is reserved as the name path separator)
 * **F#**  
   (requires [.NET v8.0+](https://dotnet.microsoft.com/en-us/download/dotnet); uses FsAutoComplete/Ionide, which is auto-installed; for Homebrew .NET on macOS, set DOTNET_ROOT in your environment)
 * **Fortran**   
diff --git a/scripts/update_downloaded_dependency_hashes.py b/scripts/update_downloaded_dependency_hashes.py
new file mode 100644
index 00000000..b82eab1d
--- /dev/null
+++ b/scripts/update_downloaded_dependency_hashes.py
@@ -0,0 +1,7 @@
+from sensai.util import logging
+
+from solidlsp.language_servers.eclipse_jdtls import EclipseJDTLS
+
+if __name__ == "__main__":
+    logging.configure()
+    EclipseJDTLS.DependencyProvider.update_dep_hashes()
diff --git a/src/solidlsp/dependency_provider.py b/src/solidlsp/dependency_provider.py
index 386e14d5..21dccb4e 100644
--- a/src/solidlsp/dependency_provider.py
+++ b/src/solidlsp/dependency_provider.py
@@ -1,10 +1,16 @@
+import json
 import logging
 import os
 import shutil
+import tempfile
+import threading
 from abc import ABC, abstractmethod
-from collections.abc import Sequence
+from collections.abc import Iterator, Sequence
+from contextlib import contextmanager
+from os import PathLike
 
-from solidlsp.settings import SolidLSPSettings
+from solidlsp.ls_utils import FileUtils, is_running_in_ci
+from solidlsp.settings import SOLIDLSP_RESOURCES_DIR, SolidLSPSettings
 
 log = logging.getLogger(__name__)
 
@@ -239,3 +245,125 @@ class LanguageServerDependencyProviderUvx(LanguageServerDependencyProviderBaseCo
 
     def _create_launch_command_from_base_command(self, base_command: list[str]) -> list[str]:
         return base_command + list(self._extra_args)
+
+
+class DownloadedDependencyHashDatabase:
+    RESOURCE_FILE_NAME = "downloaded_dependency_hashes.json"
+    _instance: "DownloadedDependencyHashDatabase | None" = None
+    _instance_lock: threading.Lock = threading.Lock()
+
+    def __init__(self, _singleton: bool):
+        self._json_file = os.path.join(SOLIDLSP_RESOURCES_DIR, self.RESOURCE_FILE_NAME)
+        self._hashes = {}
+        if os.path.exists(self._json_file):
+            try:
+                with open(self._json_file, encoding="utf-8") as f:
+                    self._hashes = json.load(f)
+            except:
+                log.warning("Error loading %s", self._json_file, exc_info=True)
+
+    @classmethod
+    def get_instance(cls) -> "DownloadedDependencyHashDatabase":
+        if cls._instance is None:
+            with cls._instance_lock:
+                if cls._instance is None:
+                    cls._instance = DownloadedDependencyHashDatabase(True)
+        return cls._instance
+
+    def get_sha256(self, dep: "DownloadedDependency") -> str | None:
+        return self._hashes.get(dep.get_url())
+
+    class Updater:
+        def __init__(self, db: "DownloadedDependencyHashDatabase"):
+            self._db = db
+
+        def update(self, dep: "DownloadedDependency", force: bool = False) -> None:
+            """
+            :param dep: the dependency to update the hash for
+            :param force: whether to force an update even if the hash already exists
+            """
+            self._db._update(dep, force)
+
+    @contextmanager
+    def update_context(self) -> Iterator[Updater]:
+        try:
+            yield self.Updater(self)
+        finally:
+            self._save()
+
+    def _update(self, dep: "DownloadedDependency", force: bool = False) -> None:
+        if not force and dep.get_url() in self._hashes:
+            log.info("SHA256 for %s already exists, skipping update", dep.get_url())
+            return
+        try:
+            with tempfile.TemporaryDirectory() as temp_dir:
+                path = os.path.join(temp_dir, "downloaded_dependency")
+                log.info("Downloading %s for hash calculation", dep.get_url())
+                FileUtils.download_file(dep.get_url(), path)
+                sha = FileUtils.calculate_sha256(path)
+                log.info("SHA256 for %s: %s", dep.get_url(), sha)
+                self._hashes[dep.get_url()] = sha
+        except:
+            log.warning("Error updating hash for %s", dep.get_url(), exc_info=True)
+
+    def _save(self) -> None:
+        try:
+            with open(self._json_file, "w", encoding="utf-8") as f:
+                json.dump(self._hashes, f, indent=2)
+        except:
+            log.warning("Error saving %s", self._json_file, exc_info=True)
+
+
+class DownloadedDependency:
+    """
+    Represents a dependency that can be downloaded from a URL, optionally verified against a known SHA256 hash,
+    and optionally extracted if it is an archive.
+    """
+
+    def __init__(
+        self,
+        url: str,
+        archive_type: FileUtils.ArchiveType | None = None,
+        allowed_hosts: Sequence[str] | None = None,
+        verified: bool = True,
+    ):
+        """
+        :param url: the URL of the file to be downloaded
+        :param archive_type: optional type of archive for the case where `url` points to an archive.
+            Use `None` or "binary" for a binary file (no extraction).
+        :param allowed_hosts: optional list of allowed hosts for the download URL
+        :param verified: whether to verify the downloaded file against a known SHA256 hash (if available).
+            If enabled and the hash for the URL is not known, will raise an exception in CI and issue a warning
+            in non-CI environments.
+        """
+        self._url = url
+        self._allowed_hosts = allowed_hosts
+        self._archive_type = archive_type if archive_type is not None else "binary"
+        self._verified = verified
+
+    def get_url(self) -> str:
+        return self._url
+
+    def download_to(self, target_path: str | PathLike) -> None:
+        """
+        Downloads the dependency to the specified target path.
+        If defined at construction, will apply hash verification and archive extraction.
+
+        :param target_path: the path to which the dependency should be downloaded (or extracted if applicable)
+        """
+        if not isinstance(target_path, str):
+            target_path = str(target_path)
+        if self._verified:
+            sha256 = DownloadedDependencyHashDatabase.get_instance().get_sha256(self)
+            if sha256 is None:
+                if is_running_in_ci():
+                    raise RuntimeError(
+                        f"No SHA256 hash found for {self._url}. "
+                        "Please update the hash database by running 'scripts/update_downloaded_dependency_hashes.py'."
+                    )
+                log.warning("No SHA256 hash found for %s. The downloaded file will not be verified.", self._url)
+        else:
+            sha256 = None
+        FileUtils.download_and_extract_archive_verified(
+            self._url, target_path, archive_type=self._archive_type, expected_sha256=sha256, allowed_hosts=self._allowed_hosts
+        )
diff --git a/src/solidlsp/language_servers/common.py b/src/solidlsp/language_servers/common.py
index e5e7ca84..d5be6807 100644
--- a/src/solidlsp/language_servers/common.py
+++ b/src/solidlsp/language_servers/common.py
@@ -24,7 +24,7 @@ class RuntimeDependency:
     url: str | None = None
     sha256: str | None = None
     allowed_hosts: tuple[str, ...] | list[str] | None = None
-    archive_type: str | None = None
+    archive_type: FileUtils.ArchiveType | None = None
     binary_name: str | None = None
     command: str | list[str] | None = None
     package_name: str | None = None
diff --git a/src/solidlsp/language_servers/eclipse_jdtls.py b/src/solidlsp/language_servers/eclipse_jdtls.py
index a67392fb..94531a9a 100644
--- a/src/solidlsp/language_servers/eclipse_jdtls.py
+++ b/src/solidlsp/language_servers/eclipse_jdtls.py
@@ -13,18 +13,20 @@ import re
 import shutil
 import subprocess
 import threading
+from dataclasses import dataclass
 from pathlib import Path, PurePath
 from time import sleep
-from typing import Any, cast
+from typing import Any
 
