JVMTI Based Profiler problem

Hi to all,
I am working on a JVMTI based profiler agent library, using this i am trying to achieve the BCI during runtime.
I am using JVMTI's redefine class features and instrumenting the bytecode during runtime.
Now i am facing a realy weird problem consider my first scenario:
1) I run a sample application (consider class A) that prints a simple message inside an infinite loop, this method is called from another threaded class (consider class T).
2) After the sample application (class A) starts up i immediately change its bytecode, redefines the sample loaded class & reloads it.
3) After Reloading the sample class (class A) with instrumented class i got the desired instrumented output.
This is the way i wanted it to always behave, but consider another scenario:
1) I run a sample application (consider class A) that prints a simple message inside an infinite loop, this method is called from another threaded class (consider class T).
2) After the application (class A) starts up, i wait for some time doing nothing and let the application run for quite some time (8-10 minutes).
3) Now change its bytecode, redefines the sample loaded class & reloads it.
4) After Reloading the sample class (class A) with instrumented class what i saw that it still executes the older class only, this is not what i expected it to do.
I can't understand the 2nd scenario behaviour as i already checked the stack overflow during sample method call in my base class, which never occurs.
I use asm classes to invoke the instrumented byte code methods at runtime, which works fine till i instrument the class immediately.
Any help in this regard would be appreciated.
Thanks
bharat...

Hi Dan,
answers to the questions you asked are below:
dcubed wrote:bharat,
I'm trying to understand your scenarios. A couple of questions embedded below.
bharat.gusain wrote:
1) I run a sample application (consider class A) that prints a simple message inside an infinite loop, this method is called from another threaded class (consider class T).So class T has a method that calls a method in class A. The methodin class A executes an infinite loop printing a simple message. Just
to confirm: the method in class T is not calling the method in class A
from an infinite loop.No Actually the class T runs the infinite loop (inside the run method since its a thread), inside this infinite loop i am calling a method of class A(Which prints the message).
yes class T's run method is calling from an infinite loop, class A's method.
2) After the sample application (class A) starts up i immediately change its bytecode, redefines the sample loaded class & reloads it.What do you mean by "starts up"? Do you mean that you redefinethe sample loaded class before the method with the infinite loop is
called?NO class T started the thread which calls infinitely the class A's method, hence both class T and class A were loaded and executing when i redefined the class A's method.
3) After Reloading the sample class (class A) with instrumented class i got the desired instrumented output.So did you get some of the original output followed by the desiredinstrumented output?Yes, I get the original message followed by the instrumented output.
This is the way i wanted it to always behave, but consider another scenario:
1) I run a sample application (consider class A) that prints a simple message inside an infinite loop, this method is called from another threaded class (consider class T).
2) After the application (class A) starts up, i wait for some time doing nothing and let the application run for quite some time (8-10 minutes).
3) Now change its bytecode, redefines the sample loaded class & reloads it.
4) After Reloading the sample class (class A) with instrumented class what i saw that it still executes the older class only, this is not what i expected it to do.In this scenario, the method with the infinite loop is running before the redefine and after the redefine, the output doesn't change. Do I have that right?Yes the class T's run method is running an infinite loop(which inturn keeps on calling class A's method), i have not redefined the class A yet.
Now after waiting for 10 minutes i finaly redefines the class A.
After redefinition the method of class A is still displaying the same old message output, and class T's thread is still running the infinite loop, just i am missing the instrumented output.
I can't understand the 2nd scenario behaviour as i already checked the stack overflow during sample method call in my base class, which never occurs.I'm not sure what "stack overflow" has to do with anything. I'm guessing you mean that you checked for errors and didn't get any.I thought because i am calling the method infinitely after sometime it might happened that stack got full and hence i am getting this weird issue, so now i check for stack overflow exception each time i am calling the class A's method.
I use asm classes to invoke the instrumented byte code methods at runtime, which works fine till i instrument the class immediately.The above sentence doesn't quite match the scenarios described above.According to the above, immediate redefinition worked and redefinition
after a delay did not work.
Any help in this regard would be appreciated.I'm guessing that we'll get to the bottom of this with answers to the above questions.DanSorry for misunderstanding... what i meant was, immediate redefinition worked and redefinition
after a delay did not work.
Regards
bharat..
Edited by: bharat.gusain on Jan 20, 2009 11:47 PM

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Concerning white balance procedure you say:
Using the grey card of the same product placed just outside the subject crop.
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OK.
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You should try to familiarize yourself with the concepts of color management.
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How to solve the Embed Color Profile problem...

