DerbySystemGBean doesn't call System.gc() in doStop() and soFail() as
recommended in the Derby doco
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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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