ClassDefiner.defineClass() leaking memory in a RMI method invocation.

Hi,
My application uses RMI for communicating between two java processes.
I'm observing some kind of memory leak in one of the classes in RMI
library. When observed through OptimizeIT, I see a large number of
Object[] being created by the ClassDefiner.defineClass() &
ClassDefiner$1().run().
These Object[] arrays keep accumulating, never get garbage collected.
Attached is the screen shot of OptimizeIT, which shows object allocation
hierarchy.
Any help in this regard would be appreciated.
The JDK version being used is, 1.4.2_05.
thanks in advance.
Vijayendra

Update -
The reason for this was found to be "-Xnoclassgc" After removing this option from the startup script, I didn't notice any increase in object[]/int[] count.
Hoping this would fix the issue.

Similar Messages

RMI method invocation leading to Memory Leak

My application uses RMI for communicating between two java processes.
I'm observing some kind of memory leak in one of the classes in RMI
library. When observed through OptimizeIT, I see a large number of
Object[] being created by the ClassDefiner.defineClass() &
ClassDefiner$1().run().
These Object[] arrays keep accumulating, never get garbage collected.
Attached is the screen shot of OptimizeIT, which shows object allocation
hierarchy.
Any help in this regard would be appreciated.
The JDK version being used is, 1.4.2_05.
thanks in advance.
Vijayendra

The reason for this was found to be "-Xnoclassgc" After removing this option from the startup script, I didn't notice any increase in object[]/int[] count.
Hoping this would fix the issue.

GetOracleDecimal seems to leak memory?

Hello, I am using the C# statement below to retrieve a decimal value from an OracleDataReader, adjust the precision, then assign it to a .NET decimal type:
decimal volume = (decimal)OracleDecimal.SetPrecision(reader.GetOracleDecimal(5), 28);
Over time, the service that hosts this method leaks memory. After some investigation, I found that "Oracle.DataAccess.Types.OpoDecCtx" types were collecting in the finalize queue. Any ideas on how to resolve this? I can't explicitly Dispose() an OracleDecimal...
I'm using ODP.NET version 2.102.2.20.
Thanks

Thanks for the reply. I am using .NET 2.0 SP2. I upgraded the ODP.NET client to 2.111.7.20 but am still seeing leakage of the OracleDecimal structs.
Here's a snippet of output from WinDbg:
Ready for finalization 32874 objects (0b4de540->0b4fe6e8)
Statistics:
MT Count TotalSize Class Name
00fb8cec 32816 656320 Oracle.DataAccess.Types.OpoDecCtx
With each pass of the service the Count and TotalSize grow in increments equal to the number of rows I'm querying...
Just for laughs I changed the GetOracleDecimal statement to GetDecimal and the memory issue went away (because I'm no longer creating OracleDecimals). But I need to use the higher precision type to prevent overflows..
Thanks again..

Distributed objects leak memory

When passing this C struct
NSString* nickname;
unsigned age;
} ConnectInfo;
to this method of distributed object
- (oneway void)connect:(in ConnectInfo*)ci
nickname = \[ci->nickname retain]; // or copy - doesn't matter
the NSString is reported leaked by `leaks` tool. There are as many strings leaked as many calls I did. Memory dump shows exactly this string object's contents. Allocation stack trace points inside NSInvocation/_NSWalkData, not into my code.
Distributed object is running in separate Cocoa thread in same process. Both threads has auto-release pool established, and there's no warnings in log regarding autoreleasing. SDK is 10.4u, OS is 10.5.4, my platform is PowerPC.
I tried all combinations of oneway, two-way, in, inout, bycopy, byref, retaining, copying, passing pointer, or reference (ConnectInfo&) to string - every time the string is leaked. If there are more strings in struct, they are also leaked. The only working method is to cast pointer to integer value, but this is a kind of hack.
DO runtime is obviously doing a deep copy of plain C struct, and somehow forgets to release Obj-C objects it copied. Is this a DO bug, or am I doing something wrong?

kasym wrote:
DO runtime is obviously doing a deep copy of plain C struct, and somehow forgets to release Obj-C objects it copied.
No, it isn't. It is doing a bitwise copy. It doesn't "forget" to release the Objective C object. That object is inside a C struct. Nothing happens automatically in C.
Is this a DO bug, or am I doing something wrong?
You are doing something wrong. When working in Cocoa, especially things like Distributed Objects, stick to Cocoa. Use an NSDictionary instead.

