Compatibility with Maven 4?

[reckart]

I have the impression that the p2-layout-resolver may not be compatible with Maven 4. I have been testing Maven 4 on several projects and my feeling is that the main difference between the project where it works and where it doesn't work is the presence of the p2-layout-resolver.

However, the error I get does not have the p2-layout-resolver on its stack trace:

[ERROR] Internal error: java.lang.IllegalArgumentException: Unknown extensible enum value 'xml' -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.IllegalArgumentException: Unknown extensible enum value 'xml'
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:157)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:981)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:291)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:208)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.lang.reflect.Method.invoke(Method.java:580)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:255)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:201)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:361)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:314)
Caused by: java.lang.IllegalArgumentException: Unknown extensible enum value 'xml'
    at org.apache.maven.api.services.ExtensibleEnumRegistry.lambda$require$0(ExtensibleEnumRegistry.java:33)
    at java.util.Optional.orElseThrow(Optional.java:403)
    at org.apache.maven.api.services.ExtensibleEnumRegistry.require(ExtensibleEnumRegistry.java:33)
    at org.apache.maven.internal.impl.DefaultTypeRegistry.lambda$require$1(DefaultTypeRegistry.java:94)
    at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
    at org.apache.maven.internal.impl.DefaultTypeRegistry.require(DefaultTypeRegistry.java:87)
    at org.apache.maven.internal.impl.DefaultTypeRegistry.lookup(DefaultTypeRegistry.java:80)
    at org.apache.maven.internal.impl.DefaultPackagingRegistry.lookup(DefaultPackagingRegistry.java:88)
    at org.apache.maven.internal.impl.model.DefaultLifecycleBindingsInjector.injectLifecycleBindings(DefaultLifecycleBindingsInjector.java:69)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:575)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:198)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.doBuild(DefaultProjectBuilder.java:825)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.lambda$build$6(DefaultProjectBuilder.java:794)
    at java.util.concurrent.FutureTask.run(FutureTask.java:317)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.lang.Thread.run(Thread.java:1583)

and also, I can successfully build the p2-layout-resolver - building the example fails, but not with the error above but rather saying it cannot resolve certain artifacts.

Has anybody tried p2-layout-resolver with Maven 4 (4.0.0-beta-4) or a clue what the error above might be?

[jesse-gallagher]

Hmm, that may very well be the case. I haven't tried Maven 4 yet, but I've been meaning to, and testing this out would certainly be a good impetus to do so.