This test creates files in /cygdrive/c/temp with names like javac1052993135763659962.tmp,
javac1053620319729702391.tmp
and so on...

It is the only place in the test code for jdk or langtools where I find the pattern 'javac.*\.tmp':
cat -n jdk/test/tools/pack200/Utils.java
 [...]
    97 File tmpFile = File.createTempFile("javac", ".tmp");

There is a cleanup() method implemented at lines 192 ... 214 but it does not mention the .tmp extension.


Or, consider adding tmpFile.deleteOnExit() after line 97