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Bug 119860

Summary: [evaluation] NPE from watch expression
Product: [Eclipse Project] JDT Reporter: Darin Wright <darin.eclipse>
Component: DebugAssignee: Michael Rennie <Michael_Rennie>
Status: VERIFIED FIXED QA Contact:
Severity: normal    
Priority: P2 CC: daniel_megert, ekuleshov, geziefer, hauser, maxime_daniel, somanchi
Version: 3.2   
Target Milestone: 3.2.1   
Hardware: PC   
OS: Windows XP   
Whiteboard:
Attachments:
Description Flags
patch none

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