It would be convenient for a family of tests to use externally provided jar files.

One such possibility would be to allow such jar files to be bundled with jtreg, in the jtreg/lib directory, and to extend the meaning of
   @library foo.jar
to be able to refer to such libraries, such that they will be included on the compile and runtime classpath.

Currently, @library foo.jar can be used to refer to a library that has been checked in to the test source directory.

Option 1: if foo.jar is not found in the directory of the defining file, check in the lib directory

Option 2: use some other syntax to indicate the jar file is to be found in the lib directory

Option 3: look up the location of the file in TEST.ROOT