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From "Matt Hogstrom (JIRA)" <...@geronimo.apache.org>
Subject [jira] Assigned: (GERONIMO-453) DerbySystemGBean doesn't call System.gc() in doStop() and soFail() as recommended in the Derby doco
Date Thu, 10 Nov 2005 19:25:03 GMT
     [ http://issues.apache.org/jira/browse/GERONIMO-453?page=all ]

Matt Hogstrom reassigned GERONIMO-453:
--------------------------------------

    Assign To: Matt Hogstrom  (was: John Sisson)

> DerbySystemGBean doesn't call System.gc() in doStop() and soFail() as recommended in
the Derby doco
> ---------------------------------------------------------------------------------------------------
>
>          Key: GERONIMO-453
>          URL: http://issues.apache.org/jira/browse/GERONIMO-453
>      Project: Geronimo
>         Type: Bug
>     Versions: 1.0-M4
>     Reporter: John Sisson
>     Assignee: Matt Hogstrom
>      Fix For: 1.0

>
> 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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