Cris: Couple of things here.
First, you can use in any Java 6 Update 45 and above the Java Visual VM, to monitor in real time the memory utilization done by the Java virtual machine. This will show you both the Help and Perm Gen memory graphs. You can find this tool in the bin directory of any JDK. Second, you can issue some Java parameters to actually enlarge the PermGen memory allocation upon startup. Please refer to your java version documentation on Oracle and lookup for the -XX parameters. You can start by enlarging your PermGen space and the monitor on the Visual VM the behavior, if you consistently run out of memory, then you may have a leak. Of course that you would be constrained by the fact of running a 32-bit or 64-bit Tomcat / Java environment. On Fri, Jul 15, 2016 at 2:26 AM, Berneburg, Cris J. - US < cberneb...@caci.com> wrote: > Hi Folks > > I got this error from the Tomcat Web Application Manager after having > stopped and started one of the applications multiple times. (This was > after repeatedly deploying the application manually to attempt to find a > bug that I could not reproduce in my IDE.) Once the error occurred, the > server was extremely sluggish to respond even to remote desktop mouse and > keyboard events. > > FYI, I deploy the app by stopping it on the Tomcat web manager, deleting > almost everything out of the app folder using file manager, copying the new > files and folders in, then starting the app from the Tomcat manager. > > Here's the error: > > FAIL - Application at context path /someapp could not be started > FAIL - Encountered exception java.lang.OutOfMemoryError: PermGen space > > Is this likely due to a memory leak in my application? Or does it have > something to do with me doing so many repeated deployments? Or perhaps > simply from restarting the app so many times? I might try an experiment to > see how many times I can stop/start the app before the error next occurs. > > OS: Win Server 2012 R2 > Java: 1.6.0_24 (oops, need to upgrade that now) > Tomcat: 6.0.37 (hmm... will need to upgrade soon-ish) > > -- > Cris Berneburg, Lead Software Engineer, CACI > >
