JRuby 1.5.1 is now available.

JRuby 1.5.1 is a minor follow-up release that addresses some bugs in 1.5.0. Issues include JRuby 1.5's failure to pick up JDBC drivers from CLASSPATH, and a memory leak when extending Java class with additional Ruby instance variable.

The JRuby team recommend that all JRuby users upgrade to 1.5.1.