Getting java.lang.OutOfMemoryError when updating our application

Question

Hi Experts,
When we update our application which is an heavy EAR file we get the following errors in the logs. But the same applications works well when we deploy it for the first few times why is this happening we have enough space in RAM still we get this error and when we restart our server it again works for sometime.
ServletContext@16428923[app:jccrbxt module:jccrbxt path:/jccrbxt spec-version:null]] Root cause of ServletException.
java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:328)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:285)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:253)
at weblogic.servlet.jsp.JspClassLoader.findClass(JspClassLoader.java:48)
at weblogic.servlet.jsp.JspClassLoader.loadClass(JspClassLoader.java:33)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:531)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:281)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:216)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:243)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)
at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174)
at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277)
at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:192)
at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
at org.springframework.security.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:99)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:527)
at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253)
Thanks

Answer 1

Hi,
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
Point-1). Make Sure that the PermGen Area is not set to a very less value.
Point-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.
Point-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