compiler errors after upgrade to gwt 2.8.0

Hello,

after upgrading a project from GWT 2.7.0 to GWT 2.8.0 I and when compiling with the GWT compiler using the -strict option, I get a lot of errors like this:

   Tracing compile failure path for type 'java.util.stream.Stream'

      [ERROR] Errors in 'jar:file:/home/magnus/dvl/lib/gwt-2.8.0/gwt-user.jar!/com/google/gwt/emul/java/util/stream/Stream.java'

         [ERROR] Line 1113: The method naturalOrder() is undefined for the type Comparator

         [ERROR] Line 101: The method spliterator() is undefined for the type List<Stream<? extends T>>

         [ERROR] Line 1098: The method naturalOrder() is undefined for the type Comparator

         [ERROR] Line 1122: The method spliterator() is undefined for the type List<T>

         [ERROR] Line 181: The method stream() is undefined for the type Set<T>

         [ERROR] Line 85: The method stream(Object[]) is undefined for the type Arrays

         [ERROR] Line 185: The method stream(T[]) is undefined for the type Arrays

When switching back to GWT 2.7.0, the errors don't appear.

Unfortunately, the messages do not point in my code. So how do I have to modify my project in order to solve the problem?

Thanks
Magnus

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