Does ReportDocument leak memory?

Using CrystalDecisions.CrystalReports.Engine.ReportDocument XI R2. w3wp.exe memory use raises while a report is generated (which is expected), yet it does not seem to be ever released after. If you keep generating same report again and again, IIS eventually runs out of memory. A report does not call any external DLLs or COM objects. Calling repDoc.Dispose() does not seem to help. Please help. 

Methods:
Dispose()
GC.WaitForPendingFinalizers()
GC.Collect()
Details:
I created a C# application that connects to BOXI.
It does not specifically use the ReportDocument object, but was also encountering serious memory issues.
I was also using the Dipose method to mark objects for garbage collection.
.Net garbage collection happens automatically (at some time or another), but you can force it using GC.Collect(). I tried this, but was still leaking memory.
Until I found GC.WaitForPendingFinalizers(), which causes the garbage collector to wait until all disposed objects have completely finished their destructors. I think this made the difference with BOXI objects, because they are nested.
After I was using all three methods, I had no more memory issues. I realize this information may be out of date, but I posted it for future seekers.

Flash is killing Safari, which is leaking memory ...

I just saw in Activity Monitor that the Flash plugin is using 147% of the CPU, with one Flash movie playing in one of 12 open Tabs
And Safari seems to leak memory as well, after a day or two it easily can use up to 3GB(!) of RAM.
I am now quitting Safari routinely every 2 to 3 hours to get the CPU usage down and free RAM for other stuff, but I don't think this method makes for a great user experience.

Hi,
Use ClickToFlash... that way you have control of Flash content.
http://clicktoflash.com/
Carolyn

How to avoid the case of leaks memory in Object Oriented Programming

Hi, Everyone, I am writing a simple web-baed application for JSP and Servlet, I pass all data from JSP to Servlet, It is due to the number of row of record are variable, so I should write a Java Instance class to stored to specific data in a Java Object, and then stored those object in a arraylist In the Servlet class, and then pass the arraylist in to a session, to pass the session from the servlet to another JSP......
But some thing I am worried about is that if the no of row of record user input is large, then the number of object stored in the arraylist will also large. I am worried it will serious leaks memoary in my server. Because my server always occurs "Out Of Memoary Exception" in Tomcat, So If I use the above method. I affarid the memory will be further leaking in my server. So What can I do? Is it having any better method to prevent memory leaking when using Object Oriented Programming(Except using Hibernate)?
Can Anyone be help me?
Thank you very much for All, THX

Because many people say that the large amount of
using Object will lead to "memory leak", I am worried
about the size of object I use is too large and then
it will construct "memory leak". No it will not! You get a 'memory leak' by holding references to objects you no longer require.
>
The detail of my case is that:
In my web application, there is a session variable
pass through from one servlet to another jsp/servlet.You should only place small amounts of data in the session. If you need forward from a Servlet to a JSP (or JSP to Servlet) then you should place the data object in the request (using the setAttribute() method), not in the session. In this way, when the session is re-claimed so will be the data object.
And this session variable is stored a Instance Object
(which is a class write by me) with the following
issue:
1) This instance object having "has-a relationship"
with another four instance object (all are the
classes write by me)
2) This instance object having "has relationship"
with a arraylist, this arraylist is stored about 4-5
instance object(all are the classes write by me) .
If this object having the above issue, Will this
object construct a "leaks memory" when this object
stored in the session and pass through servlet to
another jsp/servlet?
Message was edited by:
sabre150

