In Java a class can have multiple static {} blocks, which is useful (among other occasions) when you have multiple fields you want to initialize: it lets you write

class Foo {
  static Map<Object, String> names = new HashMap<>();
  static {
    // initialize names
  }

  static Map<Object, Integer> ids = new HashMap<>();
  static {
    // initialize ids
  }
}

What's the motivation to disallow this?