Woonsan Ko created SCXML-181:
--------------------------------
Summary: Provide SCXML source location info when logging warnings
or errors
Key: SCXML-181
URL: https://issues.apache.org/jira/browse/SCXML-181
Project: Commons SCXML
Issue Type: Improvement
Reporter: Woonsan Ko
Currently, SCXML model objects do not have source location information for
debugging purpose.
For this reason, if there's any error (e.g, JEXL script error), then we get the
following log:
EXPRESSION_ERROR (evalScript('
unknownObject.invoke();
'):org.apache.commons.scxml2.env.jexl.JexlEvaluator.evalScript@161![14,22]:
'unknownObject.invoke();' attempting to call method on null): Expression error
inside /hello/world
The reason is that SCXML JexlEvaluator doesn't give a source location
information to the JexlEngine for itself and so JEXL engine just tries to make
a debugging information by itself (by finding the caller class (JexlEvaluator
in this case) and its line number (161) as well as more debugging purpose
parsed JEXL node information ([14,22])).
In order to give a precise source location information of SCXML, we have to
provide that kind of information in commons-scxml when invoking JEXL Engine.
For example, JexlEvaluator#evalScript() invokes
getJexlEngine().createScript(script) currently.
If we want to give source location info, then we'd better change it to
getJexlEngine().createScript(script, JexlInfo, null), where JexlInfo contains
the debugging information.
However, the current SCXML model objects do not have source location
information at all unfortunately.
It can be a good improvement to add that kind of information in SCXML model
objects in the future.
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