OAS Heap memory issue: An error "java.lang.OutOfMemoryError: GC overhead

OAS - 10.1.3.4.0
We are running out of Heap memory and seeing lots of full GC and out of memory events
Verbose GC is on.
Users don't know what they are doing to cause this
We have 30-40 users per server and 1.5 GB heap memory allocated
There are no other applications on the machine. Only the PRD instance with 1.5 GB allocated to the JVM. We do not have any issue with memory on the server and we could increase the heap but we dont want to go over the 1.5 GB since that is what I understood to be the high end of what is recommended. we only have 30-40 users on each machine. There are 8 servers and a typical heavy usage day we may have 1 or two machines that have the out of memory or continuous full GC in the logs. When this occurs the phones light up with the people on that machine experiencing slowness.
below is an example of what we see in a file created in the OPMN log folder on the JAS server then this occurs. I think this is the log created when Verbose GC is turned on. I can send you the full log or anything else you need. Thanks
1194751K->1187561K(1365376K), 4.6044738 secs]
java.lang.OutOfMemoryError: GC overhead limit exceeded
Dumping heap to java_pid10644.hprof ...
[Full GC 1194751K->1188321K(1365376K), 4.7488200 secs]
Heap dump file created [1326230812 bytes in 47.602 secs]
[Full GC 1194751K->1177641K(1365376K), 5.6128944 secs]
[Full GC 1194751K->986239K(1365376K), 4.6376179 secs]
[Full GC 1156991K->991906K(1365376K), 4.5989155 secs]
[Full GC 1162658K->1008331K(1365376K), 4.1139016 secs]
[Full GC 1179083K->970476K(1365376K), 4.9670050 secs]
[GC 1141228K->990237K(1365376K), 0.0561096 secs]
[GC 1160989K->1012405K(1365376K), 0.0920553 secs]
[Full GC 1012405K->1012274K(1365376K), 4.1170216 secs]
[Full GC 1183026K->1032000K(1365376K), 4.4166454 secs]
[Full GC 1194739K->1061736K(1365376K), 4.4009954 secs]
[Full GC 1194739K->1056175K(1365376K), 5.1124431 secs]
[Full GC 1194752K->1079807K(1365376K), 4.5160851 secs]
in addition to the 'overhead limit exceded' we also will see :
[Full GC 1194751K->1194751K(1365376K), 4.6785776 secs]
[Full GC 1194751K->1188062K(1365376K), 5.4413659 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5800033 secs]
[Full GC 1194751K->1194751K(1365376K), 4.4951213 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5227857 secs]
[Full GC 1194751K->1171773K(1365376K), 5.5696274 secs]
11/07/25 11:07:04 java.lang.OutOfMemoryError: Java heap space
[Full GC 1194751K->1183306K(1365376K), 4.5841678 secs]
[Full GC 1194751K->1184329K(1365376K), 4.5469164 secs]
[Full GC 1194751K->1184831K(1365376K), 4.6415273 secs]
[Full GC 1194751K->1174738K(1365376K), 5.3647290 secs]
[Full GC 1194751K->1183878K(1365376K), 4.5660217 secs]
[Full GC 1194751K->1184651K(1365376K), 4.5619460 secs]
[Full GC 1194751K->1185795K(1365376K), 4.4341158 secs]

There's an Oracle support note with a very similar MO :
WebLogic Server: Getting "java.lang.OutOfMemoryError: GC overhead limit exceeded" exception with Sun JDK 1.6 [ID 1242994.1]
If I search for "java.lang.OutOfMemoryError: GC overhead" on Oracle Support it returns at least 12 documents
Might be bug 6065704. Search Oracle support for this bug number.
Best Regards
mseberg

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Edited by: discovery_java on Feb 1, 2010 2:12 PM

