Just stumbled on that:

Note: As of GWT 1.5, GWT compiles the Java language syntax that is 
compatible with J2SE 1.5 or earlier. Versions of GWT prior to GWT 1.5 are 
limited to Java 1.4 source compatibility. For example, GWT 2.0 supports 
generics, whereas GWT 1.4 does not.

— *Source: *
http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsCompatibility.html

And the warning about support for Java 1.5 being deprecated since GWT 2.2 is 
done by checking at the current JVM: 
http://code.google.com/p/google-web-toolkit/source/detail?r=9636
This is different from what GWT accepts as input, which then *officially* 
doesn't 
support Java 6 (even though it emulates java.lang.String.isEmpty() and 
accepts @Override on interface-method's implementations, which makes it 
practically usable with (most) Java 6 source files).

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