Update the way Bamboo sets java.io.tmpdir in Maven tasks

Summary

Maven comes with a library called Jansi. Jansi attempts to extract libraries to a temporary directory by checking jansi.tmpdir. If that property isn't set it attempts to use java.io.tmpdir instead (https://github.com/fusesource/jansi/blob/2cf446182c823a4c110411b765a1f0367eb8a913/src/main/java/org/fusesource/jansi/internal/JansiLoader.java#L79). Jansi is not picking up the java.io.tmpdir that's added to the Maven command by Bamboo because java.io.tmpdir is set as a user property. That property eventually gets promoted to a system property (https://github.com/apache/maven/blob/35b93b0a589752cc88105623a2ddf9e52b56c1ce/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L1783-L1793) but Jansi uses static methods that are run before Maven has a chance to set that promoted property so the files end up going to /tmp.

This won't necessarily break your builds but it may start generating a lot of warnings in your build logs if Jansi is not able to write to the /tmp folder. One reason for that could be if the /tmp directory has been mounted with a noexec flag. For example:

Failed to load native library:jansi-2.4.0-8248ee3780e1fb9a-libjansi.so. The native library file at /tmp/jansi-2.4.0-8248ee3780e1fb9a-libjansi.so is not executable, make sure that the directory is mounted on a partition without the noexec flag, or set the jansi.tmpdir system property to point to a proper location. osinfo: Linux/x86_64
java.lang.UnsatisfiedLinkError: /tmp/jansi-2.4.0-8248ee3780e1fb9a-libjansi.so: /tmp/jansi-2.4.0-8248ee3780e1fb9a-libjansi.so: failed to map segment from shared object

Suggestion

Update the Bamboo Maven task to account for Jansi and a potential change to the Maven code https://github.com/fusesource/jansi/issues/241#issuecomment-1242330210. It looks like Maven will stop promoting user properties to system properties in the near future. This can potentially break the Bamboo Maven task so we need to be prepared for it.

Workaround

One way to workaround the problem within Bamboo is to make use of the MAVEN_OPTS properties in the Maven task's Environment variables field and set it to MAVEN_OPTS=-Djansi.tmpdir=/path/to/tmp. This way you can customize the tmp directory used by Jansi to prevent it from trying to write to /tmp.

• You can also use MAVEN_OPTS=-Djava.io.tmpdir=/path/to/tmp in the Environment variables field but this shouldn't really be necessary (at least for now while Maven is still promoting user properties to system properties) since Maven is picking up the tmp directory correctly. Setting -Djansi.tmpdir should be enough to workaround the problem and get rid of the warning messages in your build logs.