org.hibernate.LazyInitializationException：无法延迟初始化role：ticketCircuitInfo的集合，无法初始化代理-没有会话

Question

I have 2 bean classes( ticketEntity , ticketCircuitInfo ) mapped to 1 table each

I also have 1 ticketEntity(primary key) that can have multiple ticketCircuitInfo(forign key)

The ticketEntity bean has the following properties:

@Id
@Column(name = "ticket_id", unique = true, nullable = false)
private String ticketId;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "ticket", cascade      =CascadeType.ALL)
private Set<TicketCircuitInfo> ticketCircuitInfo;

The ticketCircuitInfo bean has the following properties:

@GenericGenerator(name = "generator", strategy = "foreign",
parameters = @Parameter(name = "property", value = "ticket"))
@Id
@Column(name = "ticket_id", unique = true, nullable = false)
private String ticketId;
@ManyToOne(fetch = FetchType.LAZY)
@PrimaryKeyJoinColumn
private TicketEntity ticket;`

I'm getting:

com.sun.jdi.InvocationException occurred invoking method.

While debugging on the line ticket.ticketCircuitInfo() .

further exception being printed is:

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role:ticketCircuitInfo, could not initialize proxy - no Session

Answer 1

You should look into your service layer and add @Transactional to the service layer method..

Please refer to : How to solve the “failed to lazily initialize a collection of role” Hibernate exception

Answer 2

You can change from

@ManyToOne(fetch = FetchType.LAZY)

to

@ManyToOne(fetch = FetchType.EAGER)