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https://issues.apache.org/jira/browse/MNG-5288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15304807#comment-15304807
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ASF GitHub Bot commented on MNG-5288:
-------------------------------------
Github user pono closed the pull request at:
https://github.com/apache/maven/pull/52
> NullPointerException thrown by DefaultExceptionHandler, obscuring underlying
> ProjectBuildingException
> -----------------------------------------------------------------------------------------------------
>
> Key: MNG-5288
> URL: https://issues.apache.org/jira/browse/MNG-5288
> Project: Maven
> Issue Type: Bug
> Components: Errors
> Affects Versions: 3.0.4
> Environment: Linux 2.6.32-5-686
> Reporter: Alex McManus
>
> Running the Maven build with -X, I get the following stack trace from Maven:
> {code}
> [ERROR] Error executing Maven.
> java.lang.NullPointerException
> at
> org.apache.maven.exception.DefaultExceptionHandler.handle(DefaultExceptionHandler.java:104)
> at
> org.apache.maven.exception.DefaultExceptionHandler.handleException(DefaultExceptionHandler.java:89)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:553)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
> {code}
> The underlying problem in my build is a custom plugin that fails to resolve
> an artifact. I can solve this, but clearly NPEs in Maven's error handling
> code is not good. I can see the original exception by putting in an explicit
> try-catch in the plugin:
> {code}
> org.apache.maven.project.ProjectBuildingException: Error resolving project
> artifact: Could not find artifact
> org.oclc.merlins.service-directory:service-directory-api:pom:1.16.0 for
> project org.oclc.merlins.service-directory:service-directory-api:pom:1.16.0
> at
> org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:296)
> at
> org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:267)
> at org.apache.maven.project.ProjectBuilder$build.call(Unknown Source)
> at
> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
> at
> org.oclc.build.tools.mojo.MavenContext.getMavenContext(MavenContext.groovy:374)
> at org.oclc.build.tools.mojo.MavenContext$getMavenContext.call(Unknown
> Source)
> at
> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
> at
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
> at
> org.oclc.build.tools.api.plugin.check.CheckApiMojo.execute(CheckApiMojo.groovy:120)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> 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:84)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
> Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Could
> not find artifact
> org.oclc.merlins.service-directory:service-directory-api:pom:1.16.0
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:538)
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216)
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:193)
> at
> org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:286)
> at
> org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:285)
> ... 32 more
> Caused by: org.sonatype.aether.transfer.ArtifactNotFoundException: Could not
> find artifact
> org.oclc.merlins.service-directory:service-directory-api:pom:1.16.0
> at
> org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:528)
> ... 36 more
> {code}
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