 from overrides import override
 
 from solidlsp import ls_types
+from solidlsp.dependency_provider import DownloadedDependency, DownloadedDependencyHashDatabase
 from solidlsp.ls import LanguageServerDependencyProvider, LSPFileBuffer, SolidLanguageServer
 from solidlsp.ls_config import LanguageServerConfig
 from solidlsp.ls_exceptions import SolidLSPException
 from solidlsp.ls_types import UnifiedSymbolInformation
-from solidlsp.ls_utils import FileUtils, PlatformUtils
+from solidlsp.ls_utils import PlatformUtils
 from solidlsp.lsp_protocol_handler.lsp_types import DocumentSymbol, SymbolInformation
 from solidlsp.settings import SolidLSPSettings
 from solidlsp.util.subprocess_util import subprocess_run
@@ -32,7 +34,6 @@ from solidlsp.util.subprocess_util import subprocess_run
 log = logging.getLogger(__name__)
 
 GRADLE_ALLOWED_HOSTS = ("services.gradle.org", "github.com", "release-assets.githubusercontent.com", "objects.githubusercontent.com")
-GRADLE_SHA256 = "7197a12f450794931532469d4ff21a59ea2c1cd59a3ec3f89c035c3c420a6999"
 VSCODE_JAVA_ALLOWED_HOSTS = ("github.com", "release-assets.githubusercontent.com", "objects.githubusercontent.com")
 INTELLICODE_ALLOWED_HOSTS = (
     "visualstudioexptteam.gallery.vsassets.io",
@@ -41,30 +42,6 @@ INTELLICODE_ALLOWED_HOSTS = (
 )
 
 
-# Version pinning convention (read this before bumping anything below):
-#
-#   INITIAL_* — the very first version we shipped runtime-dependency support for, paired with
-#       its SHA. NEVER edited. The legacy unversioned install directory (e.g. "vscode-java/")
-#       is reserved exclusively for this version, so users who installed under the original
-#       layout keep their existing cache forever.
-#
-#   DEFAULT_* — the version (and matching SHA) used when the user does not override via
-#       custom_settings. THIS is what we edit to upgrade: copy the new version + new SHA over
-#       the existing DEFAULT_* literals, leave INITIAL_* alone.
-#
-# Resolution at install time:
-#   resolved_version = custom_settings.get("..._version", DEFAULT_*_VERSION)
-#   - resolved == INITIAL_*  -> legacy unversioned dir,           SHA = INITIAL_*_SHA256
-#   - resolved == DEFAULT_*  -> versioned dir "{name}-{resolved}", SHA = DEFAULT_*_SHA256
-#   - any other version      -> versioned dir "{name}-{resolved}", SHA verification skipped
-#
-# Consequences of this scheme:
-#   - Bumping DEFAULT_* makes new installs land in a new versioned subdir => no silent reuse
-#     of stale binaries (the bug this scheme exists to fix).
-#   - Previously-downloaded versions are not lost: a user can request any past version via
-#     custom_settings and the matching cached subdir is picked up without re-downloading.
-#   - INITIAL_* and DEFAULT_* hold identical literals when first introduced; they diverge on
-#     the first DEFAULT_* bump and stay independent thereafter.
 @dataclasses.dataclass(frozen=True)
 class VsixResourcePaths:
     """
@@ -81,40 +58,6 @@ class VsixResourcePaths:
     equinox_launcher_basename: str  # e.g. "org.eclipse.equinox.launcher_1.7.0.v20250424-1814.jar"
 
 
-INITIAL_VSCODE_JAVA_VERSION = "1.42.0-561"
-INITIAL_VSCODE_JAVA_SHA256_BY_PLATFORM = {
-    "osx-arm64": "bc00c2699d4b8d478eb9a1621db9d6d3a12ea0dcc247a9cd8040e8ac19c03933",
-    "osx-x64": "03ae1db1a22c15561a620f1b722d6797d35d4faaa7c4666dbe6ca2715089852f",
-    "linux-arm64": "e15bc9b2a665d3453203402621b5441062aa41b0ec2d140661f439326fd248c1",
-    "linux-x64": "7660b7b527be6fda46a917966b34d828e7416d5cc84287b29b88e7b99c1737f9",
-    "win-x64": "ef195b45bd260976ad2e84618f4044b5d7248deed41d647573f0ee22c4233df3",
-}
-INITIAL_VSCODE_JAVA_PATHS = VsixResourcePaths(
-    jre_version="21.0.7",
-    lombok_jar_basename="lombok-1.18.36.jar",
-    equinox_launcher_basename="org.eclipse.equinox.launcher_1.7.0.v20250424-1814.jar",
-)
-# Bumped from 1.42.0-561 to surface Lombok-generated methods (#1432); brings JDTLS commit b2d8952
-# (java.symbols.includeGeneratedCode), JRE 21.0.10, Lombok 1.18.39 and Equinox launcher 1.7.100.
-DEFAULT_VSCODE_JAVA_VERSION = "1.54.0-923"
-DEFAULT_VSCODE_JAVA_SHA256_BY_PLATFORM = {
-    "osx-arm64": "c54c45cb0d2579d8e0a4ddeb24d4a9dd0b460d07d9366adea2b38a1da22a463c",
-    "osx-x64": "dfc98abc4e54165a78372e280242a039671729b1b03420608df3b10c6b629fb6",
-    "linux-arm64": "e2bb22c427d90da8dbb1afff72ff1e2dce38d50b76deb02d7bc313a330a1330c",
-    "linux-x64": "9d4b15da54e25a0192f9bac073f086c015397d3676623b68dbf83a5dbaf5132b",
-    "win-x64": "66f3914987edeccfee8a2558470e0fde4f8c4154232ff4baa5d73373ebc819d4",
-}
-DEFAULT_VSCODE_JAVA_PATHS = VsixResourcePaths(
-    jre_version="21.0.10",
-    lombok_jar_basename="lombok-1.18.39-4050.jar",
-    equinox_launcher_basename="org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar",
-)
-
-INITIAL_INTELLICODE_VERSION = "1.2.30"
-INITIAL_INTELLICODE_SHA256 = "7f61a7f96d101cdf230f96821be3fddd8f890ebfefb3695d18beee43004ae251"
-DEFAULT_INTELLICODE_VERSION = "1.2.30"
-DEFAULT_INTELLICODE_SHA256 = "7f61a7f96d101cdf230f96821be3fddd8f890ebfefb3695d18beee43004ae251"
-
 # Mapping from Serena's platform identifiers to upstream JDTLS config_<platform> directory names
 JDTLS_CONFIG_DIR_BY_PLATFORM = {
     "osx-arm64": "config_mac_arm",
@@ -150,6 +93,19 @@ class RuntimeDependencyPaths:
     intellisense_members_path: str | None = None
 
