Exception events are generated by FM-Classic whenever an unusual
event occurs when a template is processed. For instance, if a
TemplateModelException is thrown by a
an exception event will be propagated up to the current
FM-Classic exception events are encapsulated in the
TemplateExceptionEvent class. Objects of this class provide
information about the exception that occurred, whereabouts in the code the
exception occurred, and the severity of the exception. For convenience,
TemplateExceptionEvents also contain the current
Writer, so that exception messages can be sent directly
to the template output stream.
TemplateExceptionListeners are notified of
TemplateExceptionEvents whenever they are generated by FM-Classic
at processing time.
TemplateExceptionListeners are registered
TemplateEventAdapter to indicate that they should receive
FM-Classic comes with two implementations of
which performs the standard output of FM-Classic exceptions into the template
output stream, in the form of an HTML comment, and
Log4jExceptionListener, which adapts FM-Classic exception events
logging messages. See the JavaDoc
for more details of these implementations.
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