I got this error last day when try to open an jsp page,
server is Tomcat5.5 and os is linux
I found this link http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-permgen-space/ it was very helpful to fix the issue
JAVA_OPTS="$JAVA_OPTS -XX:MaxPermSize=256m"
2.
You can create jsp page with the following code to evalute your memory details
# <%@ page import="java.lang.management.*, java.util.*" %><%
# response.setContentType("text/html");
# Iterator iter = ManagementFactory.getMemoryPoolMXBeans().iterator();
# while(iter.hasNext()){
# MemoryPoolMXBean item = (MemoryPoolMXBean) iter.next();
# MemoryUsage mu = item.getUsage();
# long used = mu.getUsed();
# long committed = mu.getCommitted();
# long max = mu.getMax();
# %>
# MEMORY TYPE: <%=item.getName()%>
# Used: <%=used%>
# Committed: <%= committed%>
# Max: <%=max%>
# <%}%>
The output look like
localhost
MEMORY TYPE: Code Cache
Used: 4 mb
Committed: 4 mb
Max: 48 mb
------------------------------------
MEMORY TYPE: PS Eden Space
Used: 25 mb
Committed: 33 mb
Max: 54 mb
------------------------------------
MEMORY TYPE: PS Survivor Space
Used: 0 mb
Committed: 1 mb
Max: 1 mb
------------------------------------
MEMORY TYPE: PS Old Gen
Used: 10 mb
Committed: 227 mb
Max: 455 mb
------------------------------------
MEMORY TYPE: PS Perm Gen
Used: 14 mb
Committed: 16 mb
Max: 64 mb
------------------------------------
After add this code JAVA_OPTS="$JAVA_OPTS -XX:MaxPermSize=256m"
I got PS Perm Gen size as
MEMORY TYPE: PS Perm Gen
Used: 14 mb
Committed: 16 mb
Max: 256 mb
