Build Issue: :elki-logging:compileJava - NullPointerException about elki HOT 4 CLOSED

Clearly this is an error in Gradle, not in ELKI.

My guess is that you did not install a Java JDK, and hence your docker container cannot compile Java.

Try using a JDK container, not a JRE container. i.e., try

FROM gradle:7.1-jdk11

not jre.

If that resolves the issue, please file a bug with gradle to provide a more helpful error message (e.g., "no JDK installed") instead of a NPE.

from elki.

@kno10 Thanks, that ... I feel ashamed now :S

from elki.

It's not your fault. Gradle should provide a better error message instead of

java.lang.NullPointerException (no error message)

from elki.

FYI: the next version of Gradle should report "Java compiler is not available." via gradle/gradle/pull/17617

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