possible memory leak when stopping webapp

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Oct 26, 2010 9:23:21 PM org.apache.catalina.loader.WebappClassLoader 
clearReferencesJdbc
SEVERE: The web application [/hunglish-0.1.0-SNAPSHOT] registered the JBDC 
driver [com.mysql.jdbc.Driver] but failed to unregister it when the web 
application was stopped. To prevent a memory leak, the JDBC Driver has been 
forcibly unregistered.
Oct 26, 2010 9:23:21 PM org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: The web application [/hunglish-0.1.0-SNAPSHOT] appears to have started 
a thread named [Timer-1] but has failed to stop it. This is very likely to 
create a memory leak.
Oct 26, 2010 9:23:21 PM org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: The web application [/hunglish-0.1.0-SNAPSHOT] appears to have started 
a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. 
This is very likely to create a memory leak.
Oct 26, 2010 9:23:21 PM org.apache.catalina.loader.WebappClassLoader 
clearThreadLocalMap
SEVERE: The web application [/hunglish-0.1.0-SNAPSHOT] created a ThreadLocal 
with key of type 
[org.aspectj.runtime.internal.cflowstack.ThreadStackFactoryImpl.ThreadStackImpl]
 (value 
[org.aspectj.runtime.internal.cflowstack.ThreadStackFactoryImpl$ThreadStackImpl@
2ff3fb]) and a value of type [java.util.Stack] (value [[]]) but failed to 
remove it when the web application was stopped. This is very likely to create a 
memory leak.
log4j:ERROR LogMananger.repositorySelector was null likely due to error in 
class reloading, using NOPLoggerRepository.

Original issue reported on code.google.com by bpgergo on 26 Oct 2010 at 7:24