SpringSource/spring-integration — pull request #522 by garyrussell (2012-06-26 16:14:50+00:00)
Title: INT-2630 MessageHeaders/History Conversion Issue

Spring-expression 3.1 unconditionally converts all arguments for
method calls; MessageHeaders and MessageHistory do not have
no-arg constructors and the MapToMapConverter always attempts
conversion, in case any elements require conversion.

We are exploring a Spring 3.1 change but, in the meantime, we
have a detour in BeanFactoryTypeConverter in that we
can skip conversion of these types.