Working JPA repository skeleton in Play

gistfile1.txt

package repositories;

import play.db.jpa.GenericModel;
import play.db.jpa.Model;
import play.utils.Java;

import java.lang.reflect.ParameterizedType;

public abstract class BaseRepository<T extends Model> {
    private Class<T> modelClass;

	public BaseRepository(){
		ParameterizedType superclass = (ParameterizedType) getClass().getGenericSuperclass();
        modelClass = (Class<T>)superclass.getActualTypeArguments()[0];
	}
    public void save(T object) {
        object.save();
    }

    public T findOne(String query, Object... params) {
        try {
            GenericModel.JPAQuery result = runJPAMethod("find", query, params);
            return result.first();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private GenericModel.JPAQuery runJPAMethod(String method, String query, Object[] params) throws Exception {
        return (GenericModel.JPAQuery) Java.invokeStatic(modelClass, method, query, params);
    }
}