-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Chuck,
Caldarale, Charles R wrote: >> Subject: Re: Memory leaks on webapp redeploy >> >> The only thing I can think of is perhaps Java is keeping introspection >> information around and never releasing it. > > Quite possible. There's a good discussion of the issue here: > http://opensource.atlassian.com/confluence/spring/pages/viewpage.action? > pageId=2669 Yup; that's where I read about the Introspector.flushCaches trick. I use Velocity, not JSP, and I just checked the source code for their introspection code, and it does not appear to use the built-in Java Introspector, so that's unlikely to be the problem. Velocity is the only place that we use any introspection at all, so I'll be interested to see the results of profiling.... especially which objects are holding on to references to old Class objects. Maybe this issue has been fixed in recent VMs (IIRC, older VMs -- maybe 1.3-era -- would never discard java.lang.Class objects. Java 1.5 has the "-Xnoclassgc" option, which might exist to replicate this "feature" for apps which relied on Class objects living forever. For instance, if you had a singleton with a static instance of the class, but no references to the Class object, no instances other than the singleton (a reasonable assumption for a singleton), and no outside references to the singleton object, then the VM is within it's rights to discard both the instance and the Class since they are "unused". I seem to recall this being a problem for folks who thought that singletons were a good idea, and so the Java folks decided to keep Class objects around forever. Perhaps that changed. Anyone know about the history of this phenomenon? Or am I just crazy and making the whole thing up? ;) - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFbGTL9CaO5/Lv0PARAt2yAKCDRa6Mx0ojhSdyHfYmZkKLoVL6hACgikgU USkA4X4E2DIy9vk/Qwxs5d0= =/sNx -----END PGP SIGNATURE----- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
