GWT 2.5 Java 5 runtime(!) compatibility

Hi all,

while trying to upgrade to GWT 2.5 I noticed that all jars (incl. gwt-servlet.jar) are now build with target 1.6 (class file version 50.0).

This removes ability to host a GWT application on older application servers (e.g. Websphere 6.1).
While I understand that at least at build time during GWT-compile Java 6 is a requirement, I don't understand this restriction on the runtime environment.

Can somebody from the team please shed some light if this is intentional (if so why?) or just an oversight, which would be fixed in subsequent releases?

Thanks,
Lars

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