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From "Janko Heilgeist (JIRA)" <j...@apache.org>
Subject [jira] Created: (GERONIMO-4545) TomcatJAASRealm keeps reference to undeployed EAR/WAR's classloader
Date Thu, 19 Feb 2009 09:53:01 GMT
TomcatJAASRealm keeps reference to undeployed EAR/WAR's classloader
-------------------------------------------------------------------

                 Key: GERONIMO-4545
                 URL: https://issues.apache.org/jira/browse/GERONIMO-4545
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
    Affects Versions: 2.2
            Reporter: Janko Heilgeist


Another issue where an undeployed WAR's classloader is not GCed.

{code}
--> org.apache.geronimo.tomcat.realm.TomcatJAASRealm@0x2aaab10ab438 (180 bytes)  (field
container:) exclude
--> org.apache.geronimo.tomcat.GeronimoStandardContext@0x2aaab322d390 (749 bytes) (field
parentClassLoader:) exclude
--> org.apache.geronimo.kernel.config.MultiParentClassLoader@0x2aaab2e9b2e0 (156 bytes)
(field parents:) exclude
--> [Ljava.lang.ClassLoader;@0x2aaab0b97958 (88 bytes) (Element 1 of [Ljava.lang.ClassLoader;@0x2aaab0b97958:)
exclude
--> org.apache.geronimo.kernel.config.ChildrenConfigurationClassLoader@0x2aaab05e8bc0 (115
bytes) (field parent:) exclude
--> org.apache.geronimo.kernel.config.MultiParentClassLoader@0x2aaab2e9b230 (156 bytes)
exclude 
{code}

It looks to me like the TomcatJAASRealm (its name is "DefaultJAASRealm") is a standard realm
that is used by all WARs without explicit configuration. Setting the realm of a GeronimoStandardContext
makes the context store a reference to its realm AND makes the realm store a reference to
the context (see org.apache.catalina.core.ContainerBase#setRealm() which GeronimoStandardContext
inherits). Thus, the default realm's reference is always directed to the context of the WAR
deployed most recently. This reference keeps the context from being GCed even if the corresponding
WAR has been undeployed in the meantime.

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