[Building Sakai] Perm Gen Space Error

[Doreen Minich]

Good Morning,
Who has some suggestions to resolve a PermGen space error issue we continue to have on our server?  Seems we can keep our server up for two weeks straight without it crashing on the following error.  It's so bad we've started to keep a calendar and log the crashes.  
One of my co-workers has been working on this and has implemented many of the suggestions but nothing has been a fix yet.  We're hoping for new, not yet tried solutions that will be our final fix.  I've included a bunch of information below that may or may not be helpful.
.....
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org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: PermGen space at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:768) caused by: org.sakaiproject.tool.api.ToolException: PermGen space at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1221) caused by: javax.servlet.ServletException: PermGen space at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) caused by: javax.faces.FacesException: PermGen space at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:211) caused by: org.apache.jasper.JasperException: PermGen space at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393) caused by: javax.servlet.ServletException: PermGen space at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:774) caused by: java.lang.OutOfMemoryError: PermGen space user: admin usage-session: 76934120-87c7-4ca7-a4bb-c769fdff82c4 time: Nov 11, 2010 08:48:02

Above error copied from Gradebook. Same message visible in Calendar (on Home Page).  Users reporting slow response time. 
 
Available Memory: 238225096 (as listed in Admin Workspace/Memory)
 
>From Services
Mem: 4083952k total, 3739424k used, 344528 free, 580704k buffers
Swap: 4192924 total, 56k used, 4192868k free, 1146636k cached
java virt 1619m, 1.5g res, 21m shr, %cpu 3, %MEM 38.5 
 
I Reset All Caches (Admin Workspace/Memory)
Memory: 445121856
Reset of cache had no affect on PermGen Space Error
Java CPU % over 100 now
 
139 Sessions listed
 
TIA, Dorie
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