Re: Method entry/exit

From: [email protected]
Date: Tue, 4 Mar 1997 17:53:15 -0500 (EST)
To: [email protected]
Subject: Method entry/exit
Reply-to: [email protected]
Hi all: I am trying to find out the best way to trace method entry and exit
information for debugging. I am trying the debugger but I have not found how
to capture and print this info.
Any ideas?
Thanks...
We wrote a Diagnosis utility class way back in the early beta days to
handle this need. It's one way to go.
-- Len
==============================================
Len Leber
ATG Solutions, Incorporated
[email protected]

Ed (and others that may be using these trace flags),
This "Profiler" tracing is available in Forte Release 2.x via these
trace flags, and will be available in a furture Forte Release through
the UI. In Forte R2, there is a start-up bug with using these trace
flags with either FORTE_LOGGER_SETUP or the -fl command line flag,
so you must set them after you start your Forte process with
Modify Log Flags...
At 04:33 PM 3/6/97 +1200, you wrote:
>
You can use the trc:in:51:1 trace flag to trace method entry/exit by task.
trc:in:53:1 traces methods by the entire application. trc:in:52:1 gives a
call-tree tracing by task, and trc:54:1 gives a call-tree trace by
application.This is nice in theory, but my NT client bombs out when I start it up
with these flags. Is anyone else experiencing weirdness here? No error
messages, just the Stack Backtrace.
- Ed
================================================================================
Eduard E Havelaar, Information Services Section, University of Canterbury
internet: [email protected]
phone: +64-3-366 7001 extn 8910
fax: +64-3-364 2999
snailmail: Private Bag 4800, Christchurch, New Zealand
== Brian T. Murrell Phone: 510.869.2130 ==
== Technical Support MailTo:[email protected] ==
== Forte Software, Inc. http://www.forte.com ==

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Instance filtering of method entry/exit events in JDI

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I create method exit requests and add instance filters as follows (method entry requests are similar) (obj is an ObjectReference):
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Get method return value

Hi. We're using bytecode instrumentation in a native jvmti agent to monitor method entry/exit. I'd like to capture method return values and report them upon method exit. I see how to obtain local variables, and am indeed doing this when a method is entered; however, I'm not sure how to get a method's return value.
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RE: log trace on Service Object

I haven't tried myself; but got a copy from someone of part of technote
10398 which says (the minimum you need is:)
trc:in:1 Prints out information about interpreter state object.
10 - Print method entry/exit
trc:in:2 Trace the interpretation of method invocations and exception
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2 - Prints entry/exit and exceptions
trc:in:51:1 Traces method entry/exit by task
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Try it.
-----Original Message-----
From: Eric Abécassis [mailto:[email protected]]
Sent: Tuesday, April 13, 1999 10:24 AM
To: Forte User List
Subject: log trace on Service Object
Hi Everybody,
I would like to set log trace on each call (method entry and exit) on a
Service Object, but I didn't find any log flag which helps me.
Does someone have any ideas on how to do that ?
Thank you for your help !
Eric Abécassis <[email protected]>
Senior Architect
Sema Group DTS
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Hi Eric,
You can find on http://perso.club-internet.fr/dnguyen/ a little tool called CodeAdd which adds Entry and Return trace. I fact, you
can use it to add any kind of code at the beginning and the end of your methods.
It also allows you to add a pre-formated comments header in you code.
In a further version, It may be possible to replace a code sequence from your methods. For instance, you may add a trace class and
change a task.Part.LogMgr.Putline by a call to your own class, or need to suppress some lines.
Just be carefull to use the tool on a local backupo of your repository : CodeAdd updates your methods directly in the repository.
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
Url : http://perso.club-internet.fr/dnguyen/
Eric =?iso-8859-1?Q?Ab=E9cassis?= a écrit:
Hi Everybody,
I would like to set log trace on each call (method entry and exit) on a
Service Object, but I didn't find any log flag which helps me.
Does someone have any ideas on how to do that ?
Thank you for your help !
Eric Abécassis <[email protected]>
Senior Architect
Sema Group DTS
Eric Abécassis <[email protected]>
Senior Architect
Sema Group DTS
Eric Abécassis
Senior Architect <[email protected]>
Sema Group DTS Courrier HTML
les Algorithmes - Pythagore A route des Lucioles, BP 279;Sophia Antipolis;;06905;France Tél. cellulaire: +33 (0) 6 62 36 68 83
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Bureau: +33 (0) 4 93 95 46 50
Informations supplémentaires:
le nom ABECASSIS
Prénom Eric
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Help needed with multiple and seperate image galleries on 1 site

I'm looking for a simple way to create and manage multiple image galleries (about 100) on a single website. I work for an architect and have a site which has our project portfolio and every project has a page containing a write up with a gallery of only 6 images. Currently I am using .css to run it. If you hover over one of the 6 thumbnails it opens up a larger image in the same div container. If you move the cursor off the thumbnail the main image goes away leaving a default background. The only problem is my bosses now want each image to be retained in view until you hover over the next thumbnail.
Any ideas anyone?

