In Jython, how can I raise a Python Exception, not a java.lang.Exception?

Question

Python and Jython newbie here.

I am passably familiar with how to raise exceptions in normal Python.

However, in the Jython environment I find myself in (WLST), if I do:

raise Exception("hello")

...then it appears to raise a java.lang.Exception:

wls:/offline> raise Exception("hello") Traceback (innermost last): File "<console>", line 1, in ? at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) java.lang.Exception: java.lang.Exception: hello wls:/offline>

How can I raise a Python Exception in this environment? Or, at least: why is it a java.lang.Exception that is raised here?

Laird Nelson · Accepted Answer · 2016-06-25 23:58:34Z

For posterity, I can do this:

from exceptions import Exception as PythonException

Then I can do this:

raise Exception('This will be a java.lang.Exception.') raise PythonException('This will be a "native" Python exception.')

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