NullPointerException using maven-plugin with MTOM attachment

Hi!

Could you try downgrading to SoapUI 4.5.2 by changing

       
<groupId>com.smartbear.soapui</groupId>
<artifactId>soapui-maven-plugin</artifactId>
<version>4.6.1</version>

to

       
<groupId>eviware</groupId>
<artifactId>maven-soapui-plugin</artifactId>
<version>4.5.1</version>

Also, there's no TestCase in your project file, is this the correct version of the project file?
Could you try to run the project using the command line runner, and see if you get the same error there?

--
Regards

Erik
SmartBear Sweden