Imapd service "Leak Memory"

I already have Java Communications Suite 6 Working , but, I have a Leak Memory problems with imapd process.
I have the server with 30 imapd process, 30 mshttpd process, and 30 pop process running to balance the load of the users.
All work fine(the CPU is 100% idle, the RAM is 80% available=6GB) when I access via browser(Chrome,Firefox), too when I access it with the traditional clients IMAP (Outlook, ThunderBird,etc).
The problem is that if one user want to copy(not just view) locally all your emails to your laptops/pc, the imapd process eat more than 3GB(instead of 80MB) of RAM and the system is getting slower.
If the user cancel this process(copy via IMAP all your emails) the process dont freedom doesn't release the memory and the system getting slower.
Actually my solution is:
# kill -9 <PID_imapd>
Some times when I kill the process the problem going to other imapd process, so in this case the solution is:
/opt/sun/comms/messaging/sbin/stop-msg
/opt/sun/comms/messaging/sbin/start-msg
I think that this problem is a bug but I dont know what is the patch.
May you help me? Any idea?
My system is:
A X2100 with one socket AMD Opteron 2600Mhz, 8GB RAM, 2 x disks 750GB in mirror with Solaris Volume Manager, Soalris 10 HW 10/08.
Thanks.
Jaime

Jorth, maybe we are not well explained,
the normal operation of imapd process(one process) need no more that 200MB, when a user is linked to it.
Check my example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16673 mailsrv 220M 97M sleep 59 0 0:00:06 0.0% imapd/6*
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 28% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
1 noaccess 90M 100M 1.2% 0:01:13 0.0%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
================================================================================================================
When we run an aplication like OutLook to copy locally to the laptopn all the mail via IMAP, "ONE imapd process" eat more memory that need it and never released.
Example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
*16673 mailsrv 2856M 2534M sleep 59 0 0:00:06 45% imapd/6* <---------------this process eat memory and slow the system(CPU/RAM)
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 80% 0:00:5 0.5%
78 mailsrv 2439M 2329M 10% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
===================================================================================================
The rest of the imapd process(29) in this moment just load 40-50MB(when those are free).
If we kill the process 16673 the user connect to the next imapd process and the problem persist whit the same patology: eat memory and CPU, and slow the system.
So, we think that is not normal and maybe we need patch the system to solve the problem.
We will to test the 64Bit version in this moment and we will post the results.
Thank
Jaime

Memory management with static methods

I made a class with no attributes and only static methods with the purpose of maintaining as little as possible about it in memory. What information is kept in memory by the JVM about such a class ?
Thanx in advance :)

Static methods don't consume less memory than regular instance
methods. Well, not exactly: a regular method requires a reference
to an instance as a hidden additional parameter. Thus, specifying
static for methods that don't access the object may actually save
a few bytes. However, the code is not duplicated for each instance.
Additionally, the JVM must keep any initialization values and the
names of the class and the methods, as needed by reflection.
Given suitable debugging options, local variables names and line
number may be kept in memory as well. Finally, all hosekeeping
info (gc, references and the like) must be kept in memory.

Leak memory in xerces DomParser

Hey,
I have " leak memory " in my Java application (Stand alone).
I suspect that this leak caused by xerces DomParser.
i reached to this conculsion after using in Jprobe as a memory debuger.
Does any one has a similar problem?
Thank you.
code:
DOMParser parser = new DOMParser();
parser.parse(new InputSource(new FileInputStream(schemaFile)));

Hey, which Version of Xerces do you use?

Why does Firefox 4 (4.0.1 specifically) leak memory?

