How to create a property without accessors in Kotlin?

I am using a Kotlin class from Java code. My Kotlin class looks like:

class Something {
    var a = 0
}

I want to be able to access a from Java code like

s = new Something();
s.a = 5;

however, I only have s.getA() and s.setA(5). Is there any way to make this property directly settable and gettable from Java? Obviously we can't have custom getter and setter in this case.