 
+@dataclass
+class VSCodeJavaConfig:
+    """
+    Represents a (platform-specific) configuration for VSCode Java
+    """
+
+    jre_home_path: str
+    jre_path: str
+    lombok_jar_path: str
+    jdtls_launcher_jar_path: str
+    jdtls_readonly_config_path: str
+
+
 class EclipseJDTLS(SolidLanguageServer):
     r"""
     The EclipseJDTLS class provides a Java specific implementation of the LanguageServer class
@@ -271,6 +227,56 @@ class EclipseJDTLS(SolidLanguageServer):
         return self.DependencyProvider(self._custom_settings, ls_resources_dir, self._solidlsp_settings, self.repository_root_path)
 
     class DependencyProvider(LanguageServerDependencyProvider):
+        """
+        Dependency provider for Eclipse JDTLS.
+
+        Version pinning convention (read this before bumping anything below):
+
+          INITIAL_* — the very first version we shipped runtime-dependency support for, paired with
+              its SHA. NEVER edited. The legacy unversioned install directory (e.g. "vscode-java/")
+              is reserved exclusively for this version, so users who installed under the original
+              layout keep their existing cache forever.
+
+          DEFAULT_* — the version (and matching SHA) used when the user does not override via
+              custom_settings. THIS is what we edit to upgrade: copy the new version + new SHA over
+              the existing DEFAULT_* literals, leave INITIAL_* alone.
+
+        Resolution at install time:
+          resolved_version = custom_settings.get("..._version", DEFAULT_*_VERSION)
+          - resolved == INITIAL_*  -> legacy unversioned dir,           SHA = INITIAL_*_SHA256
+          - resolved == DEFAULT_*  -> versioned dir "{name}-{resolved}", SHA = DEFAULT_*_SHA256
+          - any other version      -> versioned dir "{name}-{resolved}", SHA verification skipped
+
+        Consequences of this scheme:
+          - Bumping DEFAULT_* makes new installs land in a new versioned subdir => no silent reuse
+            of stale binaries (the bug this scheme exists to fix).
+          - Previously-downloaded versions are not lost: a user can request any past version via
+            custom_settings and the matching cached subdir is picked up without re-downloading.
+          - INITIAL_* and DEFAULT_* hold identical literals when first introduced; they diverge on
+            the first DEFAULT_* bump and stay independent thereafter.
+        """
+
+        # versions used initially (which use default paths without version suffix)
+        INITIAL_VSCODE_JAVA_VERSION = "1.42.0-561"
+        INITIAL_INTELLICODE_VERSION = "1.2.30"
+        INITIAL_VSCODE_JAVA_PATHS = VsixResourcePaths(
+            jre_version="21.0.7",
+            lombok_jar_basename="lombok-1.18.36.jar",
+            equinox_launcher_basename="org.eclipse.equinox.launcher_1.7.0.v20250424-1814.jar",
+        )
+
+        # currently used default versions
+        # NOTE: After bumping any of these, also update the corresponding hashes by running
+        #       scripts/update_downloaded_dependency_hashes.py and commit the resulting changes.
+        DEFAULT_GRADLE_VERSION = "8.14.2"
+        DEFAULT_VSCODE_JAVA_VERSION = "1.54.0-923"
+        DEFAULT_INTELLICODE_VERSION = "1.2.30"
+        DEFAULT_VSCODE_JAVA_PATHS = VsixResourcePaths(
+            jre_version="21.0.10",
+            lombok_jar_basename="lombok-1.18.39-4050.jar",
+            equinox_launcher_basename="org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar",
+        )
+
         def __init__(
             self,
             custom_settings: SolidLSPSettings.CustomLSSettings,
@@ -283,9 +289,57 @@ class EclipseJDTLS(SolidLanguageServer):
             self._repository_root_path = repository_root_path
             self.runtime_dependency_paths = self._setup_runtime_dependencies(ls_resources_dir, custom_settings)
 
-        @staticmethod
+        @classmethod
+        def _create_dep_gradle(cls, gradle_version: str | None = None) -> DownloadedDependency:
+            gradle_version = gradle_version or cls.DEFAULT_GRADLE_VERSION
+            return DownloadedDependency(
+                url=f"https://services.gradle.org/distributions/gradle-{gradle_version}-bin.zip",
+                archive_type="zip",
+                allowed_hosts=GRADLE_ALLOWED_HOSTS,
+                verified=gradle_version == cls.DEFAULT_GRADLE_VERSION,
+            )
+
+        @classmethod
+        def _create_deps_vscode_java(cls, vscode_java_version: str | None = None) -> dict[str, DownloadedDependency]:
+            vscode_java_version = vscode_java_version or cls.DEFAULT_VSCODE_JAVA_VERSION
+            vscode_java_tag = f"v{vscode_java_version.rsplit('-', 1)[0]}"
+            urls = {
+                "osx-arm64": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-darwin-arm64-{vscode_java_version}.vsix",
+                "osx-x64": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-darwin-x64-{vscode_java_version}.vsix",
+                "linux-arm64": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-linux-arm64-{vscode_java_version}.vsix",
+                "linux-x64": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-linux-x64-{vscode_java_version}.vsix",
+                "win-x64": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-win32-x64-{vscode_java_version}.vsix",
+            }
+            deps = {}
+            for platform_key, url in urls.items():
+                deps[platform_key] = DownloadedDependency(
+                    url=url,
+                    archive_type="zip",
+                    allowed_hosts=VSCODE_JAVA_ALLOWED_HOSTS,
+                    verified=vscode_java_version == cls.DEFAULT_VSCODE_JAVA_VERSION,
+                )
+            return deps
+
+        @classmethod
+        def _create_dep_intellicode(cls, intellicode_version: str | None = None) -> DownloadedDependency:
+            intellicode_version = intellicode_version or cls.DEFAULT_INTELLICODE_VERSION
+            return DownloadedDependency(
+                url=f"https://VisualStudioExptTeam.gallery.vsassets.io/_apis/public/gallery/publisher/VisualStudioExptTeam/extension/vscodeintellicode/{intellicode_version}/assetbyname/Microsoft.VisualStudio.Services.VSIXPackage",
+                archive_type="zip",
+                allowed_hosts=INTELLICODE_ALLOWED_HOSTS,
+                verified=intellicode_version == cls.DEFAULT_INTELLICODE_VERSION,
+            )
+
+        @classmethod
+        def update_dep_hashes(cls) -> None:
+            deps = [cls._create_dep_gradle(), cls._create_dep_intellicode()] + list(cls._create_deps_vscode_java().values())
+            with DownloadedDependencyHashDatabase.get_instance().update_context() as db:
+                for dep in deps:
+                    db.update(dep)
+
+        @classmethod
         def _setup_runtime_dependencies(
-            ls_resources_dir: str, custom_settings: SolidLSPSettings.CustomLSSettings
+            cls, ls_resources_dir: str, custom_settings: SolidLSPSettings.CustomLSSettings
         ) -> RuntimeDependencyPaths:
             """
             Setup runtime dependencies for EclipseJDTLS and return the paths.
@@ -313,145 +367,72 @@ class EclipseJDTLS(SolidLanguageServer):
                 return EclipseJDTLS.DependencyProvider._setup_from_existing_install(str(jdtls_path), str(lombok_path), custom_settings)
 
             platformId = PlatformUtils.get_platform_id()
-            gradle_version = custom_settings.get("gradle_version", "8.14.2")
-            vscode_java_version = custom_settings.get("vscode_java_version", DEFAULT_VSCODE_JAVA_VERSION)
-            vscode_java_tag = f"v{vscode_java_version.rsplit('-', 1)[0]}"
-            intellicode_version = custom_settings.get("intellicode_version", DEFAULT_INTELLICODE_VERSION)
-            default_gradle_version = gradle_version == "8.14.2"
+            gradle_version = custom_settings.get("gradle_version", cls.DEFAULT_GRADLE_VERSION)
+            vscode_java_version = custom_settings.get("vscode_java_version", cls.DEFAULT_VSCODE_JAVA_VERSION)
+            intellicode_version = custom_settings.get("intellicode_version", cls.DEFAULT_INTELLICODE_VERSION)
 
