https://bz.apache.org/bugzilla/show_bug.cgi?id=58918
Bug ID: 58918
Summary: JNDI datasources shouldn't get the WebappClassLoader
as their context ClassLoader when initializing
Product: Tomcat 8
Version: 8.0.30
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: yushijin...@gmail.com
I use a JNDI datasource and put the mysql Connector/J driver in the
$CATALINA_HOME/lib. When I undeploy a web application, I got a warning:
24-Jan-2016 20:26:52.254 WARNING [http-nio-8080-exec-5]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web
application [] appears to have started a thread named [Abandoned connection
cleanup thread] but has failed to stop it. This is very likely to create a
memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
The reason is that Tomcat didn't set the thread context ClassLoader before
initializing JNDI datasources, so the mysql driver gets a WebappClassLoader as
its context ClassLoader. And then the [Abandoned connection cleanup thread]
(created by mysql Connector/J) keeps a reference of the WebappClassLoader. This
causes a memory leak.
The suggest is to set the thread context ClassLoader to the container
ClassLoader before initializing JNDI datasources. So they will get the
container's ClassLoader as the context ClassLoader. Because JNDI datasources
are global, they shouldn't be initialized with a ClassLoader of a webapp.
I found a mailing list archive which tells the same bug:
<https://mail-archives.apache.org/mod_mbox/tomcat-users/201305.mbox/%3c51a8c44d.8040...@christopherschultz.net%3E>.
Sorry for my English;)
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