'''Answer:''' I figured it out.
History lesson first. Ever since the 4.0.1 update, Firefox 4 has been crashing A LOT. It's gotten so bad that FF4.0.1 will eat memory with no end in sight and eventually Windows (Win 7 64-bit) forcefully close the program due to an out of memory error.
I have 8 GB of RAM installed. And, it would crash once it exceeds 1.5 GB of RAM used by Firefox 4. I've seen Firefox 4 go up to 1.85 GB of RAM in Task Manager. This is with 20 tabs open.
With the add-on Leak-Monitor, I've narrowed down the issue. Having only Leak-Monitor as the extension installed, all pop-ups point to how '''poorly Firefox 4 handles Javascript'''!
MSNBC Leak Monitor issue:
[http://www.octoberasian.com/tech/text/FF4-Leak-Monitor_MSNBC.txt Leak Monitor log from MSNBC.com]
I've gotten more pop-ups from even support.mozilla.com because of the Javascript on this website.
Firefox 4.0.1 is leaking memory from every Javascript on every website I load. It's leaking memory as we speak with only this page loaded (one tab).
FIX IT! Firefox 4 is poorly handling Javascript, especially when multiple tabs are opened.

octoberasian: I, too, am experiencing this phenomenon. I shut my system down, pulled the EIC cable, held down the power button - then replugged and rebooted. I closed down every unneeded application that I have set to auto-start. Finally, I opened a single Firefox 4.0.1 window and let it sit. It began with consuming 43 Mb of memory. By afternoon - about 5 hours later - it was up to 203 Mb. There is definitely something very wrong with this version. It does the same on all the machines we have, sans our server. We don't use the server for anything but being a server & it has some version of Firefox 3 on it anyway. No Java Scripts were running, nor were any Adobe ARM or any plugins. I noticed when plugins run - the memory leakage goes into overdrive. Hey, I'm just sayin'...

Skype 6.4 continues to leak memory at an astonishing rate? Hard crashes ALL my Macs

Last version of Skype 6.3 leaked memory like a river full of rapids. And once it gobbled up 1.5gigs or so of memory, it HARD crashed my iMac requiring a hard reboot. It only takes about 30 minutes for skype to do this. My iMac (2012 Core i7 3.4ghz 32 gigs RAM) is at Mac OSX 10.7.5 and it is repeatable every time. I have to set timers to remind me to restart Skype every 30 minutes.
We thought 6.4 would fix the issue but no luck doing exact same thing. My colleague is across the country on an iMac with 10.7.5 same issues. Repeatable on my Macbook Pro running 10.8. If he let's it run, he gets the black screen of death and have to hard restart. Just like me.
This issue has been around for several weeks and is making skype unusuable for us and we rely on it heavily. Note we are PAYING customers. to Skype.
This ONLY happens if we use the video feature. Submitted to Skype, wondering if anyone else having issue?

Last version of Skype 6.3 leaked memory like a river full of rapids. And once it gobbled up 1.5gigs or so of memory, it HARD crashed my iMac requiring a hard reboot. It only takes about 30 minutes for skype to do this. My iMac (2012 Core i7 3.4ghz 32 gigs RAM) is at Mac OSX 10.7.5 and it is repeatable every time. I have to set timers to remind me to restart Skype every 30 minutes.
We thought 6.4 would fix the issue but no luck doing exact same thing. My colleague is across the country on an iMac with 10.7.5 same issues. Repeatable on my Macbook Pro running 10.8. If he let's it run, he gets the black screen of death and have to hard restart. Just like me.
This issue has been around for several weeks and is making skype unusuable for us and we rely on it heavily. Note we are PAYING customers. to Skype.
This ONLY happens if we use the video feature. Submitted to Skype, wondering if anyone else having issue?

