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Extending Jython

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To raise a Jython exception requires throwing the PyException class with two arguments: the actual Jython exception, and the exception message (what is referred to as the exception argument). Jython's built-in exceptions are located in the org.python.core.Py class. So, a ValueError is really a Py.ValueError.

raise ValueError, "Invalid Value"

The preceding Jython statement translates to its Java form as follows:

throw PyException(Py.ValueError, "Invalid Value")

Listing 1 uses the PyException to raise a Jython ValueError exception.

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