docker: use openjdk for java9

docker/provision/jdk/java-9.sh

@@ -1,4 +1,4 @@
 apt-get update && apt-get install -y wget
-wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/9.0.4+11/c2514751926b4512b076cc82f959763f/jdk-9.0.4_linux-x64_bin.tar.gz -O jdk.tar.gz
+wget https://download.java.net/java/GA/jdk9/9.0.4/binaries/openjdk-9.0.4_linux-x64_bin.tar.gz -O jdk.tar.gz
 tar -xzf jdk.tar.gz -C /opt/
 mv /opt/jdk-9.0.4 /opt/jdk

docker/readme.md

@@ -15,7 +15,7 @@ can download a specific version by adding `--build-arg lombokjar=lombok-<major.m
 The jdk version to be used. Supported values:
 
 - `10` (default)
-- `9` (currently broken because the download is no longer available)
+- `9` (OpenJDK)
 - `8`
 
 The version is also accessible in `JDK_VERSION`.