Around 9/6/16 Chris Schultz replied to the "WAR isolation lifecycle" thread with:
> There are some libraries that don't shut down well, or the applications > that use them don't properly shut them down. The solution is to either > fix the library (ask them!), or use Tomcat's "leak prevention listener" > to pre-load those classes that represent a problem. > > http://tomcat.apache.org/tomcat-8.0-doc/config/listeners.html#JRE_Memory_Leak_Prevention_Listener_-_org.apache.catalina.core.JreMemoryLeakPreventionListener > > You want to read about the "classesToInitialize" attribute. Having recently dealt with some memory leaks, I was curious and read through. Great! This might help in future struggles. However, being still somewhat new to this, I was unable to determine how to invoke the classesToInitialize parameter inside the server.xml from the documentation page. Googling around led to this: http://stackoverflow.com/questions/11872316/tomcat-guice-jdbc-memory-leak#19027873 The critical part is: > In tomcat/conf/server.xml, modify (inside the Server element): > <Listener > className="org.apache.catalina.core.JreMemoryLeakPreventionListener" /> > > to > > <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" > classesToInitialize="com.mysql.jdbc.NonRegisteringDriver" /> Aha, that's the XML syntax! Why didn't I know that? So, could we add a small example server.xml snippet to the JreMemoryLeakPreventionListener documentation to make it clear to newbies how to add the classesToInitialize option? Something like: <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" classesToInitialize="oracle.jdbc.driver.OracleTimeoutThreadPerVM" /> Is this also valid? <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"> <classesToInitialize>oracle.jdbc.driver.OracleTimeoutThreadPerVM</classesToInitialize> </Listener> Would examples look better after the Attribute/Description table as a separate section or embedded directly within the table? -- Cris Berneburg Lead Software Engineer, CACI
