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https://issues.apache.org/jira/browse/NETBEANS-735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817805#comment-16817805
 ] 

Anthony Vanelverdinghe commented on NETBEANS-735:
-------------------------------------------------

The bug is pretty obvious: 
[GraphNode::getDuplicatesOrConflicts|https://github.com/apache/incubator-netbeans/blob/master/java/java.graph/src/org/netbeans/modules/java/graph/GraphNode.java#L76]
 returns an unmodifiableSet, while  
[MavenAction::updateGraphAfterExclusion|https://github.com/apache/incubator-netbeans/blob/master/java/maven.graph/src/org/netbeans/modules/maven/graph/MavenAction.java#L167]
 invokes "removeAll" on it.

> Exception is thrown when excluding an artefact from within the Maven Graph
> --------------------------------------------------------------------------
>
>                 Key: NETBEANS-735
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-735
>             Project: NetBeans
>          Issue Type: Bug
>          Components: projects - Maven
>    Affects Versions: 9.0
>         Environment: Product Version: Apache NetBeans IDE Dev (Build 
> incubator-netbeans-release-277-on-20180425)
> Java: 10.0.1; Java HotSpot(TM) 64-Bit Server VM 10.0.1+10
> Runtime: Java(TM) SE Runtime Environment 10.0.1+10
> System: Windows 10 version 10.0 running on amd64; Cp1252; en_DE (nb)
>            Reporter: Thomas Kellerer
>            Priority: Major
>
> When displaying the dependency graph of a Maven based project and then 
> excluding an artefact by right-clicking on it and choosing "Exclude" the 
> following exception is thrown:
>  
> {noformat}
> java.lang.UnsupportedOperationException
>     at 
> java.base/java.util.Collections$UnmodifiableCollection.removeAll(Collections.java:1069)
>     at 
> org.netbeans.modules.maven.graph.MavenAction.updateGraphAfterExclusion(MavenAction.java:167)
>     at 
> org.netbeans.modules.maven.graph.ExcludeDepAction.actionPerformed(ExcludeDepAction.java:77)
>     at 
> java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
>     at 
> java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
>     at 
> java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
>     at 
> java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
>     at 
> java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:369)
>     at 
> java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:980)
>     at 
> java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1024)
>     at 
> java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
>     at java.desktop/java.awt.Component.processMouseEvent(Component.java:6589)
>     at 
> java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
>     at java.desktop/java.awt.Component.processEvent(Component.java:6354)
>     at java.desktop/java.awt.Container.processEvent(Container.java:2261)
>     at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4966)
>     at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319)
>     at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
>     at 
> java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4914)
>     at 
> java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4543)
>     at 
> java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4484)
>     at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2305)
>     at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
>     at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
>     at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
>     at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
>     at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
>     at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
>     at java.base/java.security.AccessController.doPrivileged(Native Method)
>     at 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
>     at 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
>     at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
>     at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
>     at java.base/java.security.AccessController.doPrivileged(Native Method)
>     at 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
>     at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
>     at 
> org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
> [catch] at 
> java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
>     at 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
>     at 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
>     at 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
>     at 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
>     at 
> java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
> {noformat}
> The POM is updated nevertheless.



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