Question

Java heap memory error

Asked by: arjunarajan

hi

SEVERE: Caught exception (java.lang.OutOfMemoryError: Java heap space) executing org.apache.jk.common.SocketConnection@1906e61, terminating thread

my web application runs well for full day. when it comes to peak hours its suddenly crashes with java heap memory error and totally hangs.
i use java 1.4, tomcat 5.5, mysql 5.

Once i restart tomcat mean its work fine.
Why this happen in regular. anyone kindly help me to sort out.

My system Memory is 1GB.

Thanks in Advance

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Asked On
2009-06-28 at 04:59:45ID24528217
Topics

Java Server Pages (JSP)

,

Java Servlets

Participating Experts
2
Points
125
Comments
16

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Answers

 

by: karanwPosted on 2009-06-28 at 05:53:47ID: 24731108

Please post code which is using socket connection.

 

by: ksivananthPosted on 2009-06-28 at 23:36:43ID: 24733987

>>My system Memory is 1GB.

whats your heap setting?

 

by: arjunarajanPosted on 2009-06-30 at 01:51:25ID: 24743447

my heap setting 256MB for JVM.
When at peak hours 150 t0 200 users can access the site and application continously

 

by: ksivananthPosted on 2009-06-30 at 02:50:33ID: 24743686

I think, 256MB is too low for 200 users... try increasing it to 786 and see if you still see the issue. if you still see the issue, you may want to run some profiler if there are any memory leaks!

 

by: arjunarajanPosted on 2009-06-30 at 02:55:52ID: 24743707

how to set JVM memory, i dont know as im new to JVM side.
i hope its a JVM problem ly as the application run for past two years it works fine but now the hits is increase only from one month i phase this issue.

i want to know how to set JVM memory in linux and windows. and where i find that value.
kindly guide me

 

by: ksivananthPosted on 2009-06-30 at 02:58:08ID: 24743714

 

by: arjunarajanPosted on 2009-06-30 at 03:03:35ID: 24743732

thats ok to set.. how i know before value that JVM uses...

 

by: ksivananthPosted on 2009-06-30 at 03:18:31ID: 24743793

>>how i know before value that JVM uses...

you have told 256MB is set already!

 

by: arjunarajanPosted on 2009-06-30 at 03:24:39ID: 24743822

ya that my server maintain people said.... i want to check mean.. any commands r any other tool identify that ya....

 

by: ksivananthPosted on 2009-06-30 at 04:02:29ID: 24743978

check the catalina.sh/bat file, they should have configured the heap settings there!

also checo if there are any env variable JAVA_OPTS defined that has heap settings!

 

by: arjunarajanPosted on 2009-06-30 at 22:08:48ID: 24751654

i checked u said files i didn't find anything like that .
we have a dedicated linux server. i want to cross check whether they set java heap memory or not. say where i can see that value.

 

by: arjunarajanPosted on 2009-07-12 at 01:11:07ID: 24833647

I finally fixed the problem by increasing the system memory.

 

by: ksivananthPosted on 2009-07-12 at 23:24:48ID: 24837509

increasing the system memory can not fix the issue, no matter how much memory your system has but JVM can use only what allocated for it. the only way to increase the memory for JVM is through the env variables like -Xms, -Xmx which I have asked him to do so earlier!

 

by: ksivananthPosted on 2009-07-13 at 23:09:37ID: 24846626

I recommend the below commentids to be accepted as answer,

ID:24743686
ID:24743714

20120131-EE-VQP-002

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