An interface to be implemented if require to get informed when WebWork
starts up, It's being hooked up through
FilterDispatcher#init(javax.servlet.FilterConfig)
->
DispatcherUtils#init(javax.servlet.ServletContext) methods calls.
It can be configured through webwork.properties
that
resides in the classpath, typically in /WEB-INF/classes
directory
through the following entry
webwork.dispatcher.startUpListener=foo.bar.StartupListener1, foo.bar.StartupListener2
The value of the properties is the FQN (Fully Quantified class name of the start up listeners)
It must implements this interface, else a ClassCastException will be registered in the log.
Multiple class names could be specified, but they must be comma separated.