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This bug was originally marked as duplicate of bug 204836, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.4 Beta (Build 201307092200) VM: Java HotSpot(TM) Client VM, 23.21-b01, Java(TM) SE Runtime Environment, 1.7.0_21-b11 OS: Windows 7 User Comments: aldobrucale: Deleting a class kawazu428: tried to delete a java class GUEST: unknown error Stacktrace: java.lang.NullPointerException at org.netbeans.modules.refactoring.java.plugins.SafeDeleteRefactoringPlugin.prepare(SafeDeleteRefactoringPlugin.java:118) at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:437) at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:421) at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:232) at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:1020) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
Created attachment 140378 [details] stacktrace
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss