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Exceptions are important in Java, here's how to throw them: 
$class = $turpenv->findClass('java/lang/Exception');
$constructor = $class->findConstructor('(Ljava/lang/String;)V');
$instance = $class->create($constructor, 'Test');
$turpenv->throw($instance);
...
$turpenv->throwNew('java/lang/IllegalArgumentException', 'Test');
We can also check whether an Exception occured: 
if ($exc = $turpenv->exceptionOccurred()) {
...
}
and we can catch them: 
$turpenv->throwNew('java/lang/IllegalArgumentException', 'Test');
if ($exc = $turpenv->exceptionOccurred()) {
  printf("Msg: %s\n", $exc->toString('()Ljava/lang/String;'));
  $turpenv->exceptionClear();
}
see: ExceptionSample.java

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