I don't know if this is intentional, but gwt-log is no longer (gwt-log 3.3.2) compile-time compatible with java 6. RC versions of gwt 2.6 had this issue which they resolved because gwt is still 6 compatible.
Here's the compile exception:
[INFO] Loading inherited module 'com.allen_sauer.gwt.log.gwt-log-TRACE'
[INFO] Loading inherited module 'com.allen_sauer.gwt.log.gwt-log-impl'
[INFO] [ERROR] Unexpected error while processing XML
[INFO] java.lang.UnsupportedClassVersionError: com/allen_sauer/gwt/log/rebind/LogMessageFormatterGenerator : Unsupported major.minor version 51.0
Here's a look at the compiled file:
$ file LogMessageFormatterGenerator.class
LogMessageFormatterGenerator.class: compiled Java class data, version 51.0
It sounds like it wouldn't be a big deal to just compile for java 6 under java 7, but if you're in an environment that has a build server which is still on 6, it becomes more problematic.
Thanks,
Mike