QuickTip: When Netbeans 6.5 Starts And Freezes Or Becomes Suddenly Slow

It mostly happens when you are playing around with configuration and modules instead of working :-) (like me now). Netbeans opens correctly all windows and freezes. Even restarting does not help. It is caused by deserialization of your last window settings, open views etc. Sometimes (e.g. after installation of a new plugin), Netbeans is no more able to restore the settings, which manifestates in stack trace similar to [./netbeans/var/log/messages.log]:

INFO [org.netbeans.core.windows.persistence]: [PersistenceManager.getTopComponentForID] Problem when deserializing TopComponent for tcID:'MultiView-PageFlow#007CXML#007C'. Reason: java.lang.NoSuchMethodException: org.netbeans.modules.web.jsf.JSFConfigMultiviewDescriptor$JSFConfigMultiviewElement.<init>()

Caused: java.lang.NoSuchMethodException: org.netbeans.modules.web.jsf.JSFConfigMultiviewDescriptor$JSFConfigMultiviewElement.<init>()
    at java.lang.Class.getConstructor0(Class.java:2706)
    at java.lang.Class.getDeclaredConstructor(Class.java:1985)
    at org.openide.windows.TopComponent$Replacer.readObject(TopComponent.java:1469)
Caused: java.io.IOException
    at org.openide.windows.TopComponent$Replacer.readObject(TopComponent.java:1525)
    at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
    at org.netbeans.core.multiview.MultiViewPeer.peerReadExternal(MultiViewPeer.java:442)
    at org.netbeans.core.multiview.MultiViewCloneableTopComponent.readExternal(MultiViewCloneableTopComponent.java:201)
    at org.openide.windows.TopComponent$Replacer.readObject(TopComponent.java:1478)
    at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
    at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.readSerial(XMLSettingsSupport.java:544)
    at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.instanceCreate(XMLSettingsSupport.java:576)
    at org.netbeans.modules.settings.convertors.SerialDataConvertor$SettingsInstance.instanceCreate(SerialDataConvertor.java:420)

The problem can be easily fixed by removing the particular file (MultiView-PageFlow#007CXML#007C.setting in my case), or if you are lazy, all [XYZ].setting files from: .netbeans\6.5\config\Windows2Local\Components. It will have similar effect to the "Reset Window" action.

It happens not very often: exactly 2 times in my case (after the installation of JavaFX and IceFaces extension).