             # install-dir name per the version-pinning convention (see module-level block):
             # INITIAL -> legacy unversioned dir; everything else -> "{name}-{resolved}" subdir
             vscode_java_dirname = (
-                "vscode-java" if vscode_java_version == INITIAL_VSCODE_JAVA_VERSION else f"vscode-java-{vscode_java_version}"
+                "vscode-java" if vscode_java_version == cls.INITIAL_VSCODE_JAVA_VERSION else f"vscode-java-{vscode_java_version}"
             )
             intellicode_dirname = (
-                "intellicode" if intellicode_version == INITIAL_INTELLICODE_VERSION else f"intellicode-{intellicode_version}"
+                "intellicode" if intellicode_version == cls.INITIAL_INTELLICODE_VERSION else f"intellicode-{intellicode_version}"
             )
 
-            # SHA is only known for our two pinned versions (INITIAL and current DEFAULT);
-            # for any other user-supplied version we skip verification (returns None)
-            def vscode_java_sha(platform_key: str) -> str | None:
-                if vscode_java_version == INITIAL_VSCODE_JAVA_VERSION:
-                    return INITIAL_VSCODE_JAVA_SHA256_BY_PLATFORM[platform_key]
-                if vscode_java_version == DEFAULT_VSCODE_JAVA_VERSION:
-                    return DEFAULT_VSCODE_JAVA_SHA256_BY_PLATFORM[platform_key]
-                return None
-
-            def intellicode_sha() -> str | None:
-                if intellicode_version == INITIAL_INTELLICODE_VERSION:
-                    return INITIAL_INTELLICODE_SHA256
-                if intellicode_version == DEFAULT_INTELLICODE_VERSION:
-                    return DEFAULT_INTELLICODE_SHA256
-                return None
-
             # Resolve internal VSIX paths (JRE / Lombok / launcher filenames). For pinned versions
             # these are known; for any other user-supplied version we bail out — guessing would
             # silently produce broken paths at JDTLS launch time, which is a worse UX than failing
             # fast here with a pointer to upstream-JDTLS mode (which doesn't need pinned paths).
-            if vscode_java_version == INITIAL_VSCODE_JAVA_VERSION:
-                vsix_paths = INITIAL_VSCODE_JAVA_PATHS
-            elif vscode_java_version == DEFAULT_VSCODE_JAVA_VERSION:
-                vsix_paths = DEFAULT_VSCODE_JAVA_PATHS
+            if vscode_java_version == cls.INITIAL_VSCODE_JAVA_VERSION:
+                vsix_paths = cls.INITIAL_VSCODE_JAVA_PATHS
+            elif vscode_java_version == cls.DEFAULT_VSCODE_JAVA_VERSION:
+                vsix_paths = cls.DEFAULT_VSCODE_JAVA_PATHS
             else:
                 raise SolidLSPException(
                     f"Resource paths inside the vscode-java {vscode_java_version} VSIX are not pinned in serena "
-                    f"(known: {INITIAL_VSCODE_JAVA_VERSION}, {DEFAULT_VSCODE_JAVA_VERSION}). "
-                    f"Either remove the 'vscode_java_version' override (defaults to {DEFAULT_VSCODE_JAVA_VERSION}), "
+                    f"(known: {cls.INITIAL_VSCODE_JAVA_VERSION}, {cls.DEFAULT_VSCODE_JAVA_VERSION}). "
+                    f"Either remove the 'vscode_java_version' override (defaults to {cls.DEFAULT_VSCODE_JAVA_VERSION}), "
                     f"or use upstream JDTLS mode by setting both 'jdtls_path' and 'lombok_path' in "
                     f"ls_specific_settings.java (no pinning required)."
                 )
 
