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Cannot solve hibernate error QuerySyntaxException: designs is not mapped [from designs]

I'm using hibernate for my final project. I have a table called designs for store all the details of artworks. In the explore page i need to get all the designs from the database using hibernate. So i created a java class called designModal.java,
public class designModal {
SessionFactory sf;
public designModal() {
sf = connection.NewHibernateUtil.getSessionFactory();
}
public String[] getAllDesigns() {
String result[] = new String[8];
try {
Session ses = sf.openSession();
Transaction tr = ses.beginTransaction();
List<Designs> designList = ses.createQuery("from designs").list();
for (Designs designs : designList) {
result[0]= designs.getDesignId().toString();
result[1]= designs.getTitle();
result[2]= designs.getImage();
result[3]= designs.getDescription();
result[4]= designs.getPrice().toString();
result[5]= designs.getViews().toString();
result[6]= designs.getLikes().toString();
result[7]= designs.getDesigners().toString();
}
tr.commit();
ses.flush();
ses.close();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(result[0]+""+result[1]+""+result[3]);
return result;
}
}
Then i called this method in my page,
<%#page import="modal.designModal"%>
<%
String result[] = new designModal().getAllDesigns();
out.print(result.length);
%>
but i got an exception : QuerySyntaxException: designs is not mapped [from designs]
I followed some SO questions but that not helped. So I created a new web project,but still not solved. What is the wrong here ? Thank you
Design.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Oct 11, 2016 1:11:09 PM by Hibernate Tools 3.6.0 -->
<hibernate-mapping>
<class name="pojos.Designs" table="designs" catalog="design">
<id name="designId" type="java.lang.Integer">
<column name="design_id" />
<generator class="identity" />
</id>
<many-to-one name="designers" class="pojos.Designers" fetch="select">
<column name="designer_id" not-null="true" />
</many-to-one>
<many-to-one name="galleries" class="pojos.Galleries" fetch="select">
<column name="gallery_id" not-null="true" />
</many-to-one>
<property name="title" type="string">
<column name="title" length="45" />
</property>
<property name="image" type="string">
<column name="image" length="100" />
</property>
<property name="description" type="string">
<column name="description" length="500" />
</property>
<property name="price" type="java.lang.Double">
<column name="price" precision="22" scale="0" />
</property>
<property name="views" type="java.lang.Integer">
<column name="views" />
</property>
<property name="likes" type="java.lang.Integer">
<column name="likes" />
</property>
<set name="buysRegisters" table="buys_register" inverse="true" lazy="true" fetch="select">
<key>
<column name="design_id" not-null="true" />
</key>
<one-to-many class="pojos.BuysRegister" />
</set>
</class>
</hibernate-mapping>
Design.java
package pojos;
// Generated Oct 11, 2016 1:11:09 PM by Hibernate Tools 3.6.0
import java.util.HashSet;
import java.util.Set;
/**
* Designs generated by hbm2java
*/
public class Designs implements java.io.Serializable {
private Integer designId;
private Designers designers;
private Galleries galleries;
private String title;
private String image;
private String description;
private Double price;
private Integer views;
private Integer likes;
private Set buysRegisters = new HashSet(0);
public Designs() {
}
public Designs(Designers designers, Galleries galleries) {
this.designers = designers;
this.galleries = galleries;
}
public Designs(Designers designers, Galleries galleries, String title, String image, String description, Double price, Integer views, Integer likes, Set buysRegisters) {
this.designers = designers;
this.galleries = galleries;
this.title = title;
this.image = image;
this.description = description;
this.price = price;
this.views = views;
this.likes = likes;
this.buysRegisters = buysRegisters;
}
public Integer getDesignId() {
return this.designId;
}
public void setDesignId(Integer designId) {
this.designId = designId;
}
public Designers getDesigners() {
return this.designers;
}
public void setDesigners(Designers designers) {
this.designers = designers;
}
public Galleries getGalleries() {
return this.galleries;
}
public void setGalleries(Galleries galleries) {
this.galleries = galleries;
}
public String getTitle() {
return this.title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return this.image;
}
public void setImage(String image) {
this.image = image;
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public Double getPrice() {
return this.price;
}
public void setPrice(Double price) {
this.price = price;
}
public Integer getViews() {
return this.views;
}
public void setViews(Integer views) {
this.views = views;
}
public Integer getLikes() {
return this.likes;
}
public void setLikes(Integer likes) {
this.likes = likes;
}
public Set getBuysRegisters() {
return this.buysRegisters;
}
public void setBuysRegisters(Set buysRegisters) {
this.buysRegisters = buysRegisters;
}
}
HibernateUtil.java
package connection;
public class NewHibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from standard (hibernate.cfg.xml)
// config file.
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Log the exception.
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}

Change:
List<Designs> designList = ses.createQuery("from designs").list();
to:
List<Designs> designList = ses.createQuery("from Designs d").list();

Hibernate: could not initialize proxy - no Session (through reference chain....)

