Otherwise, the compiler will complain: 
[INFO] Loading inherited module 'com.arcbees.jukitowebsite.JukitoWebsite'
[INFO]    [WARN] Setting configuration property named gin.ginjector.modules in com.arcbees.jukitowebsite.JukitoWebsite that has not been previously defined.  This may be disallowed in the future.
[INFO]    Loading inherited module 'com.gwtplatform.mvp.MvpWithEntryPoint'
[INFO]       Loading inherited module 'com.gwtplatform.mvp.Mvp'
[INFO]          [ERROR] The configuration property named gin.ginjector.modules is already defined implicitly by 'set-configuration-property' in com.arcbees.jukitowebsite.JukitoWebsite with 'is-multi-valued' set to 'false'
[INFO]          [ERROR] Line 44: Unexpected exception while processing element 'define-configuration-property'