@CollectionOfElements
@JoinTable(name = "PET", joinColumns = { @JoinColumn(name = "person_id") })
@Column(name = "petname")
private Set<String> petname = new HashSet<String>();
@CollectionTable and @ElementCollection Usage
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12-06-2023 - |
Frage
Hi Could any one please help me to resolve this exception.Here I have entity class called Person and the thisclass having the instance variable has name and petnames, here petnames I have taken as simple value type that data type is collection and have mapped by using jpa annotation, Please look at my following code and corresponding exception that is generating . And I am facing this exception from so many days.I am struggling to resolve this problem I don not understand where I am going wrong.
Person Class
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
@ElementCollection
@CollectionTable(name = "petname")
// @Column(name = "ColumnName")
private Set<String> petname = new HashSet<String>();
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void setPetname(Set<String> petname) {
this.petname = petname;
}
public Set<String> getPetname() {
return petname;
}
public boolean addPets(String p) {
return petname.add(p);
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Person)) {
return false;
}
Person other = (Person) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.myapp.struts.Person[ id=" + id + " ]";
}
Excaption
Initial SessionFactory creation failed.org.hibernate.MappingException: Could not determine type for: java.util.Set, for columns: [org.hibernate.mapping.Column(petname)]
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.myapp.struts.NewHibernateUtil.<clinit>(NewHibernateUtil.java:28)
at com.myapp.struts.Test.main(Test.java:16)
Caused by: org.hibernate.MappingException: Could not determine type for: java.util.Set, for columns: [org.hibernate.mapping.Column(petname)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:266)
aJava Result: 1
Lösung
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