Types not resolved when upgrading to GWT 2.7.0 ?

I am trying to upgrade to GWT 2.7.0 (from 2.6.1), and keeping getting these strange errors, below are a few of them.

I compile with java 8, but did put the target and source on java 1.7.

I tried several thinks, but can't get it resolved 

Any idea what this could be ?

[INFO]          [ERROR] Errors in 'jar:file:/1.2-SNAPSHOT/ited-gwt-client-1.2-SNAPSHOT-sources.jar!/com/EffectActionInsertOrAdd.java'
[INFO]             [ERROR] com.EffectAction cannot be resolved to a type

[INFO]          [ERROR] Errors in 'jar:file:/Maven/repository/com/google/gwt/gwt-user/2.7.0/gwt-user-2.7.0.jar!/com/google/gwt/emul/java/lang/Long.java'
[INFO]             [ERROR] Line 181: The method forDigit(int, int) in the type Character is not applicable for the arguments (int)
[INFO]             [ERROR] Line 184: The method forDigit(int, int) in the type Character is not applicable for the arguments (int)
[INFO]             [ERROR] Line 191: The method forDigit(int, int) in the type Character is not applicable for the arguments (int)
[INFO]             [ERROR] Line 188: The method forDigit(int, int) in the type Character is not applicable for the arguments (int)
[INFO]             [ERROR] Line 228: The method forDigit(int, int) in the type Character is not applicable for the arguments (int)

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