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From "John Sisson (JIRA)" <...@geronimo.apache.org>
Subject [jira] Created: (GERONIMO-453) DerbySystemGBean doesn't call System.gc() in doStop() and soFail() as recommended in the Derby doco
Date Mon, 08 Nov 2004 00:41:33 GMT
DerbySystemGBean doesn't call System.gc() in doStop() and soFail() as recommended in the Derby
doco
---------------------------------------------------------------------------------------------------

         Key: GERONIMO-453
         URL: http://nagoya.apache.org/jira/browse/GERONIMO-453
     Project: Apache Geronimo
        Type: Bug
    Reporter: John Sisson


The Derby doco in the section "Shutting Down the System" at http://incubator.apache.org/derby/manuals/develop/develop12.html
says the following:

    Typically, an application using an embedded Derby engine shuts down Derby just before
shutting itself down.
    However, an application can shut down Derby and later restart it in the same JVM session.

    To restart Derby successfully, the JVM needs to unload org.apache.derby.jdbc.EmbeddedDriver,

    so that it can reload it when it restarts Derby. (Loading the local driver starts Derby.)

    You cannot explicitly request that the JVM unload a class, but you can ensure that the
EmbeddedDriver 
    class is unloaded by using a System.gc() to force it to garbage collect classes that are
no longer needed.
    Running with -nogc or -noclassgc definitely prevents the class from being unloaded and
makes you unable
    to restart Derby in the same JVM.

Anyone have any objections to the recommendation of calling System.gc()?



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