Hello,
I am trying to remove and element from a list but I don't get it.
I have a category and details for this category.

Relevant code for Category:

@Entity
@Table(name = "category", catalog = "CartStore", uniqueConstraints = {})
public class Category implements java.io.Serializable {
 // Fields
 private long id;
 private String name;
 private String description;
 private String sortDescripcion;
 private Long creatorId;
 private Date creationDate;
 private Date modificationDate;
 private CategoryContext categoryContext = null;
...
 @Id @GeneratedValue
 @Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
 public long getId() {
 return this.id;
 }

 public void setId(long id) {
 this.id = id;
 }
....
 @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy = "category")
 public Set<CategoryDetails> getCategoryDetailses() {
 return this.categoryDetailses;
 }

 public void setCategoryDetailses(Set<CategoryDetails> categoryDetailses) {
 this.categoryDetailses = categoryDetailses;
 }

Relevant code for CategoryDetail:

@Entity
@Table(name = "category_details", catalog = "CartStore", uniqueConstraints = {})
public class CategoryDetails implements java.io.Serializable {
 // Fields
 private long id;
 private Category category;
 private String name;
 private String value;
 private String type;
....
 @Id @GeneratedValue
 @Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
 public long getId() {
 return this.id;
 }

 public void setId(long id) {
 this.id = id;
 }
.....
 @ManyToOne(cascade = {}, fetch = FetchType.LAZY)
 @JoinColumn(name = "category_id", unique = false, nullable = false, insertable = true, updatable = false)
 public Category getCategory() {
 return this.category;
 }

 public void setCategory(Category category) {
 this.category = category;
 }

The code I run:

tm.begin();
 CategoryDetails categoryDetail = em.find(CategoryDetails.class, idCategoryDetail);
 categoryDetail.setName("To remove");
 Category category = categoryDetail.getCategory();
 Set categoryDetails = category.getCategoryDetailses();
 for(Iterator it = categoryDetails.iterator(); it.hasNext();) {
 CategoryDetails cdx = (CategoryDetails)it.next();
 cdx.getId(); // Lazy
 }
 categoryDetails.remove(categoryDetail);
 categoryDetail.setCategory(null);
 category.setCategoryDetailses(categoryDetails);
 em.merge(category);
 tm.commit();

The element is not removed and sentece sql that I see is:

2007-11-20 00:02:54,375 [main] DEBUG org.hibernate.SQL -
 update
 CartStore.category_details
 set
 name=?,
 value=?,
 type=?
 where
 id=?
Hibernate:
 update
 CartStore.category_details
 set
 name=?,
 value=?,
 type=?
 where
 id=?

What i am doing bad?

Thank you.