Handling Exceptions

Use

This section provides information on the following

What happens if an exception is thrown while evaluating conditions?
What happens if the exception is thrown while firing an action?
Are checked/ unchecked exceptions handled differently?

Procedure

Exceptions While Evaluating Conditions

Exceptions thrown while evaluating conditions in a rule are considered FATAL and are broadcasted to the calling application code, wrapped in a RuleException. The RuleException Object can be obtained using the following code:

                try{ //    engine.invokeRuleset...        
}catch(RuleException ruleException){    
Exception rootException=ruleException().getRootException(); //  Process Root Exception....

Exceptions While Executing Actions

Exceptions thrown when executing actions of a rule are considered NON-FATAL. The stack trace of these exceptions is printed and the Engine continues to fire the actions of other satisfied rules.

Example

If an exception occurs while performing action B (in Rule1), then a message exception firing Rule1 will be printed on console along with stack trace. The Engine will continue to perform actions D & E of Rule2. Action C of Rule1 will however NOT be performed.

Rule1	3 actions, say A, B, C
	Priority High
Rule2	2 actions say D, E
	Priority Medium

Handling Checked/ Unchecked Exceptions

Checked and unchecked exceptions are handled in the same way. Engine makes no differentiation between these two.