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Burp Fails to add Jython.jar

Denis | Last updated: 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/java.net.URLClassLoader.findClass(URLClassLoader.java:471) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:398) at burp.yy.a(Unknown Source) at burp.yy.<init>(Unknown Source) at burp.df7.a(Unknown Source) at burp.nv.lambda$panelLoaded$0(Unknown Source) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) 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

PortSwigger Agent | Last updated: Jun 25, 2019 09:49AM UTC

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

Burp User | Last updated: Jun 26, 2019 10:04AM UTC

It helps, thanks. My bad.

akash-hamal | Last updated: Apr 09, 2021 04:56AM UTC

hi team, i am getting same error while loading extensions even after i have loaded jython standalone jar in python environment I am using version 2021.3.1 of burp professional version and i am on macbook air Can you help me figure out whats wrong

akash-hamal | Last updated: Apr 09, 2021 05:11AM UTC

hi sorry for inconvenience i figured out, i just restarted burp and loaded those extensions and it worked :)

Liam, PortSwigger Agent | Last updated: Apr 09, 2021 05:49AM UTC

Thanks for letting us know.

asti | Last updated: Feb 14, 2022 10:49AM UTC

i have set java environment but still getting same error i am trying to install oauthscan extender-add-upload jar file-next

Liam, PortSwigger Agent | Last updated: Feb 14, 2022 10:50AM UTC

Could you share the error message with us?

asti | Last updated: Feb 14, 2022 11:13AM UTC

java.lang.ClassNotFoundException: burp.BurpExtender at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:433) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:466) at burp.cym.a(Unknown Source) at burp.cym.<init>(Unknown Source) at burp.ciz.a(Unknown Source) at burp.bee.lambda$panelLoaded$0(Unknown Source) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at java.base/java.lang.Thread.run(Thread.java:831)

asti | Last updated: Feb 14, 2022 11:23AM UTC

sir what is the issue

Liam, PortSwigger Agent | Last updated: Feb 14, 2022 02:05PM UTC

Which extension are you trying to load?

Could you provide us with a screenshot of your Extender > Options tab?

Additionally, could you send us your diagnostics information? You can find this by going to "Help > Diagnostics" within Burp.

You can email us via support@portswigger.net. Thanks!

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