How to invoke join table assembly in Hibernate Native SQL Query?

I have three database tables

• Customer
• Product
• CustomerProductRelation

According to these tables, I have two Hibernate POJO

• Product
• Customer

One of the member variables is joinTable:

@JoinTable(name = "CustomerProductRelation", joinColumns = { @JoinColumn(name = "CUSTOMER_ID") }, inverseJoinColumns = { @JoinColumn(name = "PRODUCT_ID") })
private List<Product> products;

For some reason, I need to use my own SQL query in the Customer table, in this case, how do I want to receive products in my customer list?

I am doing something similar to this:

String queryString = "select c.*,cpr.product_id from Customer c, CustomerProductRelation cpr where c.customer_id = cpr.customer_id";
List list = getSession().createSQLQuery(queryString)
                .addEntity("c", Customer.class)
                .addJoin("p", "c.products").list();

This does not work. An exception is the following:

java.lang.NullPointerException at org.hibernate.loader.DefaultEntityAliases.<init>(DefaultEntityAliases.java:37) at org.hibernate.loader.ColumnEntityAliases.<init>(ColumnEntityAliases.java:16) at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.generateCustomReturns(SQ‌​LQueryReturnProcessor.java:264)

Please let me know if anyone knows about this solution.