[jboss-jira] [JBoss JIRA] (JBASMP-61) NoClassDefFoundError in shutdown hook

[James Perkins (JIRA)]

    [ https://issues.jboss.org/browse/JBASMP-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12945067#comment-12945067 ] 

James Perkins commented on JBASMP-61:
-------------------------------------

Could anyone experiencing this issue also test the patch linked? I don't have the laptop that I could occasionally reproduce the issue with anymore. If it works, I'll merge it at last as a temporary fix.
                
> NoClassDefFoundError in shutdown hook
> -------------------------------------
>
>                 Key: JBASMP-61
>                 URL: https://issues.jboss.org/browse/JBASMP-61
>             Project: JBoss AS Maven Plugins
>          Issue Type: Bug
>    Affects Versions: 7.5.Final
>         Environment: Maven 3.1.1, Oracle JDK 1.7.0_45.
>            Reporter: Vlad Arkhipov
>            Assignee: James Perkins
>
> {code}  <build>
>     <plugins>
>       <plugin>
>         <groupId>org.jboss.as.plugins</groupId>
>         <artifactId>jboss-as-maven-plugin</artifactId>
>         <version>7.5.Final</version>
>         <executions>
>           <execution>
>             <id>start-jboss</id>
>             <goals>
>               <goal>start</goal>
>             </goals>
>             <phase>package</phase>
>             <configuration>
>               <jbossHome>/home/user/jboss</jbossHome>
>             </configuration>
>           </execution>
>         </executions>
>       </plugin>
>     </plugins>
>   </build>{code}
> If jbossHome is specified, the following exception occurs
> {code}Exception in thread "Thread-2" java.lang.NoClassDefFoundError: org/jboss/as/plugin/common/IoUtils
> 	at org.jboss.as.plugin.server.StandaloneServer.stopServer(StandaloneServer.java:77)
> 	at org.jboss.as.plugin.server.Server.stop(Server.java:108)
> 	at org.jboss.as.plugin.server.SecurityActions$1.run(SecurityActions.java:41)
> 	at java.lang.Thread.run(Thread.java:724)
> Caused by: java.lang.ClassNotFoundException: org.jboss.as.plugin.common.IoUtils
> 	at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
> 	at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
> 	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:235)
> 	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227){code}
> The reason is that in the shutdown hook the class loader is already closed by Maven and cannot be used to load new classes. DefaultPlexusContainer.dispose() disposes plugins' ClassRealms and closes associated URLClassLoaders (if Java version is 7+).
> {code}ClassRealm(URLClassLoader).close() line: 282	
> ClassWorld.closeIfJava7(ClassRealm) line: 113	
> ClassWorld.disposeRealm(String) line: 97	
> DefaultPluginRealmCache.flush() line: 189	
> DefaultPluginRealmCache.dispose() line: 216	
> PlexusLifecycleManager.dispose(Disposable) line: 408	
> PlexusLifecycleManager.unmanage() line: 193	
> DefaultPlexusContainer.dispose() line: 586	
> MavenCli.doMain(MavenCli$CliRequest) line: 241	
> MavenCli.main(String[], ClassWorld) line: 158	{code}
> As a temporary workaround you can either preload IoUtils class somewhere before Maven shutdowns (which is brittle) or "respawn" the current classloader in shutdown hook (which is hacky and brittle too).
> Shutdown hooks should be avoided in plugins as Maven documentation says:
> http://maven.apache.org/plugin-developers/common-bugs.html#Using_Shutdown_Hooks.
> But it seems there is currently no way to handle Maven shutdown event in a plugin, isn't it?

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