-            runtime_dependencies: dict[str, dict[str, dict[str, object]]] = {
-                "gradle": {
-                    "platform-agnostic": {
-                        "url": f"https://services.gradle.org/distributions/gradle-{gradle_version}-bin.zip",
-                        "archiveType": "zip",
-                        "relative_extraction_path": ".",
-                        "sha256": GRADLE_SHA256 if default_gradle_version else None,
-                        "allowed_hosts": GRADLE_ALLOWED_HOSTS,
-                    }
-                },
-                "vscode-java": {
-                    "darwin-arm64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-darwin-arm64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("osx-arm64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                    },
-                    "osx-arm64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-darwin-arm64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("osx-arm64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                        "jre_home_path": f"extension/jre/{vsix_paths.jre_version}-macosx-aarch64",
-                        "jre_path": f"extension/jre/{vsix_paths.jre_version}-macosx-aarch64/bin/java",
-                        "lombok_jar_path": f"extension/lombok/{vsix_paths.lombok_jar_basename}",
-                        "jdtls_launcher_jar_path": f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
-                        "jdtls_readonly_config_path": "extension/server/config_mac_arm",
-                    },
-                    "osx-x64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-darwin-x64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("osx-x64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                        "jre_home_path": f"extension/jre/{vsix_paths.jre_version}-macosx-x86_64",
-                        "jre_path": f"extension/jre/{vsix_paths.jre_version}-macosx-x86_64/bin/java",
-                        "lombok_jar_path": f"extension/lombok/{vsix_paths.lombok_jar_basename}",
-                        "jdtls_launcher_jar_path": f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
-                        "jdtls_readonly_config_path": "extension/server/config_mac",
-                    },
-                    "linux-arm64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-linux-arm64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("linux-arm64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                        "jre_home_path": f"extension/jre/{vsix_paths.jre_version}-linux-aarch64",
-                        "jre_path": f"extension/jre/{vsix_paths.jre_version}-linux-aarch64/bin/java",
-                        "lombok_jar_path": f"extension/lombok/{vsix_paths.lombok_jar_basename}",
-                        "jdtls_launcher_jar_path": f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
-                        "jdtls_readonly_config_path": "extension/server/config_linux_arm",
-                    },
-                    "linux-x64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-linux-x64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("linux-x64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                        "jre_home_path": f"extension/jre/{vsix_paths.jre_version}-linux-x86_64",
-                        "jre_path": f"extension/jre/{vsix_paths.jre_version}-linux-x86_64/bin/java",
-                        "lombok_jar_path": f"extension/lombok/{vsix_paths.lombok_jar_basename}",
-                        "jdtls_launcher_jar_path": f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
-                        "jdtls_readonly_config_path": "extension/server/config_linux",
-                    },
-                    "win-x64": {
-                        "url": f"https://github.com/redhat-developer/vscode-java/releases/download/{vscode_java_tag}/java-win32-x64-{vscode_java_version}.vsix",
-                        "archiveType": "zip",
-                        "relative_extraction_path": vscode_java_dirname,
-                        "sha256": vscode_java_sha("win-x64"),
-                        "allowed_hosts": VSCODE_JAVA_ALLOWED_HOSTS,
-                        "jre_home_path": f"extension/jre/{vsix_paths.jre_version}-win32-x86_64",
-                        "jre_path": f"extension/jre/{vsix_paths.jre_version}-win32-x86_64/bin/java.exe",
-                        "lombok_jar_path": f"extension/lombok/{vsix_paths.lombok_jar_basename}",
-                        "jdtls_launcher_jar_path": f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
-                        "jdtls_readonly_config_path": "extension/server/config_win",
-                    },
-                },
-                "intellicode": {
-                    "platform-agnostic": {
-                        "url": f"https://VisualStudioExptTeam.gallery.vsassets.io/_apis/public/gallery/publisher/VisualStudioExptTeam/extension/vscodeintellicode/{intellicode_version}/assetbyname/Microsoft.VisualStudio.Services.VSIXPackage",
-                        "alternate_url": f"https://marketplace.visualstudio.com/_apis/public/gallery/publishers/VisualStudioExptTeam/vsextensions/vscodeintellicode/{intellicode_version}/vspackage",
-                        "archiveType": "zip",
-                        "relative_extraction_path": intellicode_dirname,
-                        "sha256": intellicode_sha(),
-                        "allowed_hosts": INTELLICODE_ALLOWED_HOSTS,
-                        "intellicode_jar_path": "extension/dist/com.microsoft.jdtls.intellicode.core-0.7.0.jar",
-                        "intellisense_members_path": "extension/dist/bundledModels/java_intellisense-members",
-                    }
-                },
+            vscode_java_configs: dict[str, VSCodeJavaConfig] = {
+                "osx-arm64": VSCodeJavaConfig(
+                    jre_home_path=f"extension/jre/{vsix_paths.jre_version}-macosx-aarch64",
+                    jre_path=f"extension/jre/{vsix_paths.jre_version}-macosx-aarch64/bin/java",
+                    lombok_jar_path=f"extension/lombok/{vsix_paths.lombok_jar_basename}",
+                    jdtls_launcher_jar_path=f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
+                    jdtls_readonly_config_path="extension/server/config_mac_arm",
+                ),
+                "osx-x64": VSCodeJavaConfig(
+                    jre_home_path=f"extension/jre/{vsix_paths.jre_version}-macosx-x86_64",
+                    jre_path=f"extension/jre/{vsix_paths.jre_version}-macosx-x86_64/bin/java",
+                    lombok_jar_path=f"extension/lombok/{vsix_paths.lombok_jar_basename}",
+                    jdtls_launcher_jar_path=f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
+                    jdtls_readonly_config_path="extension/server/config_mac",
+                ),
+                "linux-arm64": VSCodeJavaConfig(
+                    jre_home_path=f"extension/jre/{vsix_paths.jre_version}-linux-aarch64",
+                    jre_path=f"extension/jre/{vsix_paths.jre_version}-linux-aarch64/bin/java",
+                    lombok_jar_path=f"extension/lombok/{vsix_paths.lombok_jar_basename}",
+                    jdtls_launcher_jar_path=f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
+                    jdtls_readonly_config_path="extension/server/config_linux_arm",
+                ),
+                "linux-x64": VSCodeJavaConfig(
+                    jre_home_path=f"extension/jre/{vsix_paths.jre_version}-linux-x86_64",
+                    jre_path=f"extension/jre/{vsix_paths.jre_version}-linux-x86_64/bin/java",
+                    lombok_jar_path=f"extension/lombok/{vsix_paths.lombok_jar_basename}",
+                    jdtls_launcher_jar_path=f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
+                    jdtls_readonly_config_path="extension/server/config_linux",
+                ),
+                "win-x64": VSCodeJavaConfig(
+                    jre_home_path=f"extension/jre/{vsix_paths.jre_version}-win32-x86_64",
+                    jre_path=f"extension/jre/{vsix_paths.jre_version}-win32-x86_64/bin/java.exe",
+                    lombok_jar_path=f"extension/lombok/{vsix_paths.lombok_jar_basename}",
+                    jdtls_launcher_jar_path=f"extension/server/plugins/{vsix_paths.equinox_launcher_basename}",
+                    jdtls_readonly_config_path="extension/server/config_win",
+                ),
             }
 
             gradle_path = str(
@@ -462,25 +443,20 @@ class EclipseJDTLS(SolidLanguageServer):
             )
 
             if not os.path.exists(gradle_path):
-                gradle_dependency = runtime_dependencies["gradle"]["platform-agnostic"]
-                FileUtils.download_and_extract_archive_verified(
-                    cast(str, gradle_dependency["url"]),
-                    str(PurePath(gradle_path).parent),
-                    cast(str, gradle_dependency["archiveType"]),
-                    expected_sha256=cast(str | None, gradle_dependency["sha256"]),
-                    allowed_hosts=cast(tuple[str, ...], gradle_dependency["allowed_hosts"]),
-                )
+                gradle_dependency = cls._create_dep_gradle(gradle_version)
+                gradle_dependency.download_to(PurePath(gradle_path).parent)
 
             assert os.path.exists(gradle_path)
 
-            dependency = runtime_dependencies["vscode-java"][platformId.value]
-            vscode_java_path = str(PurePath(ls_resources_dir, cast(str, dependency["relative_extraction_path"])))
+            vscode_java_dep = cls._create_deps_vscode_java(vscode_java_version)[platformId.value]
+            vscode_java_cfg = vscode_java_configs[platformId.value]
+            vscode_java_path = str(PurePath(ls_resources_dir, vscode_java_dirname))
             os.makedirs(vscode_java_path, exist_ok=True)
-            jre_home_path = str(PurePath(vscode_java_path, cast(str, dependency["jre_home_path"])))
-            jre_path = str(PurePath(vscode_java_path, cast(str, dependency["jre_path"])))
-            lombok_jar_path = str(PurePath(vscode_java_path, cast(str, dependency["lombok_jar_path"])))
-            jdtls_launcher_jar_path = str(PurePath(vscode_java_path, cast(str, dependency["jdtls_launcher_jar_path"])))
-            jdtls_readonly_config_path = str(PurePath(vscode_java_path, cast(str, dependency["jdtls_readonly_config_path"])))
+            jre_home_path = str(PurePath(vscode_java_path, vscode_java_cfg.jre_home_path))
+            jre_path = str(PurePath(vscode_java_path, vscode_java_cfg.jre_path))
+            lombok_jar_path = str(PurePath(vscode_java_path, vscode_java_cfg.lombok_jar_path))
+            jdtls_launcher_jar_path = str(PurePath(vscode_java_path, vscode_java_cfg.jdtls_launcher_jar_path))
+            jdtls_readonly_config_path = str(PurePath(vscode_java_path, vscode_java_cfg.jdtls_readonly_config_path))
             if not all(
                 [
                     os.path.exists(vscode_java_path),
@@ -491,13 +467,7 @@ class EclipseJDTLS(SolidLanguageServer):
                     os.path.exists(jdtls_readonly_config_path),
                 ]
             ):
-                FileUtils.download_and_extract_archive_verified(
-                    cast(str, dependency["url"]),
-                    vscode_java_path,
-                    cast(str, dependency["archiveType"]),
-                    expected_sha256=cast(str | None, dependency["sha256"]),
-                    allowed_hosts=cast(tuple[str, ...], dependency["allowed_hosts"]),
-                )
+                vscode_java_dep.download_to(vscode_java_path)
 
             os.chmod(jre_path, 0o755)
 
