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    <p>The topic of this question should better be something like: <em>NullPointerException from org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener (Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".</em></p> <p>I am using:</p> <ul> <li><em>JBoss Developer Studio (Core Features) 7.0.1.GA-v20130930-2238-B7 com.jboss.jbds.product.feature.feature.group JBoss by Red Hat</em> <ul> <li>(see Eclipse->Help->About->Installation Details->Installed Software)</li> </ul></li> <li><em>JBossTools Archives Core Plugin 3.4.100.Final-v20130717-0846-B106 (org.jboss.ide.eclipse.archives.core)</em> <ul> <li>(see Eclipse->Help->About->Installation Details->Plug-ins)</li> </ul></li> </ul> <p>I found no final answer, but some points to narrow down the cause a little bit (<strong>uninstalling JBOSS Dev Tools</strong> in Eclipse may likely solve it if they are not needed):</p> <ul> <li><p>there had been a similar bugs fixed, but without further explanation what could have caused it:</p> <ul> <li><p>2009: <a href="https://issues.jboss.org/browse/JBIDE-3538?_sscc=t" rel="nofollow">https://issues.jboss.org/browse/JBIDE-3538?_sscc=t</a></p></li> <li><p>2007: <a href="https://issues.jboss.org/browse/JBIDE-1199?_sscc=t" rel="nofollow">https://issues.jboss.org/browse/JBIDE-1199?_sscc=t</a></p></li> </ul></li> <li><p>2008: here we have some more (plugin-code-related) developer hints: <a href="https://issues.jboss.org/browse/JBIDE-2746?page=com.atlassian.jira.plugin.system.issuetabpanels:changehistory-tabpanel&amp;_sscc=t" rel="nofollow">https://issues.jboss.org/browse/JBIDE-2746?page=com.atlassian.jira.plugin.system.issuetabpanels:changehistory-tabpanel&amp;_sscc=t</a></p> <ul> <li><p><em>forgot to set component</em></p></li> <li><p><em>forgot to close</em></p></li> <li><p><em>NPE when resource = workspace root</em></p></li> </ul></li> <li><p>some of my related exceptions (that seem not to be the cause, but a "problem trigger"):</p> <ul> <li><p><em>AutoBuildJob.doBuild</em>-triggered</p> <pre><code>java.lang.NullPointerException at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener$2.visit(WorkspaceChangeListener.java:74) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49) at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener.resourceChanged(WorkspaceChangeListener.java:70) at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:396) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1531) at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:156) at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) </code></pre></li> <li><p><em>JavaScriptPreferencesManager.createSuspendOnException</em>-triggered</p> <pre><code>java.lang.NullPointerException at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener$2.visit(WorkspaceChangeListener.java:74) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49) at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener.resourceChanged(WorkspaceChangeListener.java:70) at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:396) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1531) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2354) at org.eclipse.debug.core.model.Breakpoint.run(Breakpoint.java:341) at org.eclipse.wst.jsdt.debug.internal.core.breakpoints.JavaScriptExceptionBreakpoint.&lt;init&gt;(JavaScriptExceptionBreakpoint.java:79) at org.eclipse.wst.jsdt.debug.internal.core.JavaScriptPreferencesManager.createSuspendOnException(JavaScriptPreferencesManager.java:168) at org.eclipse.wst.jsdt.debug.internal.core.JavaScriptPreferencesManager.access$2(JavaScriptPreferencesManager.java:166) at org.eclipse.wst.jsdt.debug.internal.core.JavaScriptPreferencesManager$StartJob.run(JavaScriptPreferencesManager.java:80) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) </code></pre></li> <li><p><em>DebugUIPlugin.buildAndLaunch</em>-related/triggered</p> <pre><code>java.lang.NullPointerException at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener$2.visit(WorkspaceChangeListener.java:74) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69) at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49) at org.jboss.ide.eclipse.archives.core.WorkspaceChangeListener.resourceChanged(WorkspaceChangeListener.java:70) at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:396) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1531) at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:532) at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:423) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:830) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:707) at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1018) at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1222) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) </code></pre></li> <li><p>...<code>InternalWorkspaceJob.run</code>...</p></li> <li><p>...<code>at org.jboss.tools.common.model.filesystems.impl.EclipseFileBodySource.write</code>...</p></li> <li><p>...</p></li> </ul></li> </ul>
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    1. POProblems occurred when invoking code from plug-in: "org.eclipse.core.resources"
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    1. USAndreas Dietrich
    1. USAndreas Dietrich
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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