Example

public class BeanClass implements javax.ejb.SessionBean {
public Collection ejbFindByPrimaryKey (String key) throws FinderException{
PrimaryKey pKey = new PrimaryKey(key);
Collection result;
searchByPrimaryKey(pKey);
if (pKey.exists())
result = pKey;
return result;
else
throw new ObjectNotFoundException("Primary Key "+ key + " not found");
}
//methods that must implement the interface
}

Solution
The ejbFindByPrimaryKey() should return the primary key. Other finder methods should return a collection of keys.


public class BeanClass implements javax.ejb.SessionBean {
public String ejbFindByPrimaryKey (String key) throws FinderException{
PrimaryKey pKey = new PrimaryKey(key);
searchByPrimaryKey(pKey);
if (pKey.exists())
return key;
else
throw new ObjectNotFoundException("Primary Key "+ key + " not found");
}
//methods that must implement the interface
}