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

It is not in the list of Java keywords. So I don't believe it has any meaning. And I doubt it's possible to compile it.