Author jeff.allen
Recipients doublep, fwierzbicki, jeff.allen
Date 2018-03-17.20:03:33
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I explored this on 2.7.2a1 with a small adaptation of the provided, attached, and the embedded cause is still null. Reproduce like this:

PS bugs> javac -cp ".;C:\Jython\2.7.2a1\jython.jar;C:\Jython\2.7.2a1\javalib\*" .\iss1684\
PS bugs> java -cp ".;C:\Jython\2.7.2a1\jython.jar;C:\Jython\2.7.2a1\javalib\*" iss1684.Test
Traceback (most recent call last):
  File "<string>", line 2, in <module>
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
        at java.lang.reflect.Constructor.newInstance(
        at org.python.core.PyReflectedConstructor.constructProxy(
java.lang.RuntimeException: java.lang.RuntimeException: Thrown from Python code

Cause: null

So we get the cause in the stack dump, but it isn't the cause in the Java sense, which seems a reasonable expectation.
Date User Action Args
2018-03-17 20:03:33jeff.allensetmessageid: <>
2018-03-17 20:03:33jeff.allensetrecipients: + jeff.allen, fwierzbicki, doublep
2018-03-17 20:03:33jeff.allenlinkissue1684 messages
2018-03-17 20:03:33jeff.allencreate