Get Goto definition for Java classes will not work error.

[HaoYang670]

Hi.

I get Goto definition for Java classes will not work error when using scala metals on vscode:

I have setup the JAVA_HOME on my computer:

$ echo "$JAVA_HOME"
/usr/lib/jvm/java-8-openjdk-amd64

when go into the build target, it shows me this:

How to fix it? Need your help.

[HaoYang670]

I find this error from the log

2023.04.21 15:50:53 ERROR Maven command failed: /usr/bin/apache-maven-3.8.5/bin/mvn generate-sources ch.epfl.scala:bloop-maven-plugin:2.0.0:bloopInstall -DdownloadSources=true

[tgodzik]

JDK source are not installed by default with Java 8 I think. You need to install them manually. If you are using ubuntu you can use sudo apt-get install openjdk-8-source I think.

[markusa380]

@tgodzik I am getting warnings in the Metals doctor, but I am using JDK 17:

java -version
openjdk version "17.0.6" 2023-01-17
OpenJDK Runtime Environment Homebrew (build 17.0.6+0)
OpenJDK 64-Bit Server VM Homebrew (build 17.0.6+0, mixed mode, sharing)

and the Java Home extension setting is empty.

Output of the doctor:

Metals Java: 17.0.6 from Homebrew located at /opt/homebrew/Cellar/openjdk@17/17.0.6/libexec/openjdk.jdk/Contents/Home

....

Build target	Type	Compilation status	Diagnostics	Interactive	Semanticdb	Debugging	Java support	Recommendation
root	Scala 2.13.8	✅	✅	✅	✅	✅	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip
root-test	Scala 2.13.8	✅	✅	✅	✅	✅	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip
grpc-deps	Scala 2.13.8	✅	✅	✅	✅	✅	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip
grpc-deps-test	Scala 2.13.8	✅	✅	✅	✅	✅	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip
eng-xxxxxxxxx-build	sbt 1.6.1	✅	⚠️	✅	✅	❌	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip
eng-xxxxxxxxxxxx-build-build	sbt 1.6.1	✅	⚠️	✅	✅	❌	✅	Goto definition for Java classes will not work, please install jdk sources in java home. Searched: /opt/homebrew/opt/src.zip, /opt/homebrew/opt/lib/src.zip, /opt/homebrew/opt/openjdk@17/src.zip, /opt/homebrew/opt/openjdk@17/lib/src.zip

[tgodzik]

Is the sources jar present there? Somewhere in the home?

[markusa380]

I don't think so, @tgodzik . I don't think they are included, are they?

[tgodzik]

They should, if they aren't there is no sensible way to download them :/

[khanhbq2k]

I'm using jdk 17 also and the src.zip file is not included in the installation, so i downloaded, zipped and move it manually to the lib folder
Source iam using for arch: https://archlinux.org/packages/extra/x86_64/openjdk17-src/