jandex-maven-plugin throws IllegalArgumentException: Comparison method violates its general contract

[mvilliger]

I get the following exception when using jandex-maven-plugin 3.0.4 with Java 11.0.17:

java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeHi (TimSort.java:903)
    at java.util.TimSort.mergeAt (TimSort.java:520)
    at java.util.TimSort.mergeForceCollapse (TimSort.java:461)
    at java.util.TimSort.sort (TimSort.java:254)
    at java.util.Arrays.sort (Arrays.java:1515)
    at java.util.ArrayList.sort (ArrayList.java:1750)
    at org.jboss.jandex.Indexer.propagateTypeParameterBounds (Indexer.java:2422)
    at org.jboss.jandex.Indexer.complete (Indexer.java:2402)
    at org.jboss.jandex.maven.JandexGoal.execute (JandexGoal.java:163)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:370)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
    ...

It seems that this Comparator used in Indexer#propagateTypeParameterBounds does not follow the contract required by java.util.Comparator?

Steps to reproduce:

1. git clone https://github.com/mvilliger/jandex-maven-plugin-iae.git
2. cd jandex-maven-plugin-iae
3. mvn clean verify -e

[mvilliger]

An additional note: It seems to be a regression as the older plugin org.jboss.jandex:jandex-maven-plugin:1.2.3 works fine on the same code base.

[Ladicek]

Okay, that's pretty bad. Thanks for reproducer!

It seems to be a regression as the older plugin org.jboss.jandex:jandex-maven-plugin:1.2.3 works fine on the same code base.

Yeah, Jandex 2.x didn't propagate type annotations across nested classes. That code is new in Jandex 3.

[mvilliger]

Wow, thank you very much for the incredibly fast fix!! 🎉
Do you already know when we could expect a 3.0.5 release to appear on Maven central?

[Ladicek]

I'll release 3.0.5 later today.

[Ladicek]

FYI, 3.0.5 is available in Central now.

[mvilliger]

Thank you very much!
Awesome time to market :)

[mvilliger]

I can confirm the issue is fixed 🎉👌

[Ladicek]

Thank you!