I've never see a performance issue with IsSameObject(), although I understand your issue, it seems to be pretty fast.
Saving a global reference to a jclass prevents it from being GC'd, I don't think it prevents it from being unloaded.
I'm not sure I understand your comment about jmethodID's being different for the same method. Technically, the jmethodID is unique for each class image loaded and class loader. So if a class is unloaded and reloaded, or the same class managed to get loaded by two different class loaders, then you might see multiple jmethodID values. But do you know that is happening?
I have seen some race conditions on the JVMTI event callbacks around Method Entry/Exit and Thread Start/End. If you don't use some rawmonitors to protect yourself, you could be executing your callback code for the methodExit event while the thread goes away out from under you. I don't know if that could be an issue, but it caused me to scratch my head quite a bit when I ran into it.

GetLineNumberTable start_location

I have an agent that performs class disassembly of bytecodes in memory similar to how javap does for .class files. However when I print line_numbers and start_location via GetLineNumberTable, the start_location differs from the javap output. There seems to be an offset of 5. Below is the output from my agent and from javap:
agent:
public static void main(java.lang.String[]);
LineNumberTable:
line 8: 0
line 9: 15
line 10: 19
javap:
public static void main(java.lang.String[]);
LineNumberTable:
line 8: 0
line 9: 10
line 10: 14
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The Day the JVM Died.....

Ok. Im at a dead end.
Im running an app on HP and find that every now and then it becomes completely unresponsive - including kill -3's (thread dump) being igored.
CPU is low (0.5%).
The app is a web app sat on tomcat (4.1.29).
I thought initially it might be a deadlock problem - so I ran it with JDB enabled - with the aim of checing out the threads when it got stuffed.
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So, I instrumented all the jars (both tomcats and ours) with method entry / exit tracing with BCEL.
Again the problem could't be recreated with simple tracing (straight to file).
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The plan being I could delete the file after a lock up and get the last X calls for each thread dumped and see WTF was going on.
Sure enough, with this lightweight mechanism I could recreate the problem. However, as gut feeling told me, the trace files didn't get dumped after the lock up (the fact that a kill -3 was being ignored should of told me that!).
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Cant use kill -3 thread dumps, cant use remote debugging to get a thread dump, cant use tracing.
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<targeted target="lyricalGangstar">
word up, it be none other than that dirty dog LyricalGangstar shar-mon?
For sho', I is thinkin nuff dollar be rinsed out me wallet to get to tha roots of this bad bwoy.
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Also looks like there may be a needed OS patch. HP had problems with their pthreads library by the looks of it - and more to the point - in a way which JVMs could effect JVMs.
http://www.hp.com/products1/unix/java/patches/g-11.11-1.4-1111.0312.html
(Patch 29960).
We're sat on patch 29109 at the moment - so Im gonna upgrade and see where that gets me.

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We have below four fileds in real time planning cube.
Quantity
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Hi friends
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If you are able to get the workitem ID then try to use the below code snippet and check because even Iam setting some value back to the workitem container
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I am enhancing a standard class method thought an exit point at the beginning of the method. When a certain condition is satisfied in the enhancement point I want to stop the processing further and exit the complete method.
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AFAIK this is not allowed, else you could successfully replace the full SAP code by inserting in a pre-method or any start Implicit enhancement points any customer code and then exiting the form/method/module, that would not be an enhancement but a full modification of the standard SAP code and should require [SSCR key|http://service.sap.com/sscr ].
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got it from http://www.java-tips.org/

This has been published many times on this forum. What is your question?

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Hi all,
I have a requirement to update trading partner field based on payment method using Exits or BADI during payment posting (which is carried out in F110). Please give me the exact user exit/program for this requirement.
Thanks in advance
Moderator message: please do more research before asking, show what you have done yourself when asking.
Edited by: Thomas Zloch on Jun 22, 2011 9:19 AM

Hi all,
I have a requirement to update trading partner field based on payment method using Exits or BADI during payment posting (which is carried out in F110). Please give me the exact user exit/program for this requirement.
Thanks in advance
Moderator message: please do more research before asking, show what you have done yourself when asking.
Edited by: Thomas Zloch on Jun 22, 2011 9:19 AM

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