Are there any guarantees in JLS about order of execution static initialization blocks?

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Yes, static initializer blocks are guaranteed to execute in textual order.

From the JLS, section 12.4.1:

The intent is that a class or interface type has a set of initializers that put it in a consistent state, and that this state is the first state that is observed by other classes. The static initializers and class variable initializers are executed in textual order, and may not refer to class variables declared in the class whose declarations appear textually after the use, even though these class variables are in scope (ยง8.3.3). This restriction is designed to detect, at compile time, most circular or otherwise malformed initializations.

And from 12.4.2:

Next, execute either the class variable initializers and static initializers of the class, or the field initializers of the interface, in textual order, as though they were a single block.

Personally though, I’d put all the variable declarations at the start, and then a single static initializer block. I consider that to be a lot easier to follow.

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