Some short answers : - (for the moment) threads are always reused, even after an application is stopped. - tomcat 6.0.26 tries to clean the threadlocals which may provoke a leak, but 1) it was unsafe and has been disabled by default from 6.0.27 (see https://issues.apache.org/bugzilla/show_bug.cgi?id=48895 ) and 2) some leak through threadlocals might not be detected and thus not cleared, as explained in http://wiki.apache.org/tomcat/MemoryLeakProtection#webappClassInstanceAsThreadLocalIndirectValue - To improve over this situation, threads are now being renewed after an application is stopped. This change is currently only in SVN trunk for tomcat 7. See https://issues.apache.org/bugzilla/show_bug.cgi?id=49159 - please upgrade to 6.0.29 and post the logs again. There has been some improvement in the diagnostics.
Sylvain On 11 déc. 2010, at 21:01, Srikanth Konjarla wrote: > Pid, > > Thanks for your patience. Here is the output from catalina.out file > while the webapp is being undeployed. As you can see there are few > threadLocals that are cleaned up. > > ---------------------------------------------------------------------- > Dec 10, 2010 8:46:56 PM org.apache.catalina.loader.WebappClassLoader > clearThreadLocalMap > SEVERE: A web application created a ThreadLocal with key of type > [java.lang.ThreadLocal] (value [java.lang.threadlo...@7ee75db3]) and a > value of type [org.apache.catalina.loader.WebappClassLoader] (value > [WebappClassLoader > delegate: false > repositories: > /WEB-INF/classes/ > ----------> Parent Classloader: > org.apache.catalina.loader.standardclassloa...@1eb3319f > ]) but failed to remove it when the web application was stopped. To > prevent a memory leak, the ThreadLocal has been forcibly removed. > Dec 10, 2010 8:46:56 PM org.apache.catalina.loader.WebappClassLoader > clearThreadLocalMap > SEVERE: A web application created a ThreadLocal with key of type > [java.lang.ThreadLocal] (value [java.lang.threadlo...@7ee75db3]) and a > value of type [org.apache.catalina.loader.WebappClassLoader] (value > [WebappClassLoader > delegate: false > repositories: > /WEB-INF/classes/ > ----------> Parent Classloader: > org.apache.catalina.loader.standardclassloa...@1eb3319f > ]) but failed to remove it when the web application was stopped. To > prevent a memory leak, the ThreadLocal has been forcibly removed. > Dec 10, 2010 8:46:56 PM org.apache.catalina.loader.WebappClassLoader > clearThreadLocalMap > SEVERE: A web application created a ThreadLocal with key of type > [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value > [org.apache.xml.security.utils.unsyncbytearrayoutputstrea...@775d1479]) > and a value of type [byte[]] (value [...@5faeed4]) but failed to remove > it when the web application was stopped. To prevent a memory leak, the > ThreadLocal has been forcibly removed. > Dec 10, 2010 8:46:56 PM org.apache.catalina.loader.WebappClassLoader > clearThreadLocalMap > SEVERE: A web application created a ThreadLocal with key of type > [org.apache.axis.utils.XMLUtils.ThreadLocalDocumentBuilder] (value > [org.apache.axis.utils.xmlutils$threadlocaldocumentbuil...@3a0ee334]) > and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value > [org.apache.xerces.jaxp.documentbuilderi...@61583db6]) but failed to > remove it when the web application was stopped. To prevent a memory > leak, the ThreadLocal has been forcibly removed. > ------------------------------------------------------------------------ > > Srikanth --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