DS 5.1sp2 SLAPI plugins leak memory

I am running DS 5.1sp2, on Solaris 9/SPARC, and have been encountering problems with the ns-slapd process leaking memory when using SLAPI plugins.
We have written our own bind pre-operation plugin function which, when enabled, causes ns-slapd to leak memory at a pretty rapid rate. I have a simple test where I perform a simple ldapsearch in an endless loop. The ns-slapd process starts off with a VSS of ~617MB (we have a fair amount of cache enabled) ; after a few minutes of my test, the VSS grows by several MB. With the plugin disabled, I can run the same test for hours with no growth in the VSS of ns-slapd.
I have also performed this test with my plugin disabled, and the "testbind" plugin function (the one provided in <server root></server>/plugins/slapd/slapi/examples/testbind.c) enabled. I see even more rapid memory leakage than with my plugin.
Are there known issues with SLAPI memory management? Is there anything I can do other than restarting ns-slapd on a regular basis (in production, this memory leak causes VSS growth of several hundred MB in the course of a few days).

I think if you want to modify the result before it is returned, your plugin needs to be invoked post-op as well. Your plugin can be both at the same time, just make sure your init function knows what to do when called a second time.
Moreover, without looking at the stack trace, it is hard to make any progress. Do you still have the core file? Can you paste the pstack and pflags output ?
# Run "file" on the core to see if its a 32 or 64 bit core
# cd /path/to/ns-slapd
# pstack <corefile>
# pflags corefile
Alternatively, see if you can reproduce the problem with a small plugin. Smaller the better. I'll give it a go.

Errors in calling rmi methods

iPlanet6.1 is throwing following exceptions during rmi calls. Seems to be it is having problem in establishing t3 connections to the weblogic.
java.rmi.ConnectException: Connection to: 'wlserver1' over: 't3' g
ot an error or timed out
at weblogic.rjvm.ConnectionManager.ensureConnectionEstablished(Connectio
nManager.java:1272)
at weblogic.rjvm.ConnectionManager.getOutputStream(ConnectionManager.jav
a:1316)
at weblogic.rjvm.RJVMImpl.getRequestStream(RJVMImpl.java:348)
at weblogic.rmi.internal.BasicRemoteRef.getOutboundRequest(BasicRemoteRe
f.java:97)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:125)
at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:35)
=======
java.rmi.ConnectException: Attempt to sendMsg using a closed connection
at weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutboundR
equest.java:85)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:136)
at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:35)
We have to restart iplanet whenever we get this problem and then it works fine for 40min - 1hr and it repeats the problem again. But we could make t3 connections and call rmi methods on the appserver by a test program running out of webserver without any problem at the same time when iplanet was having problems.
Did anybody face this problem before?
Thanks.
Ashok

es5f2000 wrote:
jschell wrote:
That works?I dunno. The below definitely works, but like I said, I've only
ever done it with one output parameter (and that has always
been a ResultSet).
String callableQuery = "{?= call my_package.my_call(?, ?)}"
Yes I have done that and at least in terms of my code it wasn't just a result set.
But not with two.

Simple JSP leaks memory?

Simple HelloWorld.jsp leaks memory significantly. Tested with SoapUI setup with 40 clients driving load. At around invocation 100,000 the WLS server simply leaks enough memory to hit the upper heap size and dies. I'm running V10.3.2 (latest) in Production mode with the JRocket JVM. I also tried the same test with HelloWorld.HTML file and found no memory leaks, it runs HTML test fine up to 1,000,000 invocations with no memory or thread leaks.
This test can not be any simpler.
Also, performance goes down significantly as memory leaks! I go from 500tps down to 100tps just prior to running out of memory.
The JSP file is extremely simple, here's the code:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World JSP</title>
</head>
<body>
Hello World!
</body>
</html>
Why would such a simple JSP file cause the WebContainer to leak memory? I'm at a loss here.
Edited by: user9200447 on Feb 26, 2010 10:47 AM

It depends on the test being run. One possibility is it may be due to implicit session objects.
Try using session=false otherwise session objects are created implicitly for this jsp. Dependng on sesson timeout, hits and java heap memory size you can run out of memory
HTH

ClassDefiner.defineClass() leaking memory in a RMI method invocation.

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