Bug 19433

Summary:	NPE in ReferenceTypeImpl.fields
Product:	[Eclipse Project] JDT	Reporter:	Peter Burka <peter_burka>
Component:	Debug	Assignee:	Darin Wright <darin.eclipse>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	P3	CC:	jed.anderson
Version:	2.0
Target Milestone:	2.1 M2
Hardware:	PC
OS:	Windows XP
Whiteboard:

Description Peter Burka

2002-06-05 18:31:41 EDT

Build F2

My runtime workbench was stopped in the debugger.

I saw this exception appear on the console when I started editing the static 
method in which the code was stopped.

java.lang.NullPointerException

Stack trace:
   java/lang/Throwable.<init>()V
   java/lang/Throwable.<init>(Ljava/lang/String;)V
   java/lang/NullPointerException.<init>(Ljava/lang/String;)V
   org/eclipse/jdi/internal/ReferenceTypeImpl.fields()Ljava/util/List;
   org/eclipse/jdi/internal/ReferenceTypeImpl.allFields()Ljava/util/List;
   org/eclipse/jdt/internal/debug/core/model/JDIStackFrame.getVariables0()
Ljava/util/List;
   org/eclipse/jdt/internal/debug/core/model/JDIStackFrame.findVariable
(Ljava/lang/String;)Lorg/eclipse/jdt/debug/core/IJavaVariable;
   org/eclipse/jdt/internal/debug/core/model/JDIThread.findVariable
(Ljava/lang/String;)Lorg/eclipse/jdt/debug/core/IJavaVariable;
   org/eclipse/jdt/internal/debug/core/model/JDIDebugTarget.findVariable
(Ljava/lang/String;)Lorg/eclipse/jdt/debug/core/IJavaVariable;
   org/eclipse/jdt/internal/debug/ui/JavaDebugHover.getHoverInfo
(Lorg/eclipse/jface/text/ITextViewer;Lorg/eclipse/jface/text/IRegion;)
Ljava/lang/String;
   org/eclipse/jdt/internal/ui/text/java/hover/JavaTextHover.getHoverInfo
(Lorg/eclipse/jface/text/ITextViewer;Lorg/eclipse/jface/text/IRegion;)
Ljava/lang/String;
   org/eclipse/jface/text/TextViewerHoverManager$2.run()V

Comment 1 Peter Burka

2002-06-05 18:32:39 EDT

Other info -

I had an object expanded to two levels in the variables view

The details pane was visible

Comment 2 Jared Burns

2002-06-07 16:33:18 EDT

Don't suppose you can reproduce this on a VM which prints line numbers in the 
stack trace? It's really much more difficult to figure these things out 
without line numbers.

Comment 3 Jared Burns

2002-06-10 14:44:47 EDT

Looking at the code, there appears to be only one place that this NPE can 
occur - line 540:
  JdwpReplyPacket replyPacket = requestVM(JdwpCommandPacket.RT_FIELDS, 
this);
  defaultReplyErrorHandler(replyPacket.errorCode());

The requestVM() will return null if the communication between the Debugger 
and the VM is interrupted. @see 
PacketReceiveManager#getReply(JdwpCommandPacket commandPacket)

Our JDI client never handles a null replyPacket. However, we've never seen 
a null replyPacket before, so it appears that this case is our extremely 
rare. Recommend deferring for post 2.0 review.

Comment 4 Jared Burns

2002-06-11 13:47:44 EDT

*** Bug 19155 has been marked as a duplicate of this bug. ***

Comment 5 Darin Wright

2002-06-13 14:47:42 EDT

Agreed. Deferred for post 2.0 consideration.

The JDI client looks like it has to be interrupted for this problem to happen, 
and this is the first we have seen of it. It looks like we should be throwing a 
runtime JDI exception when this happens.

Comment 6 Darin Wright

2002-08-01 14:22:15 EDT

Re-opening for 2.1

Comment 7 Darin Wright

2002-08-28 14:13:09 EDT

*** Bug 22955 has been marked as a duplicate of this bug. ***

Comment 8 Darin Wright

2002-09-26 22:19:15 EDT

This is a duplicate of 21622.

*** This bug has been marked as a duplicate of 21622 ***