NullPointer Exception when importing into burp

[maik-s]

Hello,
thanks for providing this addon.
gradle can build it successfully, but importing the .jar file fails in burp.

java.lang.NullPointerException
	at burp.BurpExtender.createNewProfile(BurpExtender.java:60)
	at burp.BurpExtender.setupTab(BurpExtender.java:96)
	at burp.BurpExtender.registerExtenderCallbacks(BurpExtender.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at burp.is.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:748)

The reason is that the UI-Components like the following in BurpExtender.java

    private JPanel panel;  
    private JTextField accessKey;  
    private JTextField secretKey;  
    private JTextField region;  
    private JTextField service;  
    private JComboBox profileComboBox;

are not generated by the gradle building process correctly.
My guess is because you used the IntelliJ UI Designer.

According to this https://stackoverflow.com/a/38423072/2835625 answer this problem can be resolved very easily.

[egru]

I can build and import the jar file into Burp just fine. I'm building the jar file as an artifact in IntelliJ and it's been working for me. Are you building it with gradle from the command line?

[maik-s]

Yes i am building it with gradle from the command line.

[maik-s]

As far as i understood, IntelliJ defines the UI components in /src/main/java/burp/TabPanel.form and uses this file during the building process.
But gradle cannot interpret this file, hence, the components are uninitialized in BurpExtender.java

From my understanding, all you need to do is to configure IntelliJ (like shown in the stackoverflow comment) to write down the UI component definition into the java source code. By this, gradle will able to build the extension properly, after including

dependencies {
    compile 'com.intellij:forms_rt:7.0.3'
}

in the gradle.build file

[egru]

It should be building correctly now. I had to add that dependency in conjunction with converting the form files to java source instead of them being binaries.

[maik-s]

Now a new error occurs, after importing it into burp

java.lang.ClassNotFoundException: com.intellij.uiDesigner.core.Spacer
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at burp.mhg.a(Unknown Source)
	at burp.mhg.<init>(Unknown Source)
	at burp.spf.a(Unknown Source)
	at burp.gih.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:748)