Java JVM outof memory - Thread blocks..

Hi,
I am running web application on Apache/tomcat with MySQL5.0.46 database. Application server running witout any problem for 2 days and having around 100 threads. One of my threads throws OutOfMemory Exception,
Exception in thread "MainSocketSession-10.229.6.51" 20:34:12:956 PM java.lang.OutOfMemoryError: Java heap space
I have enabled the -XX:+HeapDumpOnOutOfMemoryError in my application and set the MaX Heap size as 200M. While OutOfMemory erxception thrown, it will wrote hprof file and Java Heap Size is around 38 MB. {color:#3366ff}*Eventhough Heap size exceed, the above thread throws OutOfMemory exception. Why it throws outofmemory??.* {color} Even after outofmemory exception, my application will working fine.
Can you anyone please any one explain why that thread throws OutOfMemory error.
{color:#0000ff}*Heap Size is 38 MB.*
Max Heap Size is set as 200 MB.. but MainSocketSession throws OutOfMemory error, why??
How to analyze and fix this?? .. If you need any additional info .. I will provide you...{color}
Thanks
R.Ravikumar

SmartRavi wrote:
I am running web application on Apache/tomcat with MySQL5.0.46 database. Application server running witout any problem for 2 days and having around 100 threads. One of my threads throws OutOfMemory Exception,Is this running on a Sun JRE or JDK? What version?
Exception in thread "MainSocketSession-10.229.6.51" 20:34:12:956 PM java.lang.OutOfMemoryError: Java heap space
I have enabled the -XX:+HeapDumpOnOutOfMemoryError in my application and set the Max Heap size as 200M. When OOME is thrown, it will wrote hprof file and Java Heap Size is around 38 MB. Even though Heap size exceed, the above thread throws OOME. Why it throws OOME? Even after OOME, my application will working fine.
Can you anyone please any one explain why that thread throws OOME.
Heap Size is 38 MB.
Max Heap Size is set as 200 MB.. but MainSocketSession throws OOME, why??
How to analyze and fix this?Set -Xmx=200m -Xms=200mto rule out the JVM only asking for memory later, when the OS does not have any to give.
If your application decides to allocate a large object (as an example int[50000000] would take 200m)
you will get OOME - the heap will be unaffected (well, a GC cycle will have happened).

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4. and creates (dynamically) and starts a C++ Thread ( that uses the Win API ) giving it the former created object as parameter.
Following the C++ thread uses the former stored global JavaVM to get a JNIEnv. It also uses the global stored object.
After this I prepare for executing a callback to Java, e.g. AttachCurrentThread, GetObjectClass, GetMethodID and so on. Finally I sucessfully start some callbacks to Java (in the while loop of the thread).
Now here is my Problem:
The described way only works for a few calls and then raises an error. "java.exe hat ein Problem festgestellt und muss beendet werden." (german os) (In english it should be: "java.exe has detected a problem and has to be determined").
What is wrong with my idea. It is something with the scope of my dynammically created objects? If have no idea anymore.
Here the source code (C++ part):
#include <jni.h>
#include "benchmark.h"
#include "bench.h"
#include "canMessage.h"
JavaVM *jvm;
jobject javaObject;
JNIEXPORT void JNICALL Java_Benchmark_startBench(JNIEnv *env, jobject obj, jobject obj2){
     env->GetJavaVM(&jvm);
     javaObject = obj2;
     cout << "\n C++ Starting benchmark\n\n";
     Benchmark *bm = new Benchmark();
     Thread *thread = new Thread(bm);
     thread->start();
     //thread->join(); //uncomment this there will be no error but also
                                     // no java thread doing it's job
Benchmark::Benchmark(): _continue(false) {
Benchmark::~Benchmark(){
unsigned long Benchmark::run(){
     _continue = true;
     JNIEnv *jniEnv;
        jvm->AttachCurrentThread((void **)&jniEnv, NULL);
        jclass javaClass = jniEnv->GetObjectClass(javaObject);
     if(javaClass == NULL){
          cout << "--> Error: javaClass is null";
     jmethodID methodId = jniEnv->GetMethodID(javaClass, "addMessage", "(Ljava/lang/String;)V");
     if(methodId == NULL){
          cout << "--> Error: methodId is null";
     string str ("This is a test text.");
     const char *cStr = str.c_str();
     jstring javaString = jniEnv->NewStringUTF(cStr);
     jniEnv->CallVoidMethod(javaObject, methodId, javaString );
     int i_loopCount = 0;
     while(_continue){
          i_loopCount++;
          cout << i_loopCount << " C++ runing\n";
          jniEnv->MonitorEnter(javaObject);
          jniEnv->CallVoidMethod(javaObject, methodId, javaString );
          jniEnv->MonitorExit(javaObject);
          canMessage = new CANMessage();
          delete canMessage;
          canMessage = NULL;
     return 0;
void Benchmark::stop(){
     _continue = false;
}Is there a better and more elegant way to solve my problem?
Thanks!

