[logback-user] ThrowableProxy and instanceof in EventEvaluator

[Hontvári József]

In an event evaluator called in an option of an "ex" formatting 
specifier I would use a "throwable instanceof example" expression.
This is the same as in Example 5.3 in the documentation, which also uses 
instanceof.

This doesn't work because the throwable object is not a Throwable but a 
ThrowableProxy.

Again, at another place, in the table at the beginning of the "Evaluator 
Filters taking Java Expressions" section in chapter Filters it is shown 
that the type of throwable is Throwable (annd not ThrowableProxy).

Somehow I still get a ThrowableProxy instead of Throwable.