Enrico Olivelli created NETBEANS-814:
----------------------------------------
Summary: NullPointerException while editing Java file
Key: NETBEANS-814
URL: https://issues.apache.org/jira/browse/NETBEANS-814
Project: NetBeans
Issue Type: Bug
Affects Versions: 9.0
Environment: Linux Fedora 27
NetBeans 9 RC1
NetBeans running on Java 10 without nb-javac
Java Maven Project with source version 1.8
Reporter: Enrico Olivelli
I periodically get this error while having a Java file opened in the editor.
I did not find a duplicate in JIRA
{code:java}
java.lang.NullPointerException
at
jdk.compiler/com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:386)
at
jdk.compiler/com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:163)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker$VariablesVisitor.isLocalVariable(PreconditionsChecker.java:226)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker$VariablesVisitor.visitIdentifier(PreconditionsChecker.java:218)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker$VariablesVisitor.visitIdentifier(PreconditionsChecker.java:192)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2251)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitVariable(TreeScanner.java:221)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker$VariablesVisitor.visitVariable(PreconditionsChecker.java:213)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker$VariablesVisitor.visitVariable(PreconditionsChecker.java:192)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:974)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.ErrorAwareTreeScanner.visitErroneous(ErrorAwareTreeScanner.java:32)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCErroneous.accept(JCTree.java:2927)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitExpressionStatement(TreeScanner.java:433)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1460)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitIf(TreeScanner.java:419)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1433)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitIf(TreeScanner.java:419)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1433)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitEnhancedForLoop(TreeScanner.java:306)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1172)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker.getInnerVariables(PreconditionsChecker.java:90)
at
org.netbeans.modules.java.hints.jdk.mapreduce.PreconditionsChecker.<init>(PreconditionsChecker.java:75)
at
org.netbeans.modules.java.hints.jdk.mapreduce.ForLoopToFunctionalHint.computeWarning(ForLoopToFunctionalHint.java:55)
at jdk.internal.reflect.GeneratedMethodAccessor170.invoke(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
[catch] at
org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:317)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:798)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.access$400(HintsInvoker.java:90)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.runAndAdd(HintsInvoker.java:657)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:676)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
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
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitTry(TreeScanner.java:374)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCTry.accept(JCTree.java:1328)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:206)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:898)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
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
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
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
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:808)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:69)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:682)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:610)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:78)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:144)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:591)
at
jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:56)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:701)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:245)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:228)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:193)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:166)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:128)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:114)
at
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:65)
at
org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:273)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:561)
at
org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:786)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
at
org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:702)
at
org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:663)
at
java.base/java.util.concurrent.Executors$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)
{code}
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