jstat -compiler failed with FailedType=2:

Compiled Failed Invalid Time FailedType FailedMethod
[ ... ]
2063 1 0 85.52 2 DBObject mapSelectResult

The docs explain "FailedType":

http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html#compiler_option
http://java.sun.com/javase/6/docs/technotes/tools/share/jstat.html#compiler_option
------------------------------------------------------------
-compiler Option
                   HotSpot Just-In-Time Compiler Statistics
[ ... ]
FailedType Compile type of the last failed compilation.
------------------------------------------------------------

It is nowhere explained, what value "2" means.

Obviously, possible values are "0", "1" and "2".
It needs to be documented somewhere, what these values mean.