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I just posted this as feedback to Apple and was curious to see if anyone was having the same problem:
I have a dual monitor setup: One Eizo CG222W and one Eizo CG210. The 222W is my primary display (menu bar on this one). Both monitors are calibrated and profiled with a Spyder3 and ColorEyes Display Pro. I have the profiles loaded on both displays. It is worth noting that both (particularly the 222W) are wide gamut, so you may well not see this happening if you are looking at an Apple Cinema display (no offence, but you're just not going to see this so pronounced on an Apple display). To put it into perspective, I have just bought the CG222W and was not noticing any issues with the CG210 because its gamut is narrower (but still wider than a cinema display).
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There is well documented issue with this problem. The fix is to set your default monitor to whichever monitor you are using to view Aperture in full screen, using color sync utility.
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Kai,Simon,
This is the problem i have been having.Colour profiling is correct,prints are rubbish.I run a fuji frontier
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Simon,the problems we are have are very similar to you clients,photoshop fine,aperture not.I also have 20"external apple monitor attached which is used as the colour correcting monitor ( as the imac screen is not that good for criticl work ) I will post my findings here.
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Hi Marty,
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This solved the problem for me.
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The access point / router is a Comtrend 5361. The SSID is set to hidden (no broadcast), and the security is set to WPA-PSK (pre-shared key).
On the Nokia phone I go to 'Settings -> Connectivity -> Wireless LAN' and choose 'Other (hidden netw.)'.
Then I choose 'Connect', set the WLAN network name, the phone shows a message 'No WLAN network found', but then prompts to choose network mode (Infrastructure - Hidden), and then password. It connects succesfully and asks for storing the network profile under offline mode, I tell it to do so, and the new profile appears under 'Network destinations -> Internet'. So until now everything seems ok.
The problem is that after the phone disconnects from the internet, the stored profile seems to be useless, since the phone never connects automatically even if the AP is available and always shows 'Search for WLAN'. In the list the hidden access point never shows up so the only choice is repeating the steps that I mentioned above, creating a new profile every time I want to surt the net.
Is there a solution to this, or a third party software that can do the trick?, I have OS V21.0.25, custom version 21.0.025.219.06 from Vodafone, no updates available as of today, but I've tested it with a phone that has the latest OS v30 and it shows the same behavior.
I can't change the access point settings, so I must stick to WPA and hidden SSID, so for me this is almost a deal breaker.

Ok, I was testing the wifi part without a sim card inserted, with a sim, the phone connects to the profile properly, but without the sim it has an odd behavior, not loading the profile and wrongly stating that it can't connect when it does (but disconnects randomly).
So the problem is that wireless lan management doesn't work properly without a sim card.

Role Based Access problem in forms

This would be a long reading.
I'm having a problem with forms Role Based Access.
We have two databases, one in London and one in Zurich. We have installed
application server and oracle forms on London database. We have implemented
Role Based Access to forms. For this we have created a database role (say ZUR_USER)
in both databases. The view FRM50_ENABLED_ROLES which is used by forms role based access control
is also created in both databases with a 'grant select to public'.
Our form system has a menu and forms under that menu. Both menu and the underlying forms have been
assigned Menu Security/Item Roles to the above mentioned ZUR_USER role and the role is assigned
to various users.
Now a Zurich user is trying to login to Zurich database using the URL for forms installation
in London server. He can login successfully and can see the menu heading in the main screen but
when he clicks the menu he doesn't see the underlying forms list.
When we try the same user id and database from London (using the same URL) we see all the forms.
Any idea what are we missing. The Menu Security is setup at menu level as well as the form level under
that menu. User can see the menu but not the form under that menu from Zurich. No such problem while
login from London.

I'm using the Forms 10g
and yes the only difference is between login from Zurich and London.
Problem definitely is due to Role Based Access setup.
The user in Zurich can see the Menu but not the items under that menu.
I have set the security set up at both menu and menu item(i.e. form name) level.

JVMTI Based Profiler problem

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