Annotations strange behavior

darkknight80 · **Joined:** Sat Mar 14, 2009 8:59 am **Posts:** 1

I have code similar to what is below. During runtime, when I do getVersions() it is returning it with the keys of the Map as Integer instead of a String. I can compile, but at Runtime get ClassCastException because I'm expecting a String value instead of Integer.

The only thing I can think of is there is a problem and something strange going on with @MapKey. The id is an Integer primary key of the Version class and that is how I want it related in the database. Using tools to read the annotations and create tables. But in my Java Map I want the key to be another String value of a field in the Version Class.

Code:

@Entity
public class Software {
    @OneToMany(mappedBy="software")
    @MapKey(name="id") 
    public Map<String, Version> getVersions() {
        return versions;
    } 
}
 

littypreethkr · **Posted:** Sat Mar 14, 2009 12:28 pm

If you want some String field to be the key of the map then specify the name of that field inside the @MapKey instead of "id"