See CODETOOLS-7901527 for background and more details.

The use of "@library /../../test/lib" causes the directory "test/lib" to be created in the current directory. Also, any .java file located in /../../test/lib that is explicitly compiled with @build will also end up in this directory (implicitly compiled files do not).

The ../ notation in jtreg tests is generally discouraged, and support in jtreg has been added to make it so it is no longer necessary. Adding the following to TEST.ROOT:

    external.lib.roots = ../../

Makes it so now you can just use:

    * @library /test/lib

This bug is only meant to address the issue of files/directories being created outside the JTwork directory. It will not address all uses of ../, which are not problematic if they don't take you above the root of the test directory.