@@ -508,11 +478,13 @@ class EclipseJDTLS(SolidLanguageServer):
             assert os.path.exists(jdtls_launcher_jar_path)
             assert os.path.exists(jdtls_readonly_config_path)
 
-            dependency = runtime_dependencies["intellicode"]["platform-agnostic"]
-            intellicode_directory_path = str(PurePath(ls_resources_dir, cast(str, dependency["relative_extraction_path"])))
+            intellicode_dep = cls._create_dep_intellicode(intellicode_version)
+            intellicode_directory_path = str(PurePath(ls_resources_dir, intellicode_dirname))
             os.makedirs(intellicode_directory_path, exist_ok=True)
-            intellicode_jar_path = str(PurePath(intellicode_directory_path, cast(str, dependency["intellicode_jar_path"])))
-            intellisense_members_path = str(PurePath(intellicode_directory_path, cast(str, dependency["intellisense_members_path"])))
+            intellicode_jar_path = str(
+                PurePath(intellicode_directory_path, "extension/dist/com.microsoft.jdtls.intellicode.core-0.7.0.jar")
+            )
+            intellisense_members_path = str(PurePath(intellicode_directory_path, "extension/dist/bundledModels/java_intellisense-members"))
             if not all(
                 [
                     os.path.exists(intellicode_directory_path),
@@ -520,13 +492,7 @@ class EclipseJDTLS(SolidLanguageServer):
                     os.path.exists(intellisense_members_path),
                 ]
             ):
-                FileUtils.download_and_extract_archive_verified(
-                    cast(str, dependency["url"]),
-                    intellicode_directory_path,
-                    cast(str, dependency["archiveType"]),
-                    expected_sha256=cast(str | None, dependency["sha256"]),
-                    allowed_hosts=cast(tuple[str, ...], dependency["allowed_hosts"]),
-                )
+                intellicode_dep.download_to(intellicode_directory_path)
 
             assert os.path.exists(intellicode_directory_path)
             assert os.path.exists(intellicode_jar_path)
@@ -764,8 +730,9 @@ class EclipseJDTLS(SolidLanguageServer):
             major = int(version_match.group(1))
             return real_home, major
 
-        @staticmethod
+        @classmethod
         def _compute_workspace_hash(
+            cls,
             repository_root_path: str,
             jdtls_launcher_jar_path: str,
             custom_settings: SolidLSPSettings.CustomLSSettings,
@@ -802,7 +769,7 @@ class EclipseJDTLS(SolidLanguageServer):
 
             is_legacy_initial = (
                 not custom_settings.get("jdtls_path")
-                and custom_settings.get("vscode_java_version", DEFAULT_VSCODE_JAVA_VERSION) == INITIAL_VSCODE_JAVA_VERSION
+                and custom_settings.get("vscode_java_version", cls.DEFAULT_VSCODE_JAVA_VERSION) == cls.INITIAL_VSCODE_JAVA_VERSION
                 and not workspace_settings
             )
             if is_legacy_initial:
diff --git a/src/solidlsp/language_servers/erlang_language_server.py b/src/solidlsp/language_servers/erlang_language_server.py
index a9c4897d..f34c93f0 100644
--- a/src/solidlsp/language_servers/erlang_language_server.py
+++ b/src/solidlsp/language_servers/erlang_language_server.py
@@ -6,17 +6,27 @@ import shutil
 import subprocess
 import threading
 import time
+from collections.abc import Hashable
 
 from overrides import override
 
-from solidlsp.ls import SolidLanguageServer
+from solidlsp.ls import RawDocumentSymbol, SolidLanguageServer
 from solidlsp.ls_config import LanguageServerConfig
+from solidlsp.ls_utils import is_running_in_ci
 from solidlsp.lsp_protocol_handler.server import ProcessLaunchInfo
 from solidlsp.settings import SolidLSPSettings
 from solidlsp.util.subprocess_util import subprocess_run
 
 log = logging.getLogger(__name__)
 
+ARITY_SEPARATOR = "#"
+"""
+The character that replaces the `/` in the `name/arity` identifiers reported by Erlang LS.
+
+`#` was chosen because it cannot occur in an unquoted Erlang atom, so it can never collide with a
+real function, type or macro name (unlike `@`, which is a legal atom character).
+"""
+
 
 class ErlangLanguageServer(SolidLanguageServer):
     """Language server for Erlang using Erlang LS."""
@@ -47,6 +57,26 @@ class ErlangLanguageServer(SolidLanguageServer):
         # Set generous timeout for Erlang LS initialization
         self.set_request_timeout(120.0)
 
+    @override
+    def _document_symbols_cache_fingerprint(self) -> Hashable:
+        normalize_symbol_name_version = 1
+        return normalize_symbol_name_version
+
+    @override
+    def _normalize_symbol_name(self, symbol: RawDocumentSymbol, relative_file_path: str) -> str:
+        """
+        Replaces the `/` in Erlang's `name/arity` identifiers, which would otherwise be interpreted
+        as Serena's name path separator.
+
+        Erlang LS names functions, types and parameterised macros `name/arity` (e.g. `create_user/2`).
+        Since `/` separates name path components, such a name is parsed as "symbol `2` nested inside
+        `create_user`" and can never be matched, not even by the very name path that Serena itself
+        reports for the symbol. The arity is not simply dropped because it is part of a function's
+        identity in Erlang: `create_user/2` and `create_user/3` are different functions which may
+        both be defined in the same module.
+        """
+        return symbol["name"].replace("/", ARITY_SEPARATOR)
+
     def _check_erlang_installation(self) -> bool:
         """Check if Erlang/OTP is available."""
         try:
@@ -160,7 +190,7 @@ class ErlangLanguageServer(SolidLanguageServer):
         self.server.notify.initialized({})
 
         # Wait for Erlang LS to be ready - adjust timeout based on environment
-        is_ci = os.getenv("CI") == "true" or os.getenv("GITHUB_ACTIONS") == "true"
+        is_ci = is_running_in_ci()
         is_macos = os.uname().sysname == "Darwin" if hasattr(os, "uname") else False
 
