ThrowableProxy passed into EventEvaluator
-----------------------------------------

                 Key: LBCLASSIC-155
                 URL: http://jira.qos.ch/browse/LBCLASSIC-155
             Project: logback-classic
          Issue Type: Bug
          Components: Other
    Affects Versions: 0.917
            Reporter: Hontvári József
            Assignee: Logback dev list


In an event evaluator which is called in the option part of an "ex" formatting 
specifier I cannot use a "throwable instanceof example" expression, because the 
evaluator receives a ThrowableProxy and not a Throwable.

Here is a stack trace, dumped from the evaluator expression. It does include a 
ThrowableProxyConverter.convert call:

java.lang.Exception: Stack trace                                                
                                  
       at java.lang.Thread.dumpStack(Thread.java:1206)                          
                                 
       at mireka.E.f(E.java:21)                                                 
                                 
       at SC.eval0(SC.java:3)                                                   
                                 
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)           
                                        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)   
                       
       at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
                  
       at java.lang.reflect.Method.invoke(Method.java:597)                      
                                 
       at org.codehaus.janino.ScriptEvaluator.evaluate(ScriptEvaluator.java)    
                                 
       at org.codehaus.janino.ScriptEvaluator.evaluate(ScriptEvaluator.java)    
                                 
       at ch.qos.logback.core.boolex.JaninoEventEvaluatorBase.evaluat 
(JaninoEventEvaluatorBase.java:53)         
       at 
ch.qos.logback.classic.pattern.ThrowableProxyConverter.convert(ThrowableProxyConverter.java:109)
       
       at 
ch.qos.logback.classic.pattern.ThrowableProxyConverter.convert(ThrowableProxyConverter.java:31)
        
       at 
ch.qos.logback.core.pattern.FormattingConverter.write(FormattingConverter.java:32)
                     
       at 
ch.qos.logback.core.pattern.PatternLayoutBase.writeLoopOnConverters(PatternLayoutBase.java:110)
        
       at ch.qos.logback.classic.PatternLayout.doLayout(PatternLayout.java:132) 
                                 
       at ch.qos.logback.classic.PatternLayout.doLayout(PatternLayout.java:51)  
                                 
       at ch.qos.logback.core.WriterAppender.subAppend(WriterAppender.java:267) 
                                 
       at ch.qos.logback.core.WriterAppender.append(WriterAppender.java:117)    
                                 
       at 
ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:89)
            
       at 
ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60)
   
       at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:271)  
                                 
       at ch.qos.logback.classic.Logger.callAppenders(Logger.java:258)          
                                 
       at 
ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:440)       
                       
       at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:394) 
                                 
       at ch.qos.logback.classic.Logger.debug(Logger.java:517)                  
                                 
       at org.subethamail.smtp.server.Session.run(Session.java:119)             
                           

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