If you are importing SoapUI into Java, I have a decent guide that will help get your started
here. As for a Datasource, I just use a SQLite database and grab the information VIA Java for the UI portions of my script. I then take a property file and store it for the SoapUI portions of the program. Works very well and makes it easier to distribute and know exactly what happened where.
If I am wrong by my assumption regarding importing SoapUI into Java, DataSources and DataSinks are technically for pro versions only. Again, you can easily just have it read a SQLite database using a groovy script.
