There are several source files that contain a class named EchoHandler in the java.net test base. All these classes are in the unnamed package, and may have slightly different behavior.
Tests often have visibility to more than one of these classes, which makes it sometime difficult to figure out where is the source of the class that the test is using (some tests can compile directly or indirectly more than one of these EchoHandler).
It would be good to rename some of these classes so that the name of the class leaves no doubt about what implementation the tests are effectively using and where the source file can be located.