The Java® Language Specification, Java SE 7 Edition, Fourth Edition
by James Gosling, Bill Joy, Guy Steele, Gilad Bracha, Alex Buckley
8.7. Static Initializers
A static initializer declared in a class is executed when the class is initialized (§12.4.2). Together with any field initializers for class variables (§8.3.2), static initializers may be used to initialize the class variables of the class.
StaticInitializer: static Block
It is a compile-time error if a static initializer cannot complete normally (§14.21).
It is a compile-time error if a return statement (§14.17) appears anywhere within a static initializer.
It is a compile-time error if the keyword this (§15.8.3) or the keyword super (§15.11, §15.12) or any type variable declared outside the static initializer, appears anywhere within a static initializer.
Use of class variables whose declarations appear textually ...
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