At
http://codeproject.com/cpp/OOJNIUse.asp
http://www.simtel.net/product.php[id]93174[sekid]0[SiteID]simtel.net
http://www.simtel.net/product.php[id]94368[sekid]0[SiteID]simtel.net
you will find examples how to implement Java Interface in JNI C++ without Java coding.
At
http://www.simtel.net/product.php[id]95126[sekid]0[SiteID]simtel.net
you can get pure JNI interface for DOTNET.

How to increase jvm heap memory

hello all,
we r facing "outofmemory" exception. could any one kindly help us in increasing the jvm's memory in runtime.
thanks alot
raghu

use java with -Xms and -Xmx options.
see http://java.sun.com/j2se/1.4/docs/tooldocs/windows/java.html
nk

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Hello,
In my code I want to check JVM used memory and dump to a log file. Is any way to do that?
Thx a lot!
SG

Ok, you've been a forum member for how long? Anyway, look at the javadocs:
http://java.sun.com/j2se/1.4.2/docs/api/
See the Runtime class.

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Hello.
I have a server application that employs java.nio.channels with non-blocking sockets.
The server waits for connections. The client should connect and be first in sending data.
Timeouts are significant! If client exceeds the allowed time to send data, the server should break the connection.
The huge trouble I've discovered that I cannot control the timeout when client connects but remains silent.
My code looks as follows:
<pre>
Selector oSel;
SocketChannel oSockChan;
Socket oSock;
SelectionKey oSelKey;
Iterator<SelectionKey> oItSelKeys;
int iCurrState, iMask, iCount;
iCurrState = INT_SERVER_WORKING;
iMask = SelectionKey.OP_ACCEPT | SelectionKey.OP_CONNECT | SelectionKey.OP_READ | SelectionKey.OP_WRITE;
while ( iCurrState == INT_SERVER_WORKING )
try
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if ( iCount > 0 )
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oItSelKeys.remove();
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oSockChan.configureBlocking(false);
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oSelKey.interestOps(0);
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this.getReader().add(oSelKey); *// sending key to reading thread*
break;
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</pre>
Timeouts are easily controlled by reading and writing threads (see OP_READ and OP_WRITE ).
But when a client just connects without consequent data send, the state of this connection remains as OP_ACCEPT. The connection remains open for arbitrarily large time and I cannot control it!
Please help with idea how can I terminate such connections!

How can I process the keys that weren't selected at the bottom of the loop? Should I use the method keys() ?Yes. Form a new set from keys() and removeAll(selectedKeys()). Do that before you process selectedKeys().
And the second moment: as I understood a single key may contain several operations simultaneously? Thus I should use several if's (but not if/else 'cause it's the equivalent of switch ... case ).If there is anything unclear about 'your switch statement is invalid. You need an if/else chain' I fail to see what it is. Try reading it again. And if several ifs were really the equivalent of "switch ... case", there wouldn't be a problem in the first place. They're not, and there is.

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Hi Experts,
An Application of Webservices developed in Jdeveloper 10.1.2.2.0 and has been Deployed on Oracle Application Server 10g.
Problem has been faced when the requests sent by the client program and no of requests increased to 1600 (estimated requests), then it shows the below error.
ASOAPException:faultcode=SOAPENV:Server; msg=ajava.lang.outof Memory Error”
Please guide us to resolve this irritating issue.
Reply will be Appriciated.
Muhammad Shahzad Baig
Software Engineer

Hi.
First - I'd try to raise the application's -Xmx to something more than 32M. perhaps 64M.
Now, there are two possible causes here:
1 - your application is working ok, but it needs more memory than what the JVM can provide it with at a point of time. If that's the case - raising the -Xmx for the application will take care of it. (This is assuming there are no memory leaks in it).
2 - your application has memory leaks in it - fix it.
You can't catch OutOfMemory - it's not an exception raised in your program. It's raised in the JVM.
Nimo.

Does Solaris10 for x86 allow me to set java jvm heap size up to 3G

Does Solaris10 for x86 allow me to set java jvm heap size up to 3G,is it really true solaris only take 512M memory address space?I can only set 2668M(2.5G)on linux cause linux kernel take 1G memory address space.Thanks~~

[url http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runtime.html]Runtime seems to have some useful methods...

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