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Bug 106787 - NullPointer occurs when setting block comments and source has errors and
Summary: NullPointer occurs when setting block comments and source has errors and
Status: RESOLVED FIXED
Alias: None
Product: java
Classification: Unclassified
Component: Unsupported (show other bugs)
Version: 6.x
Hardware: PC All
: P3 blocker (vote)
Assignee: issues@java
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-06-15 11:33 UTC by John Baker
Modified: 2007-09-26 09:14 UTC (History)
0 users

See Also:
Issue Type: DEFECT
Exception Reporter:

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Description John Baker 2007-06-15 11:33:45 UTC 
There are syntax error in my Java source.

On lines other than the ones with syntax errors, I clicked and dragged the mouse
to select multiple lines, then click the Comment toolbar button to comment out the lines selected.

As a result, NullPointer occurred:

java.lang.NullPointerException
	at org.netbeans.modules.java.hints.IllegalInstanceOf.run(IllegalInstanceOf.java:60)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.runAndAdd(HintsTask.java:92)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:110)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.visitParenthesized(TreeScanner.java:272)
	at com.sun.tools.javac.tree.JCTree$JCParens.accept(JCTree.java:1330)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.visitIf(TreeScanner.java:216)
	at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1062)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:143)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:752)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:127)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:664)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:117)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:596)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:117)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:596)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:117)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:596)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:117)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:596)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:104)
	at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:476)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:116)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask$ScannerImpl.scan(HintsTask.java:68)
	at org.netbeans.modules.java.editor.semantic.ScanningCancellableTask.scan(ScanningCancellableTask.java:74)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask.run(HintsTask.java:60)
	at org.netbeans.modules.java.hints.infrastructure.HintsTask.run(HintsTask.java:43)
	at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1439)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
[catch] at java.lang.Thread.run(Thread.java:619)
Comment 1 Jan Lahoda 2007-06-15 11:36:32 UTC 
A very similar problem has been fixed recently, so closing as fixed. Please reopen if it happens on an up to date build.
Thanks.
Comment 2 John Baker 2007-06-15 11:47:49 UTC 
commenting out the lines may not have been the cause. Any focus of the Editor popped up the NullPointer exception dialog

I had an extra closing brace in my class that caused syntax errors.

e.g. (notice the extra closing brace after the myFirstMethod)

public class MyClass {

   private void myFirstMethod() {
       String[] stringArray = {"hello", "world"};
   
       for (int i = 0; i < stringArray.length; i++) {
           String s = stringArray[i];
       }
       }
    }

    private void mySecondMethod() {
       String[] stringArray = {"hello", "world"};
   
       for (int i = 0; i < stringArray.length; i++) {
           String s = stringArray[i];
       }
       
    }
}