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kotlinlang

I'm wondering if I'm doing something wrong. I have a java class this is something like this
```class MyClass {
 private Integer accessLevel;

 AccessLevel getAccessLevel() {
  return AccessLevel.getEnum(accessLevel);
 }
}```
Then I have a mock like this
```every { mock.getAccessLevel() } returns AccessLevel.SomeAccessLevel```
However, when I try to do that, it says
```Can not set java.lang.Integer field accessLevel to AccessLevel```
Is there something I should know about this? If I rename the integer it will work, but I don't think that's a solution because that field has been serialized and stored so if I want to deserialize it on newer versions of my app then it will fail.