[jira] [Updated] (MNG-7161) Error thrown during uninstalling of JAnsi

["Guillaume Nodet (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MNG-7161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guillaume Nodet updated MNG-7161:
---------------------------------
    Fix Version/s: 4.0.0-alpha-2

> Error thrown during uninstalling of JAnsi
> -----------------------------------------
>
>                 Key: MNG-7161
>                 URL: https://issues.apache.org/jira/browse/MNG-7161
>             Project: Maven
>          Issue Type: Bug
>    Affects Versions: 3.8.2, 4.0.0-alpha-1, 4.0.0
>            Reporter: Guy Brand
>            Assignee: Michael Osipov
>            Priority: Critical
>             Fix For: 3.8.2, 4.0.0-alpha-1, 4.0.0-alpha-2, 4.0.0
>
>
> Our integration tests stopped working after we started to test with a Maven {{4.0.0-alpha-1}} nightly which included this commit: [https://github.com/apache/maven/commit/195fb626a9a4e5a0774f779b6d8da1cb9ef38468#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8R310-R317]
> In this commit the {{maven-shared-utils}} and the {{jansi}} dependencies are being upgraded. When we then run our integration tests we get the following null pointer exception:
> {code:java}
> java.lang.NullPointerException
>   at org.fusesource.jansi.AnsiPrintStream.uninstall(AnsiPrintStream.java:79)
>   at org.fusesource.jansi.AnsiConsole.systemUninstall(AnsiConsole.java:524)
>   at org.apache.maven.shared.utils.logging.MessageUtils.doSystemUninstall(MessageUtils.java:101)
>   at org.apache.maven.shared.utils.logging.MessageUtils.systemUninstall(MessageUtils.java:80)
>   at org.apache.maven.cli.MavenCli.main(MavenCli.java:203)
>   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>   at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.base/java.lang.reflect.Method.invoke(Method.java:566)
>   at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
>   at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
>   at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
>   at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
> {code}
>  
>  We debugged this and [these changes|https://github.com/fusesource/jansi/commit/63bd892b2bdfc253ec119a57bdd42df5e80fd859#diff-d59db8655d9ae2d11948e2b411c34fc9e8513f29065d82c978d7128dafbe3bafR414-R420] in JAnsi introduced in the above upgraded version, is the source of the exception. The NPE is caused because the {{out}} reference is {{null}} at the time it wants to uninstall the {{AnsiOutputStream}}. This reference is nulled because we use the Plexus interactivity library which [disposes the {{DefaultOutputHandler}}|https://github.com/codehaus-plexus/plexus-interactivity/blob/master/plexus-interactivity-api/src/main/java/org/codehaus/plexus/components/interactivity/DefaultOutputHandler.java#L51-L54] on the tear down of Plexus, in which the {{System.out}} reference will be closed which is in fact the {{out}} reference of the {{AnsiConsole}} JAnsi will be [initialized before|https://github.com/apache/maven/blob/3e917677e484067b853eaa4a6de44ebcf5a988de/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L200] the Plexus container). This happens [here|https://github.com/apache/maven/blob/3e917677e484067b853eaa4a6de44ebcf5a988de/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L202], so before JAnsi will be uninstalled in [here|https://github.com/apache/maven/blob/3e917677e484067b853eaa4a6de44ebcf5a988de/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L203].
> There are two options to solve this:
>  1. Report this to JAnsi such that they catch this valid use case and do not throw as this worked without any exceptions in older versions.
>  2. Fix the {{MessageUtils#doSystemUninstall()}} and catch all exceptions and swallow them, as if it can't uninstall it, then Maven itself is not capable of fixing this state either. This is already done in a similar way [here|https://github.com/apache/maven-shared-utils/blob/17091d82508deb9b7067f3434ba16f660ffc5023/src/main/java/org/apache/maven/shared/utils/logging/MessageUtils.java#L85-L92] for removing the shutdown hook.
> Our proposal is to do #2 which would make Maven itself resilient to such use cases as there are other extensions/plugin out there which also retrieve a reference for the system output streams and therefore they would fail with Maven 4.0.0. This would also make this part future proof, as when there are other errors thrown during the uninstall, Maven itself does not break.
> We can as well report this to JAnsi too such that this gets fixed there as well.
>  
> What are your opinions on that?



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