I am getting the following error when running my Play Framework 2.2.x (Java) project:

```
Configuration error
Cannot register class [models.SomeClass] in Ebean server

```

The error messages displayed in the browser points me to the line `ebean.default="models.*"` in my `application.conf`, and the console tells me that I have a `java.lang.VerifyError: Bad type on operand stack` in one of my methods. There is nothing special about the methods for which this happens, and it has happened for a handfull of methods now.

I have found out that the error can be avoided by using a static method instead: that is by replacing `someObject.doJob()`by `SomeClass.doJob(someObject)`. I have used this hack, and it works, but I am not very happy about making all my methods static when they should not be.

Has anyone encountered the same problem and found a way to fix it (without making the methods static)?