如何渴望在Hibernate Native SQL查询中获取联接表集合？

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

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();

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)