negora opened a new issue, #4627: URL: https://github.com/apache/netbeans/issues/4627
### Apache NetBeans version Apache NetBeans 15 release candidate ### What happened Before the error occurred, I had renamed (by means of refactoring) lots of packages in my project tree. That actions worked fine until this error came up. Now, I can't rename any package. This is occurring in a Java EE project built with Maven (with multiple modules). Specifically, this is happening in the EJB module. If I try to rename a package in the Web module, it still works OK. Although this time the bug has affected the EJB module, I think that the same error has came up in the Web module in the past (in a similar context: massive renaming). The effects have been the same. This is a screenshot of the modal window that appears:  This is the full exception stack trace: ``` SEVERE [org.openide.util.Exceptions] java.lang.NullPointerException: Cannot invoke "org.openide.filesystems.FileObject.isFolder()" because "fo" is null at org.netbeans.modules.refactoring.java.plugins.MoveFileRefactoringPlugin.getTargetPackageName(MoveFileRefactoringPlugin.java:620) at org.netbeans.modules.refactoring.java.plugins.MoveTransformer.getTargetPackageName(MoveTransformer.java:263) at org.netbeans.modules.refactoring.java.plugins.MoveTransformer.visitImport(MoveTransformer.java:406) at org.netbeans.modules.refactoring.java.plugins.MoveTransformer.visitImport(MoveTransformer.java:47) at com.sun.tools.javac.tree.JCTree$JCImport.accept(JCTree.java:683) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86) at org.netbeans.modules.refactoring.java.spi.RefactoringVisitor.scan(RefactoringVisitor.java:193) at org.netbeans.modules.refactoring.java.spi.RefactoringVisitor.scan(RefactoringVisitor.java:77) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:111) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119) at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:151) at org.netbeans.modules.refactoring.java.plugins.MoveTransformer.visitCompilationUnit(MoveTransformer.java:320) at org.netbeans.modules.refactoring.java.plugins.MoveTransformer.visitCompilationUnit(MoveTransformer.java:47) at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:614) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:86) at org.netbeans.modules.refactoring.java.spi.RefactoringVisitor.scan(RefactoringVisitor.java:193) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$TransformTask.run(JavaRefactoringPlugin.java:455) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$TransformTask.run(JavaRefactoringPlugin.java:420) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.lambda$processFiles$1(JavaRefactoringPlugin.java:325) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:675) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:665) at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:504) at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586) at org.netbeans.modules.parsing.api.ParserManager$MultiUserTaskAction.run(ParserManager.java:169) at org.netbeans.modules.parsing.api.ParserManager$MultiUserTaskAction.run(ParserManager.java:140) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335) at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:85) at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:454) at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:425) at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:686) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:323) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:264) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:246) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:338) at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:354) at org.netbeans.modules.refactoring.java.plugins.MoveFileRefactoringPlugin.prepare(MoveFileRefactoringPlugin.java:576) [catch] at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:417) at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:401) at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:212) at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:1063) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033) ``` ### How to reproduce I've tried hard but have not been able to reproduce this error yet. I only know that this usually happens when I do a massive renaming of packages and classes. I don't know what triggers it. ### Did this work correctly in an earlier version? Apache NetBeans 12.3 or earlier ### Operating System Debian GNU/Linux 11.5 (Bullseye) ### JDK OpenJDK Runtime Environment (build 17.0.4+8-Debian-1deb11u1) ### Apache NetBeans packaging Apache NetBeans binary zip ### Anything else These are the plug-ins that I've in my install: * Color Codes Preview * JavaFX Implementation for Linux * NetBeans Case Converter * QuickOpener ### Are you willing to submit a pull request? No ### Code of Conduct Yes -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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