Frequently Asked Questions
Questions
1. I get antlr-related errors when I try to build SMDL Eclipse. What gives?
SMDL has been tested with Eclipse 4.1 with the ANTLR plugin installed. However, the ANTLR plugin doesn't always work. Try right-clicking on the project name in the project explorer window and selecting the menu item "Toggle Antlr Nature".
2. The SMDL generated code that doubly defines a constant for an event. Is this a bug?
It is a limitation. You cannot have two different event handlers that only differ by case.
For example:
receive200response
receive200Response
represents two different event handlers; the code generator will generate constants for both of these events but will convert the constants to all upper-case values. So the two identifiers will be the same and result in a clash.
In practice, this is almost always a typo.
3. Why does SMDL fail with the complaint NoClassDefinition: antlr/TokenStream when I run the SMDL Tool?
You must have the antlr.jar in the same directory as the smdl.jar.
4. If an event fires but returns the state machine to the same state, will the state machine invoke the enter action if one is defined?
No. The state machine never exits the state and thus cannot re-enter it.
