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javahibernatehql

Hibernate Lazy Initialization exception even using Join Fetch in HQL queries

I want to initialize a collection with lazy fetch mode and use Join Fetch in my queries but I some times(not always) face with lazy initialization exception ???

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: xxx.entity.Product.producerEntities, could not initilaize proxy - no session ...

for example this query:

"select p from Product p left join fetch p.producerEntities"

and my persistence class:

    class Product
    {
        Set<Producer> producerEntities = new HashSet<>();
        ....
        @OneToMany(fetch = FetchType.LAZY)
        @JoinColumn(name="pid")
        public Set<Producer> getProducerEntities(){
         return producerEntities;
         }
    ....

}

I don't understand what is the problem?

Solution

  • Problem was from my collection setter and getter methods name. It issolved.