jdk/test/java/io/Reader/ReaderBulkReadContract.java is leaving files with names like ReaderContract100190835541748790 in /cygdrive/c/temp

The file is created here:
cat -n jdk/test/java/io/Reader/ReaderBulkReadContract.java
   [...]
   151 File file = File.createTempFile("ReaderContract", "");

but the code does not call file.deleteOnExit() or take other steps to remove the file when finished.