What about the memory leak Bug in foreach tag

Hi,
does anybody knows if this bug is resolved already ?
http://issues.apache.org/bugzilla/show_bug.cgi?id=25623.
I see memory leaks in our application, and deeper check with YourKit profiler show that the objects retained in the jstl tags?
Any help?

Thanks for the info.
The bug is in 'WONT FIX' status which is a shame.
ram.

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How to define the memory leak in stability test

Hi
Usually, we run our system with 70% CPU load for 72 hours for stability test (on solaris 10), because some plugin of our system is using mtmalloc, and we use prstat to monitor the memory of each plugin. But because of the complex memory usage of our application, we don't know when the application will use the Max memory, and because of the "mtmalloc", the memory showed by "prstat" will not released but continually increased.
So fro the test point of view, there is the risk of memory leak, but actually, there may be no memory leak, so my question is how to define the memory leak in such condition.

kevin wrote:
Thank you for the input and all the info.
isn't java heap the same as memory allocated to the java process in my weblogic
starup script ?The heap is sized by the -Xmx and -Xms parameters you pass on the java
command-line. The permanent generation is separate.
>
let me also download jprobe and try to run it and see what it gives me.
I'd start by running with -verbose:gc. I'd want to know whether you're
running out of heap or permgen space.
-- Rob
kevin
Rob Woollen <[email protected]> wrote:
Unfortunately memory leaks are not fun to track down even with tools.
I'd first suggest determining whether you're running out of space in
the
permanent area (where classes are loaded), or you've exhausted the java
help space.
I'd start by adding -verbose:gc. Look at the gc messages right before
you hit the OutOfMemoryError. If there's plenty of space left, I'd
suspect you're running out of perm space. Search these newsgroups and
the web for MaxPermSize, and you should see plenty of info.
If you're running out of java heap, tools like jprobe and OptimizeIt
are
helpful. If you can tell me a little more about your application and
how you're testing it, I can offer some more tips.
-- Rob
kevin wrote:
Iam new to JAVA and weblogic. I have an application that runs out ofmemory time
and again.
please let me know how to pin point this problem and moreover, howto interpret
or understand that there is a problem. I have downloaded JPROFILE tool,but it
is very confusing to understand what is goin on in this tool.
If somebody can let me know how to interpret and understand the memoryleak, that
will be great !!!
thank you.

Whether our application caused the memory leak

whether have the command to find out whether our application caused the memory leak !
We are using Jdev10g + JHeadstart(Release 9.0.5.1, BC4J + Struts + JSP) to build our enterprise application,
but when the application running some days in our Application Server(RedHat AMD64, with 8GB RAM), the memory consumed was growth seriously in production environment (one OC4J instance will caused almost 2G memory ulilization after running 2 days) that is caused us to restart the instance each day ! we doubt and worry
about maybe our application suffer the memory leak problem, so we want to know have the command to find out whether our application caused the memory leak
issue and which program is the major murderer for memory.

Ting,
Unfortunately there is no 'command' that will show you the location of a memory leak. First I would scrutinizing your code for any obvious 'leaks'. Then, you should obtain some statistics about the usage of your system. One important aspect is how long a HttpSession usually lives. If you have thousands of users that stay online the entire day and never 'time out', and if you have users on the system 24 hours a day, then the sheer number of HttpSessions might be a problem.
JHeadstart 9.0.x tends to have rather 'heavy' session objects. This can easily be solved by adding some actions to clear up DataObjects and DataObjectSets of previous 'Groups' when entering a new Group. A good place would be between the 'DynamicActionRouter' and the 'ActionRouters'. Just before entering the 'EmployeeActionRouter', you could remove all DataObjects and DataObjectSets that might be left on the Session by actions of the other ActionRouters.
Also it would be interesting to see if the garbage collector can do its thing when the system is less busy. For instance, if your application has a smaller load during the weekend, what is the memory usage on Sunday at midnight compared to, say, Friday at noon. Has the memory load dropped consistently with the decreased number of online users, or does too much memory stay allocated? If so, then there's more going on than just HttpSession objects.
If all this does not lead to a solution, I suggest using a profiling tool such as OptimizeIt to investigate the memory usage of the application in detail.
Kind regards,
Peter Ebell
JHeadstart Team

What about session memory when using BEA Weblogic connection pooling?

