§1.2.1.(g) No static initializers

A static field of a role class must not have a non-constant initialization expression. Static initialization blocks are already prohibited for inner classes by Java (see JLS §8.1.2).

Note:
Static initialization generally provides a means for performing initialization code prior to instantiation, i.e., at class-loading time. Before any role can be created already two levels of initialization are performed: (1) The (outer most) enclosing team class performs static initializations when it is loaded. (2) Any enclosing team executes its constructor when it is instantiated. It should be possible to allocate any early initialization to either of these two phases instead of using static role initializers.