Valid Java code that is NOT valid Groovy code?

Question

Most Java code is also syntactically valid Groovy code. However, there are a few exceptions which leads me to my question:

Which constructs/features in Java are syn

Answer 1

Non-static initialization blocks:

class Foo {
  Integer x;   
  { x = 1; }
}

UPDATE: This is in fact valid Groovy code.

Answer 2

Declaring an array of a given type using [] after the variable name instead of the type works in Java but not Groovy.

byte[] buff = new byte[1024]; // Works

byte buff[] = new byte[1024]; // Not Groovy

Results in Primitive type literal: byte cannot be used as a method name