[issue #2221] [issue #788] Lombok now adds nullity annotations.

Which 'flavour' is defined in lombok.config; applied to toString, equals, canEqual, and plural-form of `@Singular`.

test/transform/resource/after-ecj/BuilderSingularNullBehavior2.java

@@ -0,0 +1,88 @@
+import java.util.List;
+import lombok.Singular;
+import lombok.Singular.NullCollectionBehavior;
+@lombok.Builder class BuilderSingularNullBehavior2 {
+  public static @java.lang.SuppressWarnings("all") class BuilderSingularNullBehavior2Builder {
+    private @java.lang.SuppressWarnings("all") java.util.ArrayList<String> locations;
+    private @java.lang.SuppressWarnings("all") java.util.ArrayList<String> doohickeys;
+    @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2Builder() {
+      super();
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder location(final String location) {
+      if ((this.locations == null))
+          this.locations = new java.util.ArrayList<String>();
+      this.locations.add(location);
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder locations(final java.util. @org.checkerframework.checker.nullness.qual.NonNull Collection<? extends String> locations) {
+      java.util.Objects.requireNonNull(locations, "locations cannot be null");
+      if ((this.locations == null))
+          this.locations = new java.util.ArrayList<String>();
+      this.locations.addAll(locations);
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder clearLocations() {
+      if ((this.locations != null))
+          this.locations.clear();
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder doohickey(final String doohickey) {
+      if ((this.doohickeys == null))
+          this.doohickeys = new java.util.ArrayList<String>();
+      this.doohickeys.add(doohickey);
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder doohickeys(final java.util. @org.checkerframework.checker.nullness.qual.Nullable Collection<? extends String> doohickeys) {
+      if ((doohickeys != null))
+          {
+            if ((this.doohickeys == null))
+                this.doohickeys = new java.util.ArrayList<String>();
+            this.doohickeys.addAll(doohickeys);
+          }
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder clearDoohickeys() {
+      if ((this.doohickeys != null))
+          this.doohickeys.clear();
+      return this;
+    }
+    public @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2 build() {
+      java.util.List<String> locations;
+      switch (((this.locations == null) ? 0 : this.locations.size())) {
+      case 0 :
+          locations = java.util.Collections.emptyList();
+          break;
+      case 1 :
+          locations = java.util.Collections.singletonList(this.locations.get(0));
+          break;
+      default :
+          locations = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.locations));
+      }
+      java.util.List<String> doohickeys;
+      switch (((this.doohickeys == null) ? 0 : this.doohickeys.size())) {
+      case 0 :
+          doohickeys = java.util.Collections.emptyList();
+          break;
+      case 1 :
+          doohickeys = java.util.Collections.singletonList(this.doohickeys.get(0));
+          break;
+      default :
+          doohickeys = java.util.Collections.unmodifiableList(new java.util.ArrayList<String>(this.doohickeys));
+      }
+      return new BuilderSingularNullBehavior2(locations, doohickeys);
+    }
+    public @java.lang.Override @java.lang.SuppressWarnings("all") java.lang.@org.checkerframework.checker.nullness.qual.NonNull String toString() {
+      return (((("BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder(locations=" + this.locations) + ", doohickeys=") + this.doohickeys) + ")");
+    }
+  }
+  private @Singular(nullBehavior = Singular.NullCollectionBehavior.JDK) List<String> locations;
+  private @Singular(nullBehavior = lombok.Singular.NullCollectionBehavior.IGNORE) List<String> doohickeys;
+  @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2(final List<String> locations, final List<String> doohickeys) {
+    super();
+    this.locations = locations;
+    this.doohickeys = doohickeys;
+  }
+  public static @java.lang.SuppressWarnings("all") BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder builder() {
+    return new BuilderSingularNullBehavior2.BuilderSingularNullBehavior2Builder();
+  }
+}