I am afraid that HEAD-SNAPSHOT already requires Java 8 for client code compilation. At least I found this one for JDT - https://bugs.eclipse.org/bugs/show_bug.cgi?id=488273 (in short - JDT build switched to Java 8 baseline). IIUIC the client code may not be compiled with JDK7 due to this change. May be I am wrong and someone may to confirm that HEAD-SNAPSHOT is still compatible with JDK7 under some configurations. But very simple project generated in GWT Eclipse plugin failed to compile with UnsupportedClassVersionError for one of JDT classes (as expected, I think).
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