Hi,
consider a web application, allowing database connections via a BEA Weblogic 8.1 application server. The app-server is pooling the oracle connections. The oracle database is running in dedicated server mode.
How are the database requests from the web app served by the connection pool from BEA?
1) Does one oracle session serve more than one request simultanously?
2) Does BEA serialize the requests, which means, that a session from the pool is always serving only one request at a time?
If (1) is true, than what about the session memory of Oracle sessions? I understand, that things like package global variables are beeing stored in this session private memory. If (1) is true, the PL/SQL programmer has the same situation, as with programming an Oracle databas in "shared server" mode, that is, he should not use package global variables etc.
Thankful for any ideas...
Message was edited by:
Xenofon

Xenofon Grigoriadis wrote:
Hi,
consider a web application, using BEA between client and an Oracle Database (v9i). BEA is pooling the oracle connections. The oracle database is running in dedicated server mode.
How are the database requests from the web app beeing served by the connection pool from BEA?
1) Does one oracle session serve more than one request simultanously?no.
2) Or does BEA serialize the requests, which means, that a session from the pool is always serving only one request at a time?
Reading "Configuring and Using WebLogic JDBC" from weblogic8.1 documentation, I read:
"... Your application "borrows" a connection from the pool, uses it, then returns it to the pool by closing it...."
What do you mean by returning the connection by closing it? Tbe server will either return the connection to the pool or close it...When application code does typical jdbc code, it obtains
a connection via a WebLogic DataSource, which reserves an
unused pooled connection and passes it (transparently wrapped)
to the application. The application uses it, and then closes
it. WebLogic intercepts the close() call via the wrapper, and
puts the DBMS connection back into the WebLogic pool.
The reason, why I as an Oracle programmer ask this is, because every session (=connection)
in Oracle has its own dedicate, private memory for things like global PL/SQL variables.
Now I want to figure out, if you have to careful in programming your databases, when
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also transparently cache/pool prepared and callable statements with the
connection so repeat uses of the connection will be able to get already-made
statements when they call prepareStatement() and prepareCall(). These
long-lived statements will each require a DBMS-side cursor.
>
Thankful for any ideas or practical experience...
Message was edited by:
mk637Joe

Find out whether our application caused the memory leak

whether have the command to find out whether our application caused the memory leak !
We are using Jdev10g + BC4J + Struts + JSP to build our enterprise application,
but when the application running some days in our Application Server(RedHat AS3-86, with 4GB RAM), the memory consumed is serious ! we doubt and worry
about maybe our application suffer the memory leak problem, so we want to know have the command to find out whether our application caused the memory leak
issue and which program is the major murderer for memory.

The second scenario is, as we perform some deployment activity on 10g, the memory usage chart shows a sharp consumption of memory about 1.5GB .the loss memory almost be display in "other" legend chart !
Please give us some advice , thanks in advance

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The application has been run for one day and the OOM error was thrown again. So I downloaded the hprof file and used MAT to parse it.
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Thread 12135: (state = BLOCKED)
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Error occurred during stack walking:
sun.jvm.hotspot.utilities.AssertionFailure: Only used on C2 x86
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Can't find the memory leak in Managed Object

Hey guys...I am trying to find the memory leak that Instruments says I have in this section of code setting up a managed object:
oCurrentSection = (Section*) [NSEntityDescription insertNewObjectForEntityForName:@"Section" inManagedObjectContext:[[CoreDataManager sharedData] oManagedObjectContext]];
oCurrentSection.nsSectionName = [attributeDict objectForKey:@"name"];
oCurrentSection.nsImgUrl = [attributeDict objectForKey:@"imgURL"];
oCurrentSection.nsDesc = [attributeDict objectForKey:@"desc"];
oCurrentSection.iOrder = [NSNumber numberWithInt: [[attributeDict objectForKey:@"order"] intValue]];
Can anyone help me out?

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Procyon, what's wrong with a huge swap? Wouldn't you do it too if you were given a system with 200GB hdd more than necessary and told to make a webserver?
[root@norpass ~]# df -H
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 7.9G 1.1G 6.8G 14% /
none 1.1G 0 1.1G 0% /dev/shm
/dev/sda1 40M 9.9M 28M 27% /boot
/dev/sda4 238G 4.5G 234G 2% /home

[InDesign CS3] how to find the reason of the memory leaks?

Hi all,
I'm working with InDesign CS3. I wrote a plug-in and loaded it into InDesign in debug mode. After I closed the application, I got a console window showing memory leaks as following:
Leaks! 52 leaks, 716804 bytes
Press any key to continue . . .
Does anybody know how to find the reason of the memory leaks? Thanks a lot!
Nicole

Thanks Dave. I'm using Windows, and I also tried MemoryTracker. I got a Leaks.txt which shows the detail of memory leaks as following. But I really can't understand it. Any help? Thanks. 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What is the memory concept u201CExport to memory idu201D.

Hello Experts!!!
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This is from SAP help:
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Obsolete short form
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END OF tab_type.
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id    TYPE c LENGTH 10 VALUE 'TEXTS',
text1 TYPE string VALUE `IKE`,
text2 TYPE string VALUE `TINA`,
line TYPE tab_type,
itab TYPE STANDARD TABLE OF tab_type.
line-para = 'P1'.
line-dobj = 'TEXT1'.
APPEND line TO itab.
line-para = 'P2'.
line-dobj = 'TEXT2'.
APPEND line TO itab.
EXPORT (itab)     TO MEMORY ID id.
IMPORT p1 = text2
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What about the memory leak Bug in foreach tag

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