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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-952) Utilize Sun JDK's Attach API to dynamically load the OpenJPA enhancer agent
Date Tue, 03 Mar 2009 20:40:56 GMT
Utilize Sun JDK's Attach API to dynamically load the OpenJPA enhancer agent
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                 Key: OPENJPA-952
                 URL: https://issues.apache.org/jira/browse/OPENJPA-952
             Project: OpenJPA
          Issue Type: Improvement
          Components: kernel
    Affects Versions: 2.0.0
         Environment: Sun 1.6 JDK. 

Note: The Attach API is ONLY a part of the JDK, not the SDK.
            Reporter: Rick Curtis


When running in a JSE environment, OpenJPA could use the Attach API to dynamically load the
enhancer agent at runtime. Dynamically loading the enhancer means that an OpenJPA developer
doesn't need to configure a -javaagent. Doing this would dramatically improve the out of box
performance, and also improve the ease of use. 

This improvement has the following caveats:
1.) This API is ONLY a part of the 1.6 JDK.
2.) This API is supported by only the Sun JDK.
3.) If the agent is loaded from the earliest OpenJPA code, the agent will be laoded when creating
an EntityManager in the EntityManagerFactoryImpl. If an Entity class is loaded by the JVM
before the enhancer agent is loaded, that class' byte code will not be enhanced. 

Attach API - http://java.sun.com/javase/6/docs/technotes/guides/attach/index.html

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