Java technologies are usually integrated in a web page in the form of a Java applets:
Test Studio does not support testing of Java-based technologies. With applets we can only detect that they're there (screenshot 1) but not actually perform any verification. If you're app has a Java applet-based popup maybe it's possible to record a WaitForElementsExists on it - the way to pause the test while the “processing please wait”
message is there is to simply wait it out. You record a WaitForElementExists (screenshot 2) which will resume execution only when the element is no longer there and we are thus ready to continue executing.
the Telerik team