Error importing jar in groovy script (soapui)

Putting the jar under soapui-pro-2.5\bin\ext is all you need for the classes to be found (although restarting SoapUI won't hurt).

However - you should check that the error you get is related to your jar. Is com.my.research available within myjar.jar? If no - just add it.

If yes, add more detailed information to your post.