one-to-many

I am using JPA-Hibernate at the moment and want collections to be empty until i call the associated get(). I have been trying for several days now without any success. The reason i want this is because i use Exterialize (or Serialize) and do not always want the collections to be there when sending the serialized string over to the client. @Entity public class Thread implements Externalizable { static final long serialVersionUID = 9L; @OneToMany(mappedBy = "parentThread", fetch = FetchType.LAZY) @LazyCollection(LazyCollectionOption.EXTRA) public Collection<Reply> getReplies() { return replies;

I'm using Spring(xml+annotations), Hibernate(annotations) in this web service project. The database relationship diagram, models, expected and actual output are given below, Database Table relationship Customer.java @Entity @Table(name="customer") public class Customer implements Serializable{ private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="customer_id", unique=true, nullable =false) long customerId; @Column(name="name") String name; @Column(name="secondary_name") String secondaryName; @Column(name="date") Date date; @Column

I have a JPA code with OneToMany relationship. A Customer has a list of Item to check out. However, the code continue to generate StackOverflowError . Once, I had resolved this one by applying @JsonIgnore while fetching the List<Item> from Customer entity. But even that does not seem to work anymore. In Customer class: @OneToMany(mappedBy = "customer", orphanRemoval = true) @JsonIgnore private List<Item> items; In Item class: @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "CUSTOMER_ID", nullable = false) private Customer customer; And CustomerRest class: @Path("customers") public class

I have two grails domain classes Class MultipleChoiceQuestion { String question static constraints = { ... } static hasMany = [options:MultipleChoiceOption] } and class MultipleChoiceOption{ String answerOption boolean correctOption MultipleChoiceQuestion question static constraints = { ... } } I want my users to be able to create a question then add atleast 3 options without navigating/clicking on different screens. My first question is must I generate view and start editing code? And if the answer to question above is yes then my second question is, what's the best way to save a question

This is my annotation I use to generate my Join Table. @OneToMany(cascade = CascadeType.ALL) @JoinTable(name = "service_operations", joinColumns = { @JoinColumn(name = "serviceId") }, inverseJoinColumns = { @JoinColumn(name = "operationId") }) public Set<Operation> getOperations() { return operations; } Considering this is a OneToMany association, my natural assumption is that this table would generate a [ Primary Key | Foreign Key ] table, however everytime I drop and re create the database it is not the case: mysql> describe workflow_services; +-------------+------------+------+-----+-------

I am using javax.persistence.OneToMany relationship in a Parent Child relationship. The parent Id is coming as null, I have read through all the related post in Stackoverflow but not getting any clue what I am missing. All the Corresponding PKs are getting populated in both Parent & Child tables as per the Sequence Provided, but the FK is set to null in Child table Parent Class: @Entity @Table(name = "DIVERSITY_TEMPLATE") public class DiversityTemplate implements Serializable { private static final long serialVersionUID = 1L; @Id @SequenceGenerator(name = "DIVERSITY_TEMPLATE_ID", sequenceName