https://issues.apache.org/bugzilla/show_bug.cgi?id=55674
Bug ID: 55674
Summary: ThreadLocal memory leak clean-up causes huge log
Product: Tomcat 7
Version: 7.0.42
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
ThreadLocal memory leak detection code is fine, but when it tries to clean-up
ThreadLocal maps, it prints something like this in catalina.out:
Oct 18, 2013 2:32:59 PM org.apache.catalina.loader.WebappClassLoader
checkThreadLocalMapForLeaks
SEVERE: The web application [/...] created a ThreadLocal with key of type [...]
(value [...]) and a value of type [java.text.SimpleDateFormat] (value
[java.text.SimpleDateFormat@6b2ed43a]) but failed to remove it when the web
application was stopped. Threads are going to be renewed over time to try and
avoid a probable memory leak.
Now, if the object contained in the ThreadLocal is very big and the toString
method dumps all the data of that object, log could become very huge. Eg, in
our application, we store a big HashMap in ThreadLocal and the trace above is
about 700Mb because it recursively calls toString methods of all objects
contained in the map.
Is it necessary to log values contained in ThreadLocal maps during clean-up
process?
Additionaly, log level for that message is set to SEVERE and there's no way to
specify logging details for that message.
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