Note: Before anyone complain about this is a duplicate, make sure to go through the content without judging by title. Also make sure to read your reference question and the answer carefully to see whether it is duplicate. As of my experience now, the issue in this question can happen under different environments. For an example, the answer for someone using the below code in jsp will be different, for someone using Spring will be different and for someone whose DB is small and eager load is fine will be different. And no, my situation is not any of them.
I am writing a REST api using Hibernateand Jersey. Please have a look at the below code.
VerificationCodeJSONService.java - The JSON Service class
#Path("/verificaion_code")
public class VerificationCodeJSONService {
#GET
#Path("/getAllVerificationCodes")
#Produces(MediaType.APPLICATION_JSON)
public List<VerificaionCode> getAllVerificationCodes() {
VerificationCodeService verificationCodeService=new VerificationCodeService();
List<VerificaionCode> list = verificationCodeService.getAllVerificationCodes();
return list;
}
}
VerificationCodeService.java - The Service Layer
public class VerificationCodeService {
private static VerificationCodeDAOInterface verificationCodeDAOInterface;
public VerificationCodeService() {
verificationCodeDAOInterface = new VerificationCodeDAOImpl();
}
public List<VerificaionCode> getAllVerificationCodes() {
Session session = verificationCodeDAOInterface.openCurrentSession();
Transaction transaction = null;
List<VerificaionCode> verificaionCodes = new ArrayList<VerificaionCode>();
try {
transaction = verificationCodeDAOInterface.openTransaction(session);
verificaionCodes = verificationCodeDAOInterface.getAllVerificationCodes(session);
transaction.commit();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
session.close();
}
return verificaionCodes;
}
}
VerificationCodeDAOImpl.java - The database layer
public class VerificationCodeDAOImpl implements VerificationCodeDAOInterface{
private static final SessionFactoryBuilder sessionFactoryBuilder = SessionFactoryBuilder.getInstance();
#Override
public List<VerificaionCode> getAllVerificationCodes(Session session) {
List<VerificaionCode> verificaionCodes=(List<VerificaionCode>)session.createQuery("from VerificaionCode").list();
return verificaionCodes;
}
}
VerificationCode.java - The DAO layer
public class VerificaionCode implements java.io.Serializable {
private Integer idverificaionCode;
private Patient patient;
private String code;
private Date dateCreated;
private Date lastUpdated;
public VerificaionCode() {
}
public VerificaionCode(Patient patient, String code, Date lastUpdated) {
this.patient = patient;
this.code = code;
this.lastUpdated = lastUpdated;
}
public VerificaionCode(Patient patient, String code, Date dateCreated, Date lastUpdated) {
this.patient = patient;
this.code = code;
this.dateCreated = dateCreated;
this.lastUpdated = lastUpdated;
}
public Integer getIdverificaionCode() {
return this.idverificaionCode;
}
public void setIdverificaionCode(Integer idverificaionCode) {
this.idverificaionCode = idverificaionCode;
}
public Patient getPatient() {
return this.patient;
}
public void setPatient(Patient patient) {
this.patient = patient;
}
public String getCode() {
return this.code;
}
public void setCode(String code) {
this.code = code;
}
public Date getDateCreated() {
return this.dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public Date getLastUpdated() {
return this.lastUpdated;
}
public void setLastUpdated(Date lastUpdated) {
this.lastUpdated = lastUpdated;
}
}
Patient.java - The DAO layer
public class Patient implements java.io.Serializable {
private Integer idpatient;
private DiabetesType diabetesType;
private Language language;
private String customId;
private String diabetesOther;
private String firstName;
private String lastName;
private String email;
private Date dob;
private String parentEmail;
private String gender;
private Date diagnosedDate;
private Double height;
private Double weight;
private String heightUnit;
private String weightUnit;
private String theme;
private String userName;
private String password;
private Date dateCreated;
private Date lastUpdated;
public Patient() {
}
public Patient(DiabetesType diabetesType, Language language, String customId, String firstName, String email, Date dob, String gender, String theme, String userName, String password, Date lastUpdated) {
this.diabetesType = diabetesType;
this.language = language;
this.customId = customId;
this.firstName = firstName;
this.email = email;
this.dob = dob;
this.gender = gender;
this.theme = theme;
this.userName = userName;
this.password = password;
this.lastUpdated = lastUpdated;
}
public Integer getIdpatient() {
return this.idpatient;
}
public void setIdpatient(Integer idpatient) {
this.idpatient = idpatient;
}
public DiabetesType getDiabetesType() {
return this.diabetesType;
}
public void setDiabetesType(DiabetesType diabetesType) {
this.diabetesType = diabetesType;
}
public Language getLanguage() {
return this.language;
}
public void setLanguage(Language language) {
this.language = language;
}
public String getCustomId() {
return this.customId;
}
public void setCustomId(String customId) {
this.customId = customId;
}
public String getDiabetesOther() {
return this.diabetesOther;
}
public void setDiabetesOther(String diabetesOther) {
this.diabetesOther = diabetesOther;
}
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getDob() {
return this.dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
public String getParentEmail() {
return this.parentEmail;
}
public void setParentEmail(String parentEmail) {
this.parentEmail = parentEmail;
}
public String getGender() {
return this.gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public Date getDiagnosedDate() {
return this.diagnosedDate;
}
public void setDiagnosedDate(Date diagnosedDate) {
this.diagnosedDate = diagnosedDate;
}
public Double getHeight() {
return this.height;
}
public void setHeight(Double height) {
this.height = height;
}
public Double getWeight() {
return this.weight;
}
public void setWeight(Double weight) {
this.weight = weight;
}
public String getHeightUnit() {
return this.heightUnit;
}
public void setHeightUnit(String heightUnit) {
this.heightUnit = heightUnit;
}
public String getWeightUnit() {
return this.weightUnit;
}
public void setWeightUnit(String weightUnit) {
this.weightUnit = weightUnit;
}
public String getTheme() {
return this