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     at oracle.jheadstart.controller.strutsadf.action.JhsStrutsPageLifecycleFactory.getJSPLifeCycle(JhsStrutsPageLifecycleFactory.java:83)
     at oracle.jheadstart.controller.strutsadf.action.JSPLifecycleFactory.getPageLifecycle(JSPLifecycleFactory.java:40)
     at oracle.adf.controller.struts.actions.DataActionMapping.freeze(DataActionMapping.java:212)
     at org.apache.struts.config.impl.ModuleConfigImpl.freeze(ModuleConfigImpl.java:503)
     at org.apache.struts.action.ActionServlet.init(ActionServlet.java:474)
     at javax.servlet.GenericServlet.init(GenericServlet.java:258)
     at oracle.jheadstart.controller.strutsadf.JhsActionServlet.init(JhsActionServlet.java:195)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.HttpApplication.loadServlet(HttpApplication.java:2130)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.HttpApplication.findServlet(HttpApplication.java:4560)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2598)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:643)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:208)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:125)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (9.0.4.1.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
     at java.lang.Thread.run(Thread.java:534)
I configure mi app according to:
http://www.oracle.com/technology/products/jdev/collateral/papers/10g/as_supportmatrix.html
help me please...
Rigoberto

Rigoberto,
Can you apply the steps as documented by Steve Muench at
http://radio.weblogs.com/0118231/stories/2005/05/20/stepsToDeployJheadstartTutorialApplication.html
and see whether the problem persists?
Steven Davelaar,
JHeadstart Team.

Error "java.lang.OutOfMemoryError" When Returning Large Number of Docs

In our SES implementation, we have a custom search interface that allows users to search for documents and then add them to a "shopping cart". Users add then to their shopping cart from search results, by adding docs one-by-one or an Add All option. Once they are done "shopping" they create a report.
Here is the scenario...
Users are saerching for documents and seeing that on page 1, there is 1 - 10 of about 300 results. They clicked Add All and want all 300 docs added to their cart.
What we do under the covers is we execute another search and set the docs requested to 200. We get the array of docs, iterate over them and add the keys to a list. We found 200 docs at a time to be a safe number. However, there are still 100 docs that were not added to their cart and users want all 300 added. In other words, when they click Add All, they want to add all docs, 300, 500, 5000, etc.
I set the "Maximum Number of Results" to 500 and found that I can safely add up to ~ 350 docs at one time. However, going past this point throws the following error:
[SOAPException: faultCode=SOAP-ENV:Server; msg= [java.lang.OutOfMemoryError]]
     at oracle.search.query.webservice.client.OracleSearchService.makeSOAPCallRPC(OracleSearchService.java:941)
     at oracle.search.query.webservice.client.OracleSearchService.doOracleSearch(OracleSearchService.java:469)
After this error is thrown, SES was unable to recover and searching would not work anymore, even return 10 docs at a time. We had to restart SES to resolve the issue.
1. What is throwing this error? Is it the amount of XML being returned?
2. What is the maximum number of results we can get back at any one time? Is it based on the amount of data being returned or the number of attributes?
We are running 10.1.8 with plans to upgrade soon.
Thanks in advance.

I know it may be hard to throw away all this code, but consider using the jakarta fileupload component.
I think it would simplify your code down to
// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// Parse the request
List /* FileItem */ items = upload.parseRequest(request);
// Process the uploaded items
Iterator iter = items.iterator();
while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();
    if (item.isFormField()) {
        processFormField(item);
    } else {
        // item is a file. write it
        File saveFolder = application.getRealPath("/file");
        File uploadedFile = new File(saveFolder, item.getName());
        item.write(uploadedFile);
}Most of this code was hijacked from http://jakarta.apache.org/commons/fileupload/using.html
Check it out. It will solve your memory problem by writing the file to disk temporarily if necessary.
Cheers,
evnafets

