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    <p>Just for anyone interested... I spent a bit of time testing stuff because I wanted to find out how to get a proper stack trace whether a Python Exception (BaseException in fact, which is the base class) or a java.lang.Throwable (java base class for Exception, Error, etc.) is thrown... this code illustrates how to catch all line number refs correctly. </p> <pre><code>import sys import traceback import java print "hello world" def custom_hook( type, exc, tb ): if isinstance( sys.exc_info()[ 1 ], java.lang.Throwable ): sys.stderr.write( "AS JAVA:\n" ) sys.exc_info()[ 1 ].printStackTrace() # java part else: sys.stderr.write( "NO JAVA TRACE:\n" ) sys.stderr.write( "AS PYTHON:\n" ) traceback.print_exc() # useful for custom exception handling! sys.excepthook = custom_hook def handle_exc(): # generate either a java.lang.Throwable (uncomment the next line and comment out "a = 16 / 0" # java.lang.String( None ) # OR... a python-style BaseException: a = 16 / 0 class Task( java.lang.Runnable ): def run( self ): # NB the problem with all this stuff is that the Java stack trace shows # a java.lang.Throwable occurring at the last line of this code block... # print "lots of stuff first" # print "lots 2" # handle_exc() # print "lots 3" # print "lots of stuff after" try: print "lots of stuff first" print "lots 2" handle_exc() print "lots 3" print "lots of stuff after" # NB do not catch both (Python) BaseException and java.lang.Throwable... # except ( BaseException, java.lang.Throwable ), e: # the above means that the line no. in handle_exc is not shown when a BaseException # is thrown... except java.lang.Throwable, t: tb = sys.exc_info()[ 2 ] sys.stderr.write( "java.lang.Throwable thrown at: %s\n" % tb.tb_lineno ) raise t java.awt.EventQueue.invokeAndWait( Task() ) </code></pre> <p>After this one might think of writing a decorator to precede def run( self ) and similar methods so that you don't have to write out this catch-the-Throwable try-except block each time... specifically:</p> <pre><code>def throw_trap( function ): def wrapper(*args, **kvargs): try: return function( *args, **kvargs ) except java.lang.Throwable, t: tb = sys.exc_info()[ 2 ] while( tb ): sys.stderr.write( "thrown at: %s\n" % tb.tb_lineno ) tb = tb.tb_next raise t return wrapper def handle_exc(): java.lang.String( None ) # a = 16 / 0 class Task( java.lang.Runnable ): @throw_trap def run( self ): print "lots of stuff first" print "lots 2" handle_exc() print "lots 3" print "lots of stuff after" java.awt.EventQueue.invokeAndWait( Task() ) </code></pre>
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    1. POHow to catch an exception in python and get a reference to the exception, WITHOUT knowing the type?
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