What does the jsr keyword mean?

Question

I\'m looking at some Java code, and I\'ve noticed the following:

if (!foo(bar, baz, qux)) {
    i = 0; jsr 433;
}

javac chokes on it, sayin

Answer 1

JSR (which stands for Jump Subroutine) is part of the Java Virtual Machine Specification. It's a instruction set for the JVM.

Brief description

The address of the opcode of the instruction immediately following this jsr instruction is pushed onto the operand stack as a value of type returnAddress.

This can be found on the JVM book 2nd edition.