Attached is the *JDEBug* buffer,
as well as the output in the *Messages* buffer --for the following:

Emacs: 20.7
JVM IBM JDK 1.3.0 
10:18:38 bubbles tvraman $ java -version
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)

Classic VM (build 1.3.0, J2RE 1.3.0 IBM build cx130-20001025 (JIT
enabled: jitc))

------------------------------
App being debugged --
ASBuilder.java from xerces2/samples --I rebuilt this with debugging
turned on.

Symptoms:

When you launch the debugger by:

0) start jdebug process (no errors)
1) Set break points (no errors)
2) Launch process using C-c C-v C-d 
emacs appears to hang, and emits "failed to connect to debugger "
message in *Messages* buffer.
However, it appears to have connected in fact because the break point
is found --and step-over works.
Emacs continues to emit "unable to connect" messages in *Messages*.
3) Local variables buffer remains empty.

Here is *JDEBug* buffer --followed by *Messages*
--there are messages in *Messages* that apear to be missing in
*JDEBug* which is why I am appending both.

--------------------------------------------------
cd /disk/local1/downloads/build/xerces/samples/dom/
/usr/java/bin/java -classpath 
/home/tvraman/emacs/lisp/site-lisp/jde/java/lib/jde.jar:/usr/java/lib/tools.jar 
jde.debugger.Main


(jde-dbo-init-debug-session)

JDE> -1 1 launch 1 -vmexec java -classpath 
/usr/share/java/xercesImpl.jar:/usr/share/java/xercesSamples.jar:/usr/share/java/xmlParserAPIs.jar
  dom.ASBuilder  -a /home/tvraman/ibm/projects/xerces/toy.xsd -i 
/home/tvraman/ibm/projects/xerces/toy.xml


(jde-dbo-message
1 "Launched VM Java Debug Interface (Reference Implementation) version 1.3 
Java Debug Wire Protocol (Reference Implementation) version 1.0
JVM Debug Interface version 1.0
JVM version 1.3.0 (Classic VM, J2RE 1.3.0 IBM build cx130-20001025 (JIT disabled))")


(jde-dbo-message 1 "initSIOConnect: starting standard I/O handshake.")


(jde-dbo-message 1 "initSIOConnect: starting SIO connect thread.")


(jde-dbo-command-result 1 2963)


(jde-dbo-message
1 "Debugger waiting for Emacs to connect to app SIO port 2963.")

JDE> 1 2 break absolute ASBuilder.java 135


(jde-dbo-message 1 "Debugger connected to standard I/O socket.")


(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "waiting" "suspended by debugger"
(list)
(list)
nil)
(list 'jde-dbo-vm-start-event))


(jde-dbo-command-result 2 0)

JDE> 1 3 break absolute ASBuilder.java 130


(jde-dbo-command-result 3 1)

JDE> 1 4 break absolute ASBuilder.java 128


(jde-dbo-command-result 4 2)

JDE> 1 5 run


(jde-dbo-command-result 5)


(jde-dbo-spec-resolved 1 1)


(jde-dbo-spec-resolved 1 0)


(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended at breakpoint"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 130 "main"))
(list)
nil)
(list 'jde-dbo-breakpoint-hit-event 1
(list "dom.ASBuilder" "ASBuilder.java" 130) nil nil))

JDE> 1 6 get_locals 1 0


(jde-dbo-command-result
6 (list 
(cons (list "argv" "java.lang.String[]") (list "java.lang.String[]" 217 nil))))

JDE> 1 7 get_this 1 0


(jde-dbo-command-result 7 (list "null"))

JDE> 1 8 step over 1


(jde-dbo-command-result 8)


(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended at breakpoint"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 135 "main"))
(list)
nil)
(list 'jde-dbo-step-event (list "dom.ASBuilder" "ASBuilder.java" 135))
(list 'jde-dbo-breakpoint-hit-event 0
(list "dom.ASBuilder" "ASBuilder.java" 135) nil nil))
JDE> 1 9 get_locals 1 0



(jde-dbo-command-result
9 (list 
(cons (list "argv" "java.lang.String[]") (list "java.lang.String[]" 217 nil))))

JDE> 1 10 get_this 1 0


(jde-dbo-command-result 10 (list "null"))

JDE> 1 11 step over 1


(jde-dbo-command-result 11)


(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended by debugger"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 137 "main"))
(list)
nil)
(list 'jde-dbo-step-event (list "dom.ASBuilder" "ASBuilder.java" 137)))

