[NETBEANS-955] NPE during background scan or while editing files

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 9.0
• Component/s: java - Compiler
• Labels: NPE

Environment

Product Version = Apache NetBeans IDE Dev (Build incubator-netbeans-release-302-on-20180517)
Operating System = Linux version 4.4.0-128-generic running on amd64
Java; VM; Vendor = 10.0.1; Java HotSpot(TM) 64-Bit Server VM 10.0.1+10; Oracle Corporation
Runtime = Java(TM) SE Runtime Environment 10.0.1+10

• Assignee: Unassigned
• Reporter: Michael Doswald
• Created: 13/Jun/18 08:17
• Updated: 13/Jun/18 08:17

Description

When Netbeans is scanning the sources of my project in background or when I save files in the editor, the following exception happens regurarly. Somtimes it happens so many times, that it is virtually impossible to work with the IDE:

java.lang.NullPointerException
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:575)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:590)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.resolveErrors(VanillaCompileWorker.java:602)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:568)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:590)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.resolveErrors(VanillaCompileWorker.java:600)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:568)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:590)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.resolveErrors(VanillaCompileWorker.java:601)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:568)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:590)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.resolveErrors(VanillaCompileWorker.java:601)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.error2Object(VanillaCompileWorker.java:568)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.visitVariable(VanillaCompileWorker.java:465)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.visitVariable(VanillaCompileWorker.java:458)
    at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:974)
    at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
    at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
    at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
    at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
    at jdk.compiler/com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:187)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.visitClass(VanillaCompileWorker.java:519)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker$3.visitClass(VanillaCompileWorker.java:458)
    at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:808)
    at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
    at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
    at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
    at jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:144)
    at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:591)
    at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
    at org.netbeans.modules.java.source.indexing.VanillaCompileWorker.dropMethodsAndErrors(VanillaCompileWorker.java:605)
[catch] at org.netbeans.modules.java.source.indexing.VanillaCompileWorker.compile(VanillaCompileWorker.java:290)
    at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:275)
    at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:138)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:275)
    at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:136)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2750)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$800(RepositoryUpdater.java:2154)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2636)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2634)
    at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:540)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2634)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5714)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5622)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2127)
    at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2123)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2104)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1500(RepositoryUpdater.java:136)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5749)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5419)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:5038)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3420)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6183)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5834)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6099)
    at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
    at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:83)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6095)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6091)
    at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
    at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
    at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
    at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
    at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6091)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.openide.util.RequestProcessor$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)