[Bug] BUILD FAILED in ubuntu 18

[stefanocudini]

in ubuntu 18.04 with openjdk 11 obtain this error after follow the instructions
(gradle installed via apt install gradle, version 4.4.1)

./gradlew run

Downloading https://services.gradle.org/distributions/gradle-6.3-bin.zip
.........10%..........20%..........30%.........40%..........50%..........60%.........70%..........80%..........90%..........100%

Welcome to Gradle 6.3!

Here are the highlights of this release:
 - Java 14 support
 - Improved error messages for unexpected failures

For more details see https://docs.gradle.org/6.3/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)
> Task :compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Could not target platform: 'Java SE 11' using tool chain: 'JDK 8 (1.8)'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.3/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 4m 27s
1 actionable task: 1 executed

[danielduhh]

Hey @stefanocudini , could you verify that the $JAVA_HOME variable (or default java version) on the server is set to jdk11?

[stefanocudini]

yes I have jdk 11:

$ java --version
openjdk 11.0.7 2020-04-14
OpenJDK Runtime Environment (build 11.0.7+10-post-Ubuntu-2ubuntu218.04)

and dir exists:

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

[danielduhh]

Okay... looks like you have java 11 installed, but your $JAVA_HOME default is set to openjdk8; Can you try changing that to your openjdk11 path?

[danielduhh]

Any luck @stefanocudini ?