Bug 119860 - [evaluation] NPE from watch expression
Summary: [evaluation] NPE from watch expression
Status: VERIFIED FIXED
Alias: None
Product: JDT
Classification: Eclipse Project
Component: Debug (show other bugs)
Version: 3.2   Edit
Hardware: PC Windows XP
: P2 normal (vote)
Target Milestone: 3.2.1   Edit
Assignee: Michael Rennie CLA
QA Contact:
URL:
Whiteboard:
Keywords:
: 105169 140637 151244 154656 (view as bug list)
Depends on:
Blocks:
 
Reported: 2005-12-08 08:48 EST by Darin Wright CLA
Modified: 2009-05-23 10:07 EDT (History)
6 users (show)

See Also:

Attachments
patch (1.64 KB, patch)
2006-06-07 16:48 EDT, Darin Wright CLA 		no flags Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Darin Wright CLA 2005-12-08 08:48:18 EST 
Added watch expression "fName.length()" and debugged junit.samples.VectorTest to breakpoint in testCapacity().

Got following NPE:

java.lang.NullPointerException
	at org.eclipse.jdt.internal.debug.eval.ast.engine.ASTInstructionCompiler.containsALocalType(ASTInstructionCompiler.java:376)
	at org.eclipse.jdt.internal.debug.eval.ast.engine.ASTInstructionCompiler.visit(ASTInstructionCompiler.java:2670)
	at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:236)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
	at org.eclipse.jdt.core.dom.ReturnStatement.accept0(ReturnStatement.java:135)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
	at org.eclipse.jdt.core.dom.Block.accept0(Block.java:135)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
	at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:501)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
	at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:483)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
	at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:212)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
	at org.eclipse.jdt.internal.debug.eval.ast.engine.ASTEvaluationEngine.createExpressionFromAST(ASTEvaluationEngine.java:389)
	at org.eclipse.jdt.internal.debug.eval.ast.engine.ASTEvaluationEngine.getCompiledExpression(ASTEvaluationEngine.java:204)
	at org.eclipse.jdt.internal.debug.eval.ast.engine.ASTEvaluationEngine.evaluate(ASTEvaluationEngine.java:89)
	at org.eclipse.jdt.internal.debug.ui.JavaWatchExpressionDelegate$EvaluationRunnable.run(JavaWatchExpressionDelegate.java:144)
	at org.eclipse.jdt.internal.debug.core.model.JDIThread$ThreadJob.run(JDIThread.java:2448)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)
Comment 1 Darin Wright CLA 2006-04-04 16:42:10 EDT 
*** Bug 105169 has been marked as a duplicate of this bug. ***
Comment 2 Michael Rennie CLA 2006-04-17 15:30:39 EDT 
for some reason the method binding being passed in is null....this one will take alot more effort and digging than allowed for the remainder or the RC's.
Comment 3 Darin Wright CLA 2006-04-17 22:17:44 EDT 
I'll take a look at this one... I've got some ideas.
Comment 4 Darin Wright CLA 2006-04-26 18:41:38 EDT 
Seems to be caused by the fact the fName is a private field access that is not visible from the receiving object that the expression is compiled in.
Comment 5 Darin Wright CLA 2006-05-02 14:31:14 EDT 
Same problem existed in 3.1. Marking as later as this is not a regression. The best fix would be to propogate the compilation error to the user - i.e. fName is not visible.
Comment 6 Darin Wright CLA 2006-05-08 15:05:55 EDT 
*** Bug 140637 has been marked as a duplicate of this bug. ***
Comment 7 Darin Wright CLA 2006-05-08 15:06:12 EDT 
Marking as 3.3
Comment 8 Darin Wright CLA 2006-05-31 17:10:01 EDT 
Investigate for 3.2.1
Comment 9 Darin Wright CLA 2006-06-07 16:48:55 EDT 
Created attachment 43794 [details]
patch

Patch reports the error to the user when unable to resolve a method binding.
Comment 10 Darin Wright CLA 2006-06-08 17:00:55 EDT 
Released to TARGET_321 branch
Comment 11 Darin Wright CLA 2006-06-09 09:29:46 EDT 
Released to HEAD
Comment 12 Darin Wright CLA 2006-07-06 11:46:45 EDT 
Released to R3_2_maintenance branch
Comment 13 Darin Wright CLA 2006-07-06 11:46:58 EDT 
Please verify, Mike.
Comment 14 Michael Rennie CLA 2006-07-06 12:40:08 EDT 
verified
Comment 15 Darin Wright CLA 2006-07-27 16:19:34 EDT 
*** Bug 151244 has been marked as a duplicate of this bug. ***
Comment 16 Darin Wright CLA 2006-08-28 11:37:38 EDT 
*** Bug 154656 has been marked as a duplicate of this bug. ***
Comment 17 Ralf Hauser CLA 2009-05-23 10:07:13 EDT 
see also Bug 277574