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https://issues.apache.org/jira/browse/MRRESOURCES-101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959543#comment-15959543
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Karl Heinz Marbaise commented on MRRESOURCES-101:
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Hi Daniel, first thanks for your patch...but against which state of the repos
have you made that patch...maybe I mistaken something...
> NPE - Error rendering velocity resource
> ---------------------------------------
>
> Key: MRRESOURCES-101
> URL: https://issues.apache.org/jira/browse/MRRESOURCES-101
> Project: Maven Remote Resources Plugin
> Issue Type: Bug
> Affects Versions: 1.5
> Reporter: Daniel Klessing
> Attachments: mrresources_npe.diff
>
>
> We noticed that occasionally the maven-remote-resources-plugin kills our
> build as a NPE with the message "Error rendering velocity resource" happend.
> Luckily I succeeded today in getting a stacktrace of the issue:
> {code}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process (default)
> on project parent: Error rendering velocity resource. NullPointerException ->
> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process
> (default) on project parent: Error rendering velocity resource.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
> 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:128)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
> 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: Error rendering
> velocity resource.
> at
> org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.processResourceBundles(ProcessRemoteResourcesMojo.java:1246)
> at
> org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.execute(ProcessRemoteResourcesMojo.java:520)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
> ... 20 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.processResourceBundles(ProcessRemoteResourcesMojo.java:1232)
> ... 23 more
> [ERROR]
> [ERROR]
> [ERROR] For more information about the errors and possible solutions, please
> read the following articles:
> [ERROR] [Help 1]
> http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
> {code}
> Looking into the code I noticed that an "unguarded close()" in a
> finally-block is the culprit. By replacing it with a call to
> {{IOUtil.close()}} the problem is gone. See the attached patch/diff.
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