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https://issues.apache.org/jira/browse/CXF-5287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770631#comment-13770631
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Nickolay Martinov commented on CXF-5287:
----------------------------------------
Ok, the issue is that there is exception in try block of execute() and during
the cleanup in finally we throw another exception. In fact, switch is inside
try but release that does cleanup in finally is not prepared for partially
constructed state.
> NPE at org.apache.cxf.maven_plugin.ClassLoaderSwitcher.restoreClassLoader
> -------------------------------------------------------------------------
>
> Key: CXF-5287
> URL: https://issues.apache.org/jira/browse/CXF-5287
> Project: CXF
> Issue Type: Bug
> Components: Tooling
> Affects Versions: 2.7.6
> Reporter: Nickolay Martinov
> Priority: Blocker
> Attachments: CXF-5287-fix.patch
>
>
> Maven plugin throws exception when running build.
> {noformat}
> Failed to execute goal org.apache.cxf:cxf-java2ws-plugin:2.7.6:java2ws
> (Generate UtafService.wsdl) on project temip-ca-alarms-from-temip-utaf-bc:
> Execution Generate UtafService.wsdl of goal
> org.apache.cxf:cxf-java2ws-plugin:2.7.6:java2ws failed. NullPointerException
> -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal org.apache.cxf:cxf-java2ws-plugin:2.7.6:java2ws (Generate
> UtafService.wsdl) on project temip-ca-alarms-from-temip-utaf-bc: Execution
> Generate UtafService.wsdl of goal
> org.apache.cxf:cxf-java2ws-plugin:2.7.6:java2ws failed.
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
> 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.apache.maven.plugin.PluginExecutionException: Execution
> Generate UtafService.wsdl of goal
> org.apache.cxf:cxf-java2ws-plugin:2.7.6:java2ws failed.
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> ... 19 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.cxf.maven_plugin.ClassLoaderSwitcher.restoreClassLoader(ClassLoaderSwitcher.java:120)
> at org.apache.cxf.maven_plugin.Java2WSMojo.execute(Java2WSMojo.java:233)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
> ... 20 more
> {noformat}
> According to source it fails when it tries to restore system properties. This
> can only happen when switchClassLoader() was never called.
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