many-to-one

I am doing Many To One relationship using JPA . While deleting child object from Child table it's throwing exception. Below is My code: Project.java @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="id") private int id; @Column(name="projectName") private String projectName; @Column(name="projectDesc") private String projectDesc; @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER) @JoinColumn(name="companyId") Company.java @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="id") private int id; @Column(name="compName") private String compName; @Column

Following thread [entities cannot be cast to javassist.util.proxy.Proxy, i do have now a server side error ( tks thomas) I wasn't able to face the real problem within my app. java.lang.ClassCastException: org.nit.persistance.entities.Manufacturers_.$$_javassist_3 cannot be cast to javassist.util.proxy.Proxy at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:148) at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:73) at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy

With the following: //User class... @ManyToOne(cascade=CascadeType.REMOVE) @JoinColumn(name="INSTITUTION_ID") public void setInstitution(final Institution institution) { this.institution = institution; } Does this mean deleting a User object would remove the Institution object associated with it? If that is the case I don't follow why this would be needed. Say for example that the institution had many users. Does this mean that deleting one of those Users deletes the institution, in which case all the other Users lose it aswell? You are right, it is rarely (if ever) needed and not portable

I did a small application with more relationships. Now I want to delete details of my table how can I delete I don't get any Idea to delete. Relationships are like below: PanCard-->Employee (Ono To One) Employee-->ProjectManger (bi-directional many-to-one association to Employee) Projects -->ProjectManager(bi-directional many-to-one association to Projects) Now I want delete the data of one by one table data Below is my POJO classes Code: PanCard.java @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="id") private int id; @Column(name="pName") private String pName; @Column

I am using Hibernate with spring. I have a model-class like this. @Entity @Table(name = "forumtopic") public final class Forumtopic extends AbstractUserTracking implements java.io.Serializable { /**SNIP **/ private Forumcategory forumcategory; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "FkForumcategoryId", nullable = false) public Forumcategory getForumcategory() { return this.forumcategory; } public void setForumcategory(final Forumcategory forumcategory) { this.forumcategory = forumcategory; } } It works in general, but the Category is not loaded lazy, but eagerly after the

I’m trying to map the inheritance from the superclass LendingLine and the subclasses Line and BlockLine. LendingLine has an ManyToOne association with Lending. When I try to get the LendingLines from the database without the inheritance it works fine. The association works also. But when i add the inheritance, lendingLines in Lending is empty. I also can't get any LendingLines from the DB with the inheritance. Can anybody help me? (Sorry for the bad explanation) Thanks in advance! LendingLine: @Entity @Inheritance(strategy=InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="TYPE")