What is object field initialization and constructor order in Java

I ended up the following scenario in code earlier today (which I admit is kinda weird and I have since refactored). When I ran my unit test I found that a field initialization was not set by the time that the superclass constructor has run. I realized that I do not fully understand the order of constructor / field initialization, so I am posting in the hopes that someone explain to me the order in which these occur.

class Foo extends FooBase {
    String foo = "foobar";

    @Override
    public void setup() {
        if (foo == null) {
            throw new RuntimeException("foo is null");
        }
        super.setup();
    }
}

class FooBase {
    public FooBase() {
        setup();
    }

    public void setup() {

    }
}

@Test
public void testFoo() {
    new Foo();
}

The abbreviated backtrace from JUnit is as follows, I guess I expected $Foo.<init> to set foo.

$Foo.setup
$FooBase.<init>
$Foo.<init>
.testFoo