         # macOS in CI can be particularly slow for language server startup
diff --git a/src/solidlsp/language_servers/groovy_language_server.py b/src/solidlsp/language_servers/groovy_language_server.py
index 2d801656..4d7a2f76 100644
--- a/src/solidlsp/language_servers/groovy_language_server.py
+++ b/src/solidlsp/language_servers/groovy_language_server.py
@@ -6,6 +6,7 @@ import dataclasses
 import logging
 import os
 import shlex
+from typing import cast
 
 from solidlsp.ls import SolidLanguageServer
 from solidlsp.ls_config import LanguageServerConfig, LanguageServerId
@@ -184,7 +185,7 @@ class GroovyLanguageServer(SolidLanguageServer):
             java_home_relative_path = java_dependency["java_home_path"]
             java_relative_path = java_dependency["java_path"]
             java_download_url = java_dependency["url"]
-            java_archive_type = java_dependency["archiveType"]
+            java_archive_type = cast(FileUtils.ArchiveType, java_dependency["archiveType"])
             assert java_home_relative_path is not None
             assert java_relative_path is not None
             assert java_download_url is not None
diff --git a/src/solidlsp/ls.py b/src/solidlsp/ls.py
index c9881c60..990b1422 100644
--- a/src/solidlsp/ls.py
+++ b/src/solidlsp/ls.py
@@ -1909,6 +1909,12 @@ class SolidLanguageServer(ABC):
         NOTE: When changing the override of this method after the initial LS implementation,
               be sure to also override `_document_symbols_cache_fingerprint` in order to ensure that
               the caches are invalidated appropriately.
+        NOTE: The returned name must not contain '/', which separates the components of a name path
+              (see :class:`serena.symbol.NamePathMatcher`). A symbol whose name contains it cannot be
+              addressed by any tool taking an exact name path, not even via the name path that is
+              reported for the symbol itself. Language servers that identify symbols in such a way
+              (e.g. Erlang LS, which reports functions as `name/arity`) must substitute another
+              character here.
 
         :param symbol: the symbol
         :param relative_file_path: the relative path of the file the symbol is located in
diff --git a/src/solidlsp/ls_utils.py b/src/solidlsp/ls_utils.py
index b07abd8d..f46f09ea 100644
--- a/src/solidlsp/ls_utils.py
+++ b/src/solidlsp/ls_utils.py
@@ -13,6 +13,7 @@ import tarfile
 import tempfile
 import uuid
 import zipfile
+from collections.abc import Sequence
 from enum import Enum
 from pathlib import Path, PurePath
 from typing import Literal, cast
@@ -28,6 +29,15 @@ from solidlsp.util.subprocess_util import subprocess_run
 log = logging.getLogger(__name__)
 
 
+def is_running_in_ci() -> bool:
+    """
+    Determines whether the current process is running in a Continuous Integration (CI) environment.
+
+    :return: True if running in CI, False otherwise
+    """
+    return os.getenv("CI") == "true" or os.getenv("GITHUB_ACTIONS") == "true"
+
+
 class TextStepper:
     r"""
     A utility class for stepping through a text string line by line, keeping track of the current line and column numbers.
@@ -383,6 +393,8 @@ class FileUtils:
     Utility functions for file operations.
     """
 
+    ArchiveType = Literal["tar", "gztar", "bztar", "xztar", "zip", "zip.gz", "gz", "binary"]
+
     @staticmethod
     def read_file(file_path: str, encoding: str) -> str:
         """
@@ -429,7 +441,7 @@ class FileUtils:
         url: str,
         target_path: str,
         expected_sha256: str | None = None,
-        allowed_hosts: tuple[str, ...] | list[str] | None = None,
+        allowed_hosts: Sequence[str] | None = None,
     ) -> None:
         """
         Downloads a file from ``url`` to ``target_path`` with optional integrity and host validation.
@@ -468,7 +480,7 @@ class FileUtils:
                 Path.unlink(Path(temp_file_path))
 
     @staticmethod
-    def download_and_extract_archive(url: str, target_path: str, archive_type: str) -> None:
+    def download_and_extract_archive(url: str, target_path: str, archive_type: ArchiveType) -> None:
         """
         Downloads the archive from the given URL having format {archive_type} and extracts it to the given {target_path}
         """
@@ -478,9 +490,9 @@ class FileUtils:
     def download_and_extract_archive_verified(
         url: str,
         target_path: str,
-        archive_type: str,
+        archive_type: ArchiveType,
         expected_sha256: str | None = None,
-        allowed_hosts: tuple[str, ...] | list[str] | None = None,
+        allowed_hosts: Sequence[str] | None = None,
     ) -> None:
         """
         Downloads an archive from ``url`` and extracts it safely into ``target_path``.
@@ -560,7 +572,7 @@ class FileUtils:
             raise SolidLSPException(f"Checksum verification failed for '{file_path}': expected {expected_sha256}, got {actual_sha256}")
 
     @staticmethod
-    def _validate_download_host(url: str, allowed_hosts: tuple[str, ...] | list[str] | None) -> None:
+    def _validate_download_host(url: str, allowed_hosts: Sequence[str] | None) -> None:
         """
         Validates that a download URL resolves to one of the configured hosts.
         """
diff --git a/src/solidlsp/resources/downloaded_dependency_hashes.json b/src/solidlsp/resources/downloaded_dependency_hashes.json
new file mode 100644
index 00000000..7fc0bdd9
--- /dev/null
+++ b/src/solidlsp/resources/downloaded_dependency_hashes.json
@@ -0,0 +1,9 @@
+{
+  "https://services.gradle.org/distributions/gradle-8.14.2-bin.zip": "7197a12f450794931532469d4ff21a59ea2c1cd59a3ec3f89c035c3c420a6999",
+  "https://VisualStudioExptTeam.gallery.vsassets.io/_apis/public/gallery/publisher/VisualStudioExptTeam/extension/vscodeintellicode/1.2.30/assetbyname/Microsoft.VisualStudio.Services.VSIXPackage": "7f61a7f96d101cdf230f96821be3fddd8f890ebfefb3695d18beee43004ae251",
+  "https://github.com/redhat-developer/vscode-java/releases/download/v1.54.0/java-darwin-arm64-1.54.0-923.vsix": "c54c45cb0d2579d8e0a4ddeb24d4a9dd0b460d07d9366adea2b38a1da22a463c",
+  "https://github.com/redhat-developer/vscode-java/releases/download/v1.54.0/java-darwin-x64-1.54.0-923.vsix": "dfc98abc4e54165a78372e280242a039671729b1b03420608df3b10c6b629fb6",
+  "https://github.com/redhat-developer/vscode-java/releases/download/v1.54.0/java-linux-arm64-1.54.0-923.vsix": "e2bb22c427d90da8dbb1afff72ff1e2dce38d50b76deb02d7bc313a330a1330c",
+  "https://github.com/redhat-developer/vscode-java/releases/download/v1.54.0/java-linux-x64-1.54.0-923.vsix": "9d4b15da54e25a0192f9bac073f086c015397d3676623b68dbf83a5dbaf5132b",
+  "https://github.com/redhat-developer/vscode-java/releases/download/v1.54.0/java-win32-x64-1.54.0-923.vsix": "66f3914987edeccfee8a2558470e0fde4f8c4154232ff4baa5d73373ebc819d4"
+}
\ No newline at end of file
diff --git a/src/solidlsp/settings.py b/src/solidlsp/settings.py
index a5ee4ace..a1fa3003 100644
--- a/src/solidlsp/settings.py
+++ b/src/solidlsp/settings.py
@@ -16,6 +16,9 @@ if TYPE_CHECKING:
 log = logging.getLogger(__name__)
 
