Confluence crashes with java.lang.OutOfMemoryError

Confluence regularly crashes. It used to be during every weekday during peak time, but after setting org.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER, Confluence started to crash once every week during peak time. See bellow for the current memory status.

It also looks like the scheduler has some relationship with the crash. This makes me believe it is related to the issue http://jira.atlassian.com/browse/CONF-3828.

It is not at all acceptable for Confluence to crash regularly.

Current memory status:
Total Memory 668 MB
Free Memory 455 MB
Used Memory 213 MB

Exception in thread "DefaultQuartzScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:38:44 AM org.apache.coyote.http11.Http11Processor process
SEVERE: Error processing request
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:00 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:09 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:23 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:34 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:45 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:39:56 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:40:08 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:40:20 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:40:31 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:40:45 AM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.OutOfMemoryError: PermGen space
Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0" java.lang.OutOfMemoryError: PermGen space
Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2" java.lang.OutOfMemoryError: PermGen space
Exception in thread "Timer-0" java.lang.OutOfMemoryError: PermGen space
Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1" java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 2:41:54 AM org.apache.tomcat.util.net.PoolTcpEndpoint processSocket
SEVERE: Unexpected error processing socket
java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8081-Processor14" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8081-Processor2" java.lang.OutOfMemoryError: PermGen space
Exception in thread "http-8081-Processor10" java.lang.OutOfMemoryError: PermGen space
Feb 13, 2008 4:58:47 AM org.apache.coyote.http11.Http11BaseProtocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8081
Exception in thread "Thread-23" java.lang.OutOfMemoryError: PermGen space
Exception in thread "Thread-17" java.lang.OutOfMemoryError: PermGen space