Error Handling In Spring Webflow
to make a flow routing decision. Finally, several examples of invoking actions from the various points possible within a flow will be discussed. 6.2.Defining action states Use the action-state element when you wish to invoke an action, then transition to another state based on the action's outcome:
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October 27, 2005 One of the most important features coming in Spring Web Flow (SWF) 1.0 is the new state exception handling abstraction. This abstraction serves one purpose: to allow you to program what the flow should do when something goes wrong. Prior to 1.0 RC1 (due out November 7th), previous SWF releases simply did not address this problem at all. Instead, they relied on the calling front controller (like Struts or Spring MVC) to care for exceptions generated by executing flows. For example, with Spring MVC, this meant an Exception thrown in an executing flow state would trickle up the stack and be caught by a HandlerExceptionResolver, which would then select an error view to display. That behavior was "good enough" for PR5, but not for 1.0. A Flow is a very powerful controller, and absolutely must be able to handle exceptions natively for us to consider the system feature complete. So with that said, we are very happy with the new exception handling system, and this blog is here to tell you about it, as well as get some feedback on the approach. Here's the scoop: Any Flow definition may now be configured with an ordered set of one or more StateExceptionHandler objects. Here's the handler interface: /** * A strategy for handling an exception that occurs in a state of an executing flow definition. * * @author Keith Donald * @author Erwin Vervaet */ public interface StateExceptionHandler { /** * Can this handler handle the given state exception? Implementations * typically traverse the exception's "root cause" graph to match on * nested exceptions. * @param e the exception that occured * @return true if yes, false if no */ public boolean handles(StateException e); /** * Handle this exception in the state context of the current request. * Optionally select an error view that should be displayed. * @param e the exception that occured * @param context the current state context * @return the selected error view that should be displayed (may be null if * the handler chooses not to select a view) */ public ViewDescriptor handle(StateException e, StateContext context); } Once your exception handlers are configured, when a StateException is thrown within a State at runtime (for example, as the result of an ActionState calling an Action that calls one of your POJO methods that throws a checked business exception), that exception is passed to the errant Flow for handling. The Flow then iterates over its handler set until it finds a suita