Thread safety of static blocks in Java

Question

Let\'s say I have some Java code:

public class SomeClass {
    static {
        private final double PI = 3.14;
        private final double SOME_CONSTANT =          


        

Answer 1

If the first thread hasn't finished initializing SomeClass, the second thread will block.

This is detailed in the Java Language Specification in section 12.4.2.