 
+SOLIDLSP_RESOURCES_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "resources")
+
+
 @dataclass
 class SolidLSPSettings:
     """
diff --git a/test/solidlsp/erlang/test_erlang_symbol_names.py b/test/solidlsp/erlang/test_erlang_symbol_names.py
new file mode 100644
index 00000000..e940fb60
--- /dev/null
+++ b/test/solidlsp/erlang/test_erlang_symbol_names.py
@@ -0,0 +1,105 @@
+"""Normalization of Erlang's ``name/arity`` symbol identifiers.
+
+Reproduces https://github.com/oraios/serena/issues/1797: Erlang LS names functions, types and
+parameterised macros ``name/arity`` (e.g. ``create_user/4``), but ``/`` separates the components of
+a Serena name path. Such a name was therefore parsed as "symbol ``4`` nested inside ``create_user``"
+and could never be matched -- not even by the very name path Serena itself reported for the symbol.
+In practice that made ``find_referencing_symbols``, ``replace_symbol_body`` and
+``insert_after_symbol`` unusable on Erlang functions, while read-only browsing kept working, so the
+language looked supported until one tried to do anything with a function.
+
+``ErlangLanguageServer._normalize_symbol_name`` now substitutes
+:data:`~solidlsp.language_servers.erlang_language_server.ARITY_SEPARATOR` for the ``/``, which makes
+the reported name path round-trip back into the symbol tools.
+"""
+
+import os
+
+import pytest
+
+from serena.project import Project
+from serena.symbol import LanguageServerSymbolRetriever
+from solidlsp.language_servers.erlang_language_server import ARITY_SEPARATOR
+from solidlsp.ls_config import LanguageServerId
+from solidlsp.ls_types import SymbolKind, UnifiedSymbolInformation
+from test.conftest import language_server_tests_enabled
+
+pytestmark = [
+    pytest.mark.erlang,
+    pytest.mark.skipif(not language_server_tests_enabled(LanguageServerId.ERLANG), reason="Erlang tests are disabled"),
+]
+
+MODELS_ERL = os.path.join("src", "models.erl")
+SERVICES_ERL = os.path.join("src", "services.erl")
+RECORDS_HRL = os.path.join("include", "records.hrl")
+
+# `models:create_user/4`, spelled the way Serena addresses it
+CREATE_USER_4 = f"create_user{ARITY_SEPARATOR}4"
+
+# file and directory symbols are named after path components, so `/` is legitimate for them
+CONTAINER_KINDS = (SymbolKind.File, SymbolKind.Package)
+
+
+class TestErlangSymbolNames:
+    @pytest.mark.parametrize("project_with_ls", [LanguageServerId.ERLANG], indirect=True)
+    def test_no_symbol_name_contains_the_name_path_separator(self, project_with_ls: Project) -> None:
+        """No Erlang symbol may carry a `/` in its name, since that is the name path separator."""
+        offenders: list[str] = []
+
+        def visit(symbol: UnifiedSymbolInformation) -> None:
+            if symbol["kind"] not in CONTAINER_KINDS and "/" in symbol["name"]:
+                offenders.append(symbol["name"])
+            for child in symbol.get("children", []):
+                visit(child)
+
+        for ls in project_with_ls.get_language_server_manager_or_raise().iter_language_servers():
+            for root in ls.request_full_symbol_tree():
+                visit(root)
+
+        assert not offenders, f"Symbol names containing the name path separator: {sorted(set(offenders))}"
+
+    @pytest.mark.parametrize("project_with_ls", [LanguageServerId.ERLANG], indirect=True)
+    def test_function_name_path_round_trips(self, project_with_ls: Project) -> None:
+        """The name path reported for a function must find that same function again."""
+        retriever = LanguageServerSymbolRetriever(project_with_ls)
+
+        symbol = retriever.find_unique(CREATE_USER_4, within_relative_path=MODELS_ERL)
+        assert symbol.symbol_kind == SymbolKind.Function
+        assert symbol.get_name_path() == CREATE_USER_4
+
+        # feeding the reported name path back in is what used to yield no match at all
+        assert [s.get_name_path() for s in retriever.find(symbol.get_name_path())] == [CREATE_USER_4]
+
+    @pytest.mark.parametrize("project_with_ls", [LanguageServerId.ERLANG], indirect=True)
+    def test_arity_remains_part_of_the_name(self, project_with_ls: Project) -> None:
+        """The arity is kept rather than stripped: it is part of a function's identity in Erlang."""
+        retriever = LanguageServerSymbolRetriever(project_with_ls)
+
+        # models:create_order/3 and services:create_order/2 are different functions
+        models_create_order = retriever.find_unique(f"create_order{ARITY_SEPARATOR}3")
+        services_create_order = retriever.find_unique(f"create_order{ARITY_SEPARATOR}2")
+
+        assert models_create_order.relative_path is not None
+        assert models_create_order.relative_path.replace("\\", "/") == "src/models.erl"
+        assert services_create_order.relative_path is not None
+        assert services_create_order.relative_path.replace("\\", "/") == "src/services.erl"
+
+    @pytest.mark.parametrize("project_with_ls", [LanguageServerId.ERLANG], indirect=True)
+    def test_find_referencing_symbols_locates_a_function(self, project_with_ls: Project) -> None:
+        """The headline symptom of #1797: this used to raise `No symbol matching ...`."""
+        retriever = LanguageServerSymbolRetriever(project_with_ls)
+
+        references = retriever.find_referencing_symbols(CREATE_USER_4, MODELS_ERL)
+
+        # create_user/4 is called from models.erl itself and from at least one other module
+        referencing_paths = {r.symbol.relative_path.replace("\\", "/") for r in references if r.symbol.relative_path is not None}
+        assert referencing_paths, f"Expected references to {CREATE_USER_4}, got none"
+        assert referencing_paths - {"src/models.erl"}, f"Expected cross-file references, got only {referencing_paths}"
+
+    @pytest.mark.parametrize("project_with_ls", [LanguageServerId.ERLANG], indirect=True)
+    def test_names_without_an_arity_are_untouched(self, project_with_ls: Project) -> None:
+        """Records and macros have no arity, so normalization must leave their names alone."""
+        retriever = LanguageServerSymbolRetriever(project_with_ls)
+
+        user_record = retriever.find_unique("user", within_relative_path=RECORDS_HRL)
+        assert user_record.name == "user"
diff --git a/test/solidlsp/java/test_jdtls_path_resolution.py b/test/solidlsp/java/test_jdtls_path_resolution.py
index fa05866e..3bf738b7 100644
--- a/test/solidlsp/java/test_jdtls_path_resolution.py
+++ b/test/solidlsp/java/test_jdtls_path_resolution.py
@@ -545,9 +545,7 @@ class TestComputeWorkspaceHash:
     UPSTREAM_LAUNCHER = "/opt/homebrew/Cellar/jdtls/1.50.0/libexec/plugins/org.eclipse.equinox.launcher_1.7.0.jar"
 
     def _initial_settings(self) -> "SolidLSPSettings.CustomLSSettings":
-        from solidlsp.language_servers.eclipse_jdtls import INITIAL_VSCODE_JAVA_VERSION
-
-        return SolidLSPSettings.CustomLSSettings({"vscode_java_version": INITIAL_VSCODE_JAVA_VERSION})
+        return SolidLSPSettings.CustomLSSettings({"vscode_java_version": EclipseJDTLS.DependencyProvider.INITIAL_VSCODE_JAVA_VERSION})
 
     def test_initial_default_mode_matches_pre_upstream_format(self) -> None:
         """Legacy carve-out: INITIAL default-mode hash MUST equal md5(repository_root_path)."""