Trouble loading XSD-compliant DOM-parser when using testRunner.sh vs. UI

May be this is not the right forum for the above issue as that is something out of toppic to SoapUI and something related to your implementation.

Have you tried anything on net?

May be see if below link is helpful?
https://stackoverflow.com/questions/22528848/java-lang-illegalargumentexception-no-schemafactory-that-implements-the-schema