[BUG] Extension not loading on Burp 2.1.07

[ghost]

I can't start client extension on Burp Suite Professional 2.1.07

java.lang.RuntimeException: java.lang.NoClassDefFoundError: teamextension/ServerListCustomCellRenderer at burp.bvn.a(Unknown Source) at burp.ez1.addSuiteTab(Unknown Source) at burp.apo.addSuiteTab(Unknown Source) at burp.bho.addSuiteTab(Unknown Source) at burp.BurpExtender.registerExtenderCallbacks(BurpExtender.java:31) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:567) at burp.elf.lambda$registerExtenderCallbacks$0(Unknown Source) at java.base/java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:835) java.lang.RuntimeException: java.lang.NoClassDefFoundError: teamextension/ServerListCustomCellRenderer at burp.bvn.a(Unknown Source) at burp.ez1.addSuiteTab(Unknown Source) at burp.apo.addSuiteTab(Unknown Source) at burp.bho.addSuiteTab(Unknown Source) at burp.BurpExtender.registerExtenderCallbacks(BurpExtender.java:31) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:567) at burp.elf.lambda$registerExtenderCallbacks$0(Unknown Source) at java.base/java.util.concurrent.Executors$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:835)

• OS: macOS 10.15.2
• Burp Version: 2.1.07

[Static-Flow]

Are you building it yourself or using the jar located at "/BurpSuite-Team-Extension/target/BurpSuiteCollaborationClient.jar". I just pulled it down and loaded the jar which worked for me. I am on macOS 10.14.7 and the same Burp. I was also able to compile it using this version of Java:

openjdk version "12.0.1" 2019-04-16 OpenJDK Runtime Environment (build 12.0.1+12) OpenJDK 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

[ghost]

when I load the one in repository "/target/BurpSuiteCollaborationClient.jar" I get this error instead:

java.lang.ClassNotFoundException: burp.BurpExtender at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:436) 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:415) at burp.elf.a(Unknown Source) at burp.elf.<init>(Unknown Source) at burp.c7u.a(Unknown Source) at burp.fuj.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:835)

I was compiling it with maven but I have Java / JDK 13.0.1 installed with brew:

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f) Maven home: /usr/local/Cellar/maven/3.6.3/libexec Java version: 13.0.1, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk-13.0.1.jdk/Contents/Home Default locale: en_US, platform encoding: UTF-8 OS name: "mac os x", version: "10.15.2", arch: "x86_64", family: "mac"

Should I switch to Java / JDK 12 with brew install or the fact that burp uses a bundled version of java 12 is enough?

[Static-Flow]

It's odd that both the errors have to do with not finding classes which suggests a classpath issue. Maven should handle all of that for you. Java 12 vs 13 shouldn't matter but it might be worth trying to compile on 12.

_{Sent with GitHawk}

[Static-Flow]

I'll try and compile it on a fresh system to rule out any "works on my machine" issues

_{Sent with GitHawk}

[ghost]

I just downloaded the jar in repository again and now it's loading just fine 👍

Thank You

[Static-Flow]

Glad I could rubber duck debug for you 😂 lemme know if there are any other issues!

_{Sent with GitHawk}