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Burp Fails to add Jython.jar

Denis Jun 25, 2019 09:01AM UTC

I downloaded and installed Jython-2.7.0 following the link provided by Burp.
I try to add this one to Burp and facing the error message:

java.lang.ClassNotFoundException: burp.BurpExtender
at java.base/
at java.base/java.lang.ClassLoader.loadClass(
at java.base/java.lang.ClassLoader.loadClass(
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(
at burp.yy.a(Unknown Source)
at burp.yy.<init>(Unknown Source)
at burp.df7.a(Unknown Source)
at burp.nv.lambda$panelLoaded$0(Unknown Source)
at java.base/java.util.concurrent.Executors$
at java.base/
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.base/java.util.concurrent.ThreadPoolExecutor$
at java.base/

My configs:
Burp - Enterprise Edition 1.0.17beta;

java version "12.0.1" 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

Win 10 - Version 1903, OS Build 18362.30

Paul Johnston Jun 25, 2019 03:54PM UTC Support Center agent

It looks like you’re trying to add Jython as an extension. Instead, please configure Jython in Extender > Options > Python Environment

Denis Jun 26, 2019 10:04AM UTC
It helps, thanks. My bad.

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