CODEWITHSUNDEEP
javaspringtransactionsspring-transactions
VsSekorin
VsSekorin

Reputation: 375

How to fix LazyInitializationException - no Session in Spring application?

In Spring application sometimes I have exception: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role ... could not initialize proxy - no Session on client.getCatIdSet. I can't test fetch = FetchType.EAGER fix problem or not, because this error occurs not constantly. Class have Transactional annotation, method is public. How I can fix this exception?

@Service
@Transactional
public class ChatService {
    @PersistenceContext
    EntityManager entityManager;

    public BotRequest getBotRequest(MessageData messageData) {
        Client client = messageData.getMessage().getClient();
        Optional<CatId> mbCatId = Optional.ofNullable(client.getCatIdSet())
                .orElse(Collections.emptySet())
                .filter
                ...

This method invoke from:

@Service
public class SendMsgToCatBotService extends SendMsgToBotService {
    @Override
    protected BotRequest createBotRequest(MessageData messageData) {
        return chatService.getBotRequest(messageData);
    }

Client entity:

@Entity
@Table(name = "clients")
public class Client implements Serializable {
    private int id;
    private Set<CatId> catIdSet;

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "clients_generation")
    @SequenceGenerator(name = "clients_generation", sequenceName = "clients_id_seq", allocationSize = 1)
    @Column(name = "id")
    public int getId() {
        return id;
    }

    @OneToMany(mappedBy = "client")
    public Set<CatId> getCatIdSet() {
        return catIdSet;
    }

Upvotes: 0

Views: 108

Answers (1)

SivaStack
SivaStack

Reputation: 11

In your web.xml, add below filter.

<filter>
  <filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
  <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Upvotes: 1

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