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See 2133 (the same behavior) java.io.StreamCorruptedException: Caught EOFException while reading the stream header at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:727) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:165) at org.openide.loaders.InstanceSupport$1$OIS.<init>(InstanceSupport.java:372) at org.openide.loaders.InstanceSupport.readClass(InstanceSupport.java:383) at org.openide.loaders.InstanceSupport.instanceClass(InstanceSupport.java:104) at com.netbeans.developer.modules.loaders.clazz.ClassDataObject.initCookies(ClassDataObject.java:103) at com.netbeans.developer.modules.loaders.clazz.ClassDataObject.getCookie(ClassDataObject.java:122) at com.netbeans.developer.modules.loaders.clazz.ClassDataNode.initialize(ClassDataNode.java:102) at com.netbeans.developer.modules.loaders.clazz.ClassDataNode.<init>(ClassDataNode.java:87) at com.netbeans.developer.modules.loaders.clazz.SerDataNode.<init>(SerDataNode.java:48) at com.netbeans.developer.modules.loaders.clazz.SerDataObject.createNodeDelegate(SerDataObject.java:58) at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:231) at org.openide.loaders.DataObject.getClonedNodeDelegate(DataObject.java:245) at org.openide.loaders.FolderChildren.createNodes(FolderChildren.java:113) at org.openide.nodes.Children$1$Updator.run(Children.java:1209) at org.openide.util.Mutex.doEvent(Mutex.java:455) at org.openide.util.Mutex.writeAccess(Mutex.java:240) at org.openide.nodes.Children$Keys.setKeys(Children.java:1302) at org.openide.loaders.FolderChildren.refreshChildren(FolderChildren.java:98) at org.openide.loaders.FolderChildren.propertyChange(FolderChildren.java:64) at org.openide.util.WeakListener$PropertyChange.propertyChange(WeakListener.java:122) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:156) at org.openide.loaders.DataObject.firePropertyChange(DataObject.java:682) at