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This bug was originally marked as duplicate of bug 190319, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.0 Beta (Build nbms-and-javadoc-6566-on-110129) VM: Java HotSpot(TM) 64-Bit Server VM, 17.1-b03-307, Java(TM) SE Runtime Environment, 1.6.0_22-b04-307-10M3261 OS: Mac OS X User Comments: GUEST: create a new web application with tomcat as server t_yano: it was occured at launching. Stacktrace: java.lang.AssertionError: FileName: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/ui.jar@84fc04d fo: MasterFileObject[/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/ui.jar@761b5baf:2bda037e,valid=true] at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.getChildren(FolderObj.java:150) at org.openide.filesystems.FileUtil$Holder.locateCurrent(FileUtil.java:428) at org.openide.filesystems.FileUtil$Holder.<init>(FileUtil.java:403) at org.openide.filesystems.FileUtil.addFileChangeListener(FileUtil.java:281) at org.netbeans.api.java.classpath.ClassPath$RootsListener.addRoots(ClassPath.java:1118) at org.netbeans.api.java.classpath.ClassPath.createRoots(ClassPath.java:291)
Created attachment 105507 [details] stacktrace
I also have seen this issue many times - under many different scenarios. Sometimes i happens on startup when scanning many projects(Maven based) that I have open. Due to this bug, some classes are reported as uncompilable. When I open them, I see the same error trace again popup in a dialog box.
Only reported twice and the latest report is 8 months old, so presumably this was resolved by some other fix. If this still happens to you, please reopen.