Weblogic server start error: java.lang.OutOfMemoryError

Hi:
          when i start weblogic server, i met following error !
          java.lang.OutOfMemoryError
          <<no stack trace available>>
          why?
          thanks!
          starting output as follow :
          C:\bea7\user_projects\zhudomain>startweblogic
          C:\bea7\user_projects\zhudomain>echo off
          CLASSPATH=C:\bea7\jdk131_03\lib\tools.jar;C:\bea7\weblogic700\integration\li
          b\wl
          pi-worklist.jar;C:\bea7\weblogic700\samples\server\eval\pointbase\lib\pbserv
          er42
          ECF172.jar;C:\bea7\weblogic700\server\lib\weblogic_sp.jar;C:\bea7\weblogic70
          0\se
          rver\lib\weblogic.jar;
          PATH=.;C:\bea7\weblogic700\server\bin;C:\bea7\jdk131_03\bin;C:\PROGRA~1\RATI
          ONAL
          \RATION~1\NUTCROOT\bin;C:\PROGRA~1\RATIONAL\RATION~1\NUTCROOT\bin\x11;C:\PRO
          GRA~
          1\RATIONAL\RATION~1\NUTCROOT\mksnt;c:\Oracle\Ora81\bin;C:\WINNT\system32;C:\
          WINN
          T;C:\WINNT\System32\Wbem;C:\PROGRA~1\ULTRAE~1;C:\CTEX\MiKTeX\TeXMF\miktex\bi
          n;C:
          \CTEX\MiKTeX\LocalT~1\cct\bin;C:\Program Files\Rational\common;C:\Program
          Files\
          Rational\ClearQuest;C:\Program Files\Rational\Rose\TopLink\;C:\Program
          Files\Rat
          ional\Rational Test;C:\bea7\jdk131_03\bin
          * To start WebLogic Server, use a username and *
          * password assigned to an admin-level user. For *
          * server administration, use the WebLogic Server *
          * console at http://[hostname]:[port]/console *
          C:\bea7\user_projects\zhudomain>"C:\bea7\jdk131_03\bin\java" -hotspot -Xms32
          m -X
          mx200m -Dweblogic.security.SSL.trustedCAKeyStore=C:\bea7\weblogic700\server\
          lib\
          cacerts -Dweblogic.Name=myserver -Dbea.home="C:\bea7" -Dweblogic.management.
          user
          name= -Dweblogic.management.password= -Dweblogic.ProductionModeEnabled= -Dja
          va.s
          ecurity.policy="C:\bea7\weblogic700\server\lib\weblogic.policy"
          weblogic.Server
          <2002-11-13 ÏÂÎç04Ê±21·Ö01Ãë> <Info> <Security> <090065> <Getting boot
          identity
          from user.>
          Enter username to boot WebLogic server:system
          Enter password to boot WebLogic server:
          Starting WebLogic Server...
          <2002-11-13 ÏÂÎç04Ê±21·Ö08Ãë> <Notice> <Management> <140005> <Loading
          configurat
          ion C:\bea7\user_projects\zhudomain\.\config.xml>
          java.lang.OutOfMemoryError
          <<no stack trace available>>


Hi JLK,
Now as you can see that you are getting "java.lang.OutOfMemoryError: PermGen space" during the activation on an application it means that you are application needs more space in the non-heap part of the JVM which is PermGen to create the Classes, Class Structures, Methods and Reflection Objects of this applications hence you are getting this issue.
Now how to solve this issue you try the following check list which would help you resolve this issue and overcome same type of issue in future
1). Make Sure that the PermGen Area is not set to a very less value.
2). Usually if an Application has Many JSP Pages in that case every JSP will be converted to a *.class file before JSP Request Process. So a large number of JSPs causes generation of a Large number of *.class files all these classes gets loaded in the PermGen area.
3). While allocating the -XX:MaxPermSize make sure that you follow a rough Formula… which works in most of the Application Servers.
MaxPermSize = (Xmx/3) —- Very Special Cases (One Third of maximum Heap Size)
MaxPermSize = (Xmx/4) —- Recommended (One Fourth Of maximum Heap Size
To get more information on this I would suggest you to have look at the below link which would surely help you in this case
Topic: OutOfMemory Causes and First Aid Steps?
http://middlewaremagic.com/weblogic/?p=4464
Regards,
Ravish Mody

OAS Heap memory issue: An error "java.lang.OutOfMemoryError: GC overhead

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