I made a new release of Mint and DrJava with Mint yesterday: October 19, 2010 (r15952). The latest release is, as always, available from the Mint implementation page:
There were several bug fixes regarding assignment to variables declared as CodeFree, the places where SafeCode is required, treatment of type variables with bounds in escapes, and array types, which were erroneously printed as ‘[Lfoo/bar;’ or ‘[B’.
The version of DrJava with Mint is based on the current trunk (and therefore is newer than the updated stable release of DrJava that was recently made available).
(Re-posted from The Java Mint Blog.)