Solution for java.lang.ClassNotFoundException when loading your Burp Suite extention

When building your own Burp Suite extension, it can occur that compiling your code and creating the jar works find, but that you get the exception java.lang.ClassNotFoundException when loading your extention in Burp Suite. This article shows the solution to your problem.

The reason is suite simple: Burp Suite expects to find your implementation in a Java package called "burp". Having the line package burp; in your source files is not enough! You also have to take this into account when creating your jar file.


Creating and building Burp Suite extention using Java command-line tools

Burp Suite allows you to easily write your own plugins, to perform complex and highly customized tasks within Burp. PortSwigger (the developer behind Burp Suite) created a series of blog posts wherein he explains what can be done with Burp Extensions. In his first blog post about the subject (see Writing your first Burp Suite extension) PortSwigger explains how you can build your own extension using an IDE. Some of us prefer however to not use a heavy IDE, but to compile the jar from the command-line. This article show how to use the javac and the jar command to create your Burp extension from the command-line.


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