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Exceptions are handled seamlessly between Java and Prolog. This means
that exceptions can be thrown in Prolog and caught in Java and the other
way around. For example, if a predicate called from Java throws an
exception with throw/1 and the predicate itself does not catch
the exception, the Java-method which performed the query,
queryCutFail() for example, will throw an exception (of class
SPException) containing the exception term. Symmetrically, a
Java-exception thrown (and not caught) in a method called from Prolog
will cause the corresponding predicate (simple/2 in the example
above) to throw an exception consisting of the exception object (in the
internal Prolog representation of a Java object). See Handling Java Exceptions, for examples of catching Java exceptions in Prolog.