Peter Nabbefeld created NETBEANS-885:
----------------------------------------
Summary: NPE on invalid Java source code
Key: NETBEANS-885
URL: https://issues.apache.org/jira/browse/NETBEANS-885
Project: NetBeans
Issue Type: Bug
Affects Versions: 9.0
Environment: Linux, NetBeans 9.0 RC1 (and predecessors).
Reporter: Peter Nabbefeld
I sometimes like to write some code using hints for completion like this:
package test;
import java.io.File;
public class Test {
public void test() {
File[] files = new File[0];
for (file : files)
}
}
This results in NullPointerExceptions on editing, formatting, or even just
re-opening the file.
Additionally to bug resolution I'd like to know how to write tests for such
situations, so I'd be glad if You could append a diff for the changes.
Relevant part of stacktrace:
java.lang.NullPointerException
SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException
at jdk.compiler/com.sun.tools.javac.tree.Pretty.visitVarDef(Pretty.java:636)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:950)
at jdk.compiler/com.sun.tools.javac.tree.Pretty.printExpr(Pretty.java:194)
at jdk.compiler/com.sun.tools.javac.tree.Pretty.printExpr(Pretty.java:209)
at jdk.compiler/com.sun.tools.javac.tree.JCTree.toString(JCTree.java:429)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.createBreadcrumbs(BreadCrumbsNodeImpl.java:260)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:535)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:514)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1026)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:539)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:544)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:514)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:898)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:514)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:503)
at
org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:501)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
at
org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:130)
at
org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:114)
at
org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
at
org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
at
org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
at
org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
at
org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
at
org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
at
org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
at
org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:81)
at
org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:451)
at
org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:422)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.getChildren(BreadCrumbsNodeImpl.java:503)
at
org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.rootAndSelection(BreadCrumbsScanningTask.java:114)
at
org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.run(BreadCrumbsScanningTask.java:82)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:561)
[catch] at
org.netbeans.modules.parsing.impl.TaskProcessor$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$Processor.run(RequestProcessor.java:2033)
SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException
SEVERE [null]: Last record repeated again.
SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException
at jdk.compiler/com.sun.tools.javac.tree.Pretty.visitVarDef(Pretty.java:636)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:950)
at jdk.compiler/com.sun.tools.javac.tree.Pretty.printExpr(Pretty.java:194)
at jdk.compiler/com.sun.tools.javac.tree.Pretty.printExpr(Pretty.java:209)
at jdk.compiler/com.sun.tools.javac.tree.JCTree.toString(JCTree.java:429)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.createBreadcrumbs(BreadCrumbsNodeImpl.java:260)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:535)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:514)
at
jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
at
jdk.compiler/com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1026)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:86)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:539)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:544)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:514)
at
jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:898)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:514)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:503)
at
org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:501)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
at
org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:130)
at
org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:114)
at
org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
at
org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
at
org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
at
org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
at
org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
at
org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
at
org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
at
org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:81)
at
org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:451)
at
org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:422)
at
org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.getChildren(BreadCrumbsNodeImpl.java:503)
at
org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.rootAndSelection(BreadCrumbsScanningTask.java:114)
at
org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.run(BreadCrumbsScanningTask.java:82)
at
org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:561)
[catch] at
org.netbeans.modules.parsing.impl.TaskProcessor$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)
SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException
SEVERE [null]: Last record repeated again.
SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor
org.netbeans.modules.java.editor.imports.ClipboardHandler$7
java.lang.NullPointerException
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to
WARNING [org.netbeans.modules.versioning.util.Utils]: associateEncoding() no
file object available for
/tmp/vcs-1527659156240/vcs-1527660513965/testGenerate123456789.pass
INFO [org.netbeans.modules.parsing.impl.TaskProcessor]: Task:
CancelableTaskWrapper[task:
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask@5cf81cb0, phase:
RESOLVED, priority: 500] : class
org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper
ignored cancel for 99 ms.
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$1 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$2 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$3 ]
WARNING [org.openide.util.WeakListenerImpl]: Can't remove
java.beans.PropertyChangeListener using method
org.netbeans.modules.editor.NbEditorDocument.removePropertyChangeListener from
org.netbeans.modules.editor.NbEditorDocument@7b5f8694, mimeType='text/plain',
kitClass=null, length=343, version=1,
file=org.openide.loaders.DefaultDataObject@3c3c4426[/home/peter/incubator-netbeans/java.editor/test/unit/data/goldenfiles/org/netbeans/modules/java/editor/codegen/DelegateMethodGeneratorTest/1.8/testGenerate133625d.pass@583f1c3d:20e7cfa5]
INFO [org.netbeans.modules.parsing.impl.TaskProcessor]: Task:
CancelableTaskWrapper[task:
org.netbeans.modules.java.hints.spiimpl.hints.HintsTask@319ddcff, phase:
RESOLVED, priority: 500] : class
org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper
ignored cancel for 123 ms.
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$1 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$2 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$3 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$1 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$2 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$3 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$1 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$2 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$3 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$1 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$2 ]
INFO [org.netbeans.api.java.source.ElementHandle]: Resolved type is null for
kind = CLASS
INFO [org.netbeans.api.java.source.ElementHandle]: Cannot resolve:
ElementHandle[kind=CLASS;
sigs=org.netbeans.modules.java.editor.codegen.DelegateMethodGeneratorTest$3 ]
SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException
SEVERE [null]: Last record repeated again.
WARNING [org.netbeans.modules.java.source.tasklist.IncorrectErrorBadges]:
Incorrect error badges detected,
file=/home/peter/NetBeansProjects/SampleExporter/src/main/java/org/example/ds/Test.java.
WARNING [org.netbeans.modules.java.source.tasklist.IncorrectErrorBadges]: Going
to recompute root=/home/peter/NetBeansProjects/SampleExporter/src/main/java,
files in error=[].
WARNING [org.netbeans.modules.java.source.indexing.JavaIndex]:
VanillaCompileWorker caused an exception
Root: /home/peter/NetBeansProjects/SampleExporter/src/main/java
As You can see, not every NPE presents a stacktrace.
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