Permgen Memory Leak dengan hot redeploy dan database Oracle

Coba pindahkan driver Oracle JDBC ke direktori lib Tomcat alih-alih berada di dalam folder lib aplikasi. Sepertinya OracleDiagnosabilityMBean menguasai Catalina.

Sunting:Karena Anda tidak memiliki kendali atas Tomcat, coba bungkus tempat kelas Oracle dimuat seperti itu (kecuali ganti AppContext untuk init Oracle Anda):

http://cdivilly.wordpress.com/2012/04/ 23/permgen-memory-leak/

//somewhere in application startup, e.g. the ServletContextListener
try {
 final ClassLoader active = Thread.currentThread().getContextClassLoader();
 try {
  //Find the root classloader
  ClassLoader root = active;
  while (root.getParent() != null) {
   root = root.getParent();
  }
  //Temporarily make the root class loader the active class loader
  Thread.currentThread().setContextClassLoader(root);
  //Force the AppContext singleton to be created and initialized
  sun.awt.AppContext.getAppContext();
 } finally {
 //restore the class loader
 Thread.currentThread().setContextClassLoader(active);   
}
} catch ( Throwable t) {
   //Carry on if we get an error
   LOG.warning("Failed to address PermGen leak");
}