NPE with bnd-baseline-maven-plugin

[Simon Chemouil]

Hi,

I'm trying to get the bnd-baseline-maven-plugin plugin working, but I get the following NPE: An error occurred while calculating the baseline: NullPointerException 

A quick glance at the stacktrace shows the NPE happens in a Maven component, Aether, in class DefaultVersionResolver, where "VersionRequest" seems to be null (that would imply a problem with the invocation by bnd-baseline-maven-plugin ?).

I have an existing release in Maven Central I'd like to use as my baseline. I have a log in Maven debug mode showing the right version (1.0.0) is found. Setting it explicitly with the <base/> coordinates does not fix the issue:

<plugin>

<groupId>biz.aQute.bnd</groupId>

<artifactId>bnd-baseline-maven-plugin</artifactId>

<configuration>

<base>

<groupId>${project.groupId}</groupId>

<artifactId>${project.artifactId}</artifactId>

<version>1.0.0</version>

</base>

<continueOnError>false</continueOnError>

<fullReport>true</fullReport>

</configuration>

</plugin>

Any help is much appreciated!

Below the error I get:

[DEBUG] Baselining against Base [groupId=io.primeval, artifactId=primeval-commons, version=null, classifier=, extension=jar], fail on missing: true

[INFO] Automatically determining the baseline version for io.primeval:primeval-commons:jar:1.1.0-SNAPSHOT using repositories [null, nexus (http://172.17.10.31:8081/nexus/content/groups/public/, releases+snapshots)]

[DEBUG] Skipped remote update check for io.primeval:primeval-commons/maven-metadata.xml, locally cached metadata up-to-date.

[DEBUG] Found versions [1.0.0-SNAPSHOT, 1.0.0]

[INFO] The baseline version was found to be 1.0.0

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 2.385 s

[INFO] Finished at: 2017-04-28T17:58:06+02:00

[INFO] Final Memory: 16M/205M

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal biz.aQute.bnd:bnd-baseline-maven-plugin:3.3.0:baseline (baseline) on project primeval-commons: An error occurred while calculating the baseline: NullPointerException -> [Help 1]

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal biz.aQute.bnd:bnd-baseline-maven-plugin:3.3.0:baseline (baseline) on project primeval-commons: An error occurred while calculating the baseline

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)

at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347)

at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)

at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)

at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)

at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)

at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

Caused by: org.apache.maven.plugin.MojoExecutionException: An error occurred while calculating the baseline

at aQute.bnd.maven.baseline.plugin.BaselineMojo.execute(BaselineMojo.java:123)

at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)

... 19 more

Caused by: java.lang.NullPointerException

at org.apache.maven.repository.internal.DefaultVersionResolver$Key.<init>(DefaultVersionResolver.java:559)

at org.apache.maven.repository.internal.DefaultVersionResolver.resolveVersion(DefaultVersionResolver.java:183)

at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:318)

at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:262)

at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:239)

at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:295)

at aQute.bnd.maven.baseline.plugin.BaselineMojo.locateBaseJar(BaselineMojo.java:193)

at aQute.bnd.maven.baseline.plugin.BaselineMojo.execute(BaselineMojo.java:89)

... 21 more

[BJ Hargrave]

You do not mention what version of the bnd-baseline-maven-plugin you are using. That have been significant changes in the 3.4.0 snapshot builds. Perhaps you can try the latest snapshot?

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[Simon Chemouil]

I am using 3.3.0 for both bnd-maven-plugin & bnd-baseline-maven-plugin. I'll give 3.4.0-SNAPSHOT a try.

[Simon Chemouil]

I took some time to try with 3.4.0-SNAPSHOT and it's no better. Exactly same issue.

I'm not doing anything fancy: my baseline artifact is found on Central.

Maybe someone who uses it successfully on a Maven project can point me to the right direction? In the mean time I'm going to debug it and see if I can fix the bug.

Simon

[Simon Chemouil]

Le vendredi 12 mai 2017 10:09:01 UTC+2, Simon Chemouil a écrit :

Maybe someone who uses it successfully on a Maven project can point me to the right direction? In the mean time I'm going to debug it and see if I can fix the bug.

OK, I found and fixed the issue.

My projects don't use <distributionManagement/> (because I find it evil) and bnd-baseline-maven-plugin tries to use it by default, unless a property bnd.baseline.include.distribution.management is explicitly set to false using:

<properties>

<bnd.baseline.include.distribution.management>false</bnd.baseline.include.distribution.management>

</properties>

I believe there is still a bug in the plugin, BaselineMojo's List<RemoteRepository> getRepositories(Artifact) method which should check if the project's distributionManagement is null before adding it to the repository list. I'll provide a fix.

Simon