With methods test1() and test2(), I get a Type Mismatch Error: Cannot convert from null to int, which is correct; but why am I not getting the same in method test3()? How does Java evaluates the conditional expression differently in that case? (obviusly, a NullPointerException will rise in runtime). Is it a missing error?

public class Test {

    public int test1(int param) {
        return null;
    }

    public int test2(int param) {
        if (param > 0)
            return param;
        return null;
    }

    public int test3(int param) {
        return (param > 0 ? return param : return null);
    }

}

Thanks in advance!