Pojo used by many other objects

Question

Hello all,
In my application I have got a complex entity containing lists and maps filled with data by the persistence tier and that entity is to be used by many other objects in my application, including many controllers. I am trying to find a way to access that pojo in the most practical way. For that I could use a kind of factory such as:
public final class MyPojoFactory
    private static MyPojo instance;
    public static MyPojo getInstance(){
    if(instance == null){
       instance = new MyPojo();
       return instance;
}and then access my pojo using the MyPojoSingleton.getInstance() method throughout the client part of my application. However, I am bit concerned about the thread safety of this implementation since instance is a static variable and that its state could be altered indeterministically.
What I've thought of is having a parent abstract class extended by all the classes that would need this pojo. But sometimes these classes hierarchy gets really deep and I end up with things like myClass.getParentClass().getParentClass().getMyPojo() if you see what I mean, which I would like to avoid.
Any solution or design pattern or simpler implementation I should have a look into?
Thanks a bunch,
Jimmy

Answer 1

Well thanks for this tip! But I've got another similar case where the service needs an id as parameter as such:
public final class MyPojoFactory
    private static MyPojo instance;
    public static MyPojo getInstance(long primaryKey){
    if(instance == null){
       instance = service.getData(primaryKey);
       return instance;
}In that case I don't think I could use my PojoFactory because the instance object has a global scope, doesn't it? How could I handle such a case?
Thanks again,
Jimmy