JDE> 1 12 get_locals 1 0


(jde-dbo-command-result
12 (list 
(cons (list "domImpl" "org.apache.xerces.dom3.as.DOMImplementationAS") (list 
"org.apache.xerces.dom.DOMImplementationImpl" 223 nil))
(cons (list "argv" "java.lang.String[]") (list "java.lang.String[]" 217 nil))))

JDE> 1 13 get_this 1 0


(jde-dbo-command-result 13 (list "null"))



--------------------------------------------------
ava -classpath 
/usr/share/java/xercesImpl.jar:/usr/share/java/xercesSamples.jar:/usr/share/java/xmlParserAPIs.jar
  dom.ASBuilder  -a /home/tvraman/ibm/projects/xerces/toy.xsd -i 
/home/tvraman/ibm/projects/xerces/toy.xml

Emacs connected to standard IO port 2963 for process dom.ASBuilder.
Launched VM Java Debug Interface (Reference Implementation) version 1.3 
Java Debug Wire Protocol (Reference Implementation) version 1.0
JVM Debug Interface version 1.0
JVM version 1.3.0 (Classic VM, J2RE 1.3.0 IBM build cx130-20001025 (JIT disabled))
initSIOConnect: starting standard I/O handshake.
initSIOConnect: starting SIO connect thread.
Debugger waiting for Emacs to connect to app SIO port 2963.
Setting breakpoint at line 135 in 
/disk/local1/downloads/build/xerces/samples/dom/ASBuilder.java.
Debugger connected to standard I/O socket.
vm started...
All threads suspended...
Setting breakpoint at line 130 in 
/disk/local1/downloads/build/xerces/samples/dom/ASBuilder.java.
Setting breakpoint at line 128 in 
/disk/local1/downloads/build/xerces/samples/dom/ASBuilder.java.
Running dom.ASBuilder.
Resolved breakpoint set in 
/disk/local1/downloads/build/xerces/samples/dom/ASBuilder.java at line 130.
Resolved breakpoint set in 
/disk/local1/downloads/build/xerces/samples/dom/ASBuilder.java at line 135.
No response to command 7. (process = 1; timeout = 10 sec.)
Error: evaluating debugger output caused a Lisp error.
  See *messages* buffer for details.
Error: evaluating output from the debugger caused a Lisp error.
Debugger output: (jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended at breakpoint"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 130 "main"))
(list)
nil)
(list 'jde-dbo-breakpoint-hit-event 1
(list "dom.ASBuilder" "ASBuilder.java" 130) nil nil)).
Lisp error: (wrong-type-argument (or object-p class-p) nil)
End of buffer
Beginning of buffer [2 times]
No response to command 10. (process = 1; timeout = 10 sec.)
Error: evaluating debugger output caused a Lisp error.
  See *messages* buffer for details.
Error: evaluating output from the debugger caused a Lisp error.
Debugger output: 
(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended at breakpoint"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 135 "main"))
(list)
nil)
(list 'jde-dbo-step-event (list "dom.ASBuilder" "ASBuilder.java" 135))
(list 'jde-dbo-breakpoint-hit-event 0
(list "dom.ASBuilder" "ASBuilder.java" 135) nil nil)).
Lisp error: (wrong-type-argument (or object-p class-p) nil)
No response to command 13. (process = 1; timeout = 10 sec.)
Error: evaluating debugger output caused a Lisp error.
  See *messages* buffer for details.
Error: evaluating output from the debugger caused a Lisp error.
Debugger output: 
(jde-dbo-event-set
1 "all"
(list "Thread" 1 "main" "runnable" "suspended by debugger"
(list
(list 0 "dom.ASBuilder" "ASBuilder.java" 137 "main"))
(list)
nil)
(list 'jde-dbo-step-event (list "dom.ASBuilder" "ASBuilder.java" 137))).
Lisp error: (wrong-type-argument (or object-p class-p) nil)

-- 
Best Regards,
--raman
------------------------------------------------------------
T. V. Raman:  PhD (Cornell University)
IBM Research: Human Language Technologies
Architect:    Conversational And Multimodal WWW Standards
Phone:        1 (408) 927 2608
Fax:        1 (408) 927 3012
Email:        [EMAIL PROTECTED]
WWW:      http://www.cs.cornell.edu/home/raman
AIM:      TVRaman
PGP:          http://emacspeak.sf.net/raman.asc
Snail:        IBM Almaden Research Center,
              650 Harry Road
              San Jose 95120

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