In WebLogic 10.3.0, I tried adding
<fast-swap>
<enabled>true</enabled>
</fast-swap>
to my weblogic.xml configuration file. (<fast-swap>true</fast-swap>, as specified in the instructions here, throws an XML error, instead. Most examples that I've found cite the method I've posted above as the One True Way. )
Unfortunately, the weblogic.servlet.internal.WebAppModule.loadFastSwapClassloader throws an error - "java.lang.AssertionError: BEA_HOME environment variable is null"
The BEA_HOME environment variable is set! I can't imagine what might be going wrong. Google doesn't even know!