When I deploy webapp with liquidform.jpa in WEB-INF/lib and use it in application, than on undeploy there will be memory leak.
This is output from tomcat 6.0.29 log:
19-Nov-2010 10:38:12.533 SEVERE
org.apache.catalina.loader.WebappClassLoader.clearThreadLocalMap The web application [/xxxxx] created a ThreadLocal with key of type [null] (value [com.google.code.liquidform.internal.AliasFactory$1@16895ad]) and a value of type [com.google.code.liquidform.internal.WeakIdentityHashMap] (value [com.google.code.liquidform.internal.WeakIdentityHashMap@7c52f6]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Look for example similar issue at https://issues.apache.org/jira/browse/LANG-586