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From "Grzegorz Grzybek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KARAF-4686) ClassLoader leak with RmiRegistryFactory and sun.rmi.transport.tcp.TCPEndpoint
Date Wed, 31 Aug 2016 15:47:20 GMT
Grzegorz Grzybek created KARAF-4686:
---------------------------------------

             Summary: ClassLoader leak with RmiRegistryFactory and sun.rmi.transport.tcp.TCPEndpoint
                 Key: KARAF-4686
                 URL: https://issues.apache.org/jira/browse/KARAF-4686
             Project: Karaf
          Issue Type: Bug
            Reporter: Grzegorz Grzybek


Here's a leak I found in JVisualVM.
{noformat}
this     - value: org.apache.felix.framework.BundleWiringImpl #3
 <- m_wiring     - class: org.apache.felix.framework.BundleWiringImpl$BundleClassLoaderJava5,
value: org.apache.felix.framework.BundleWiringImpl #3
  <- <classLoader>     - class: org.apache.karaf.management.RmiRegistryFactory$KarafServerSocketFactory,
value: org.apache.felix.framework.BundleWiringImpl$BundleClassLoaderJava5 #3
   <- <class>     - class: org.apache.karaf.management.RmiRegistryFactory$KarafServerSocketFactory,
value: org.apache.karaf.management.RmiRegistryFactory$KarafServerSocketFactory class RmiRegistryFactory$KarafServerSocketFactory
    <- ssf     - class: sun.rmi.transport.tcp.TCPEndpoint, value: org.apache.karaf.management.RmiRegistryFactory$KarafServerSocketFactory
#1
     <- key     - class: java.util.HashMap$Entry, value: sun.rmi.transport.tcp.TCPEndpoint
#9
      <- next     - class: java.util.HashMap$Entry, value: java.util.HashMap$Entry #19809
       <- [0]     - class: java.util.HashMap$Entry[], value: java.util.HashMap$Entry #28136
        <- table     - class: java.util.HashMap, value: java.util.HashMap$Entry[] #4031
         <- localEndpoints (sticky class)     - class: sun.rmi.transport.tcp.TCPEndpoint,
value: java.util.HashMap #4065
{noformat}

sun.rmi.transport.tcp.TCPEndpoint has non-weak map that keeps references to socket factories:
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/48c99b423839/src/share/classes/sun/rmi/transport/tcp/TCPEndpoint.java#l148

This prevents cleaning up classloader of {{org.apache.karaf.management.server}} bundle.



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