Exception while iterating over PersistentSet in Hibernate

Question

I have the following simple code iterating over a PersistentSet:

if (workers instanceof PersistentSet) {
    for (Object worker : workers) { // failed to lazily initialize a collection of role: ...

    }
}

I get the following exception:

failed to lazily initialize a collection of role...

What is the wrong thing in my code?

Please send full stack trace, your query and relevant part of model (workers are not just Objects, they are instances of some class that you implemented). — AlexR
– AlexR, Commented Dec 8, 2014 at 7:14

Tkachuk_Evgen · Accepted Answer · 2014-12-08 07:17:40Z

1

You need add to your field mapping fetch = FetchType.EAGER.Hibernate use Lazy-loading by default.

answered Dec 8, 2014 at 7:17

Tkachuk_Evgen

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Rohit Gaikwad · Accepted Answer · 2022-10-27 18:11:03Z

0

Adding a code snippet on top of @Tkachuk_Evgen's answer to set FetchType.EAGER and retrieve it.

@ElementCollection(fetch = FetchType.EAGER)
@CollectionTable(name = "mytable", joinColumns = @JoinColumn(name = "e_id"))
private Set<String> employees;
.....

Fetch:

SelectionQuery<QuestionSet> query =  
(SelectionQuery<QuestionSet>) session.createSelectionQuery("from Employee");
    
Set<QuestionSet> set = 
query.getResultStream().collect(Collectors.toSet());

answered Oct 27, 2022 at 18:11

Rohit Gaikwad

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