I have run into issues surrounding xwork and the reloading of classes using hot deploy. My deployment environment is JBoss, where I am sharing the webwork/xwork libraries between ears (to keep the ear file size down) and using a separate loader repository for each ear (to keep the configurations separated by classloader namespace).
The problem comes with the flag, webwork.configuration.xml.reload. When set to false, xwork holds on the xwork.xml file (loaded by a classloader) even after a hot redeploy. This causes all the classes loaded by that classloader to remain accessible as well, and the hot redeploy fails in the sense that the deployed classes do not change, and neither does the xwork configuration. (This would not happen if I bundled the xwork/webwork libraries into the ear/war, at the cost of a much larger ear file size.)
If the flag is true, hot redeploy works fine, but com.opensymphony.work.config.ConfigurationManager reloads xwork.xml on every request to the server.
I would like to be in a situation where I can hot deploy to a production server, to avoid having to drop all the deployments and restart the server just to update one. However, I am concerned as to the additional load caused by constantly reloading xwork.xml. I see that there is a comment in the class mentioned above, on line 127:
@todo it currently appears that the reload strategy is to check on each call to getConfiguration(). this seems extremely burdensome. a caching mechanism should be implemented
Is it possible to have the best of both worlds, and have the xwork.xml reloaded only on redeploy?
TIA, Craig
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