SOAP UI Code generator with Basic Auth

Hello, I managed to send a SOAP message with SOAP UI signing the message with Auth Basic authentication adding a signature with this settings:

I wanted to do this in a java code, so I generated with SOAP UI code generator using Axis 2 artifacts option. I generated the object and sent the request but obviously the signature is needed, but I don't know how to apply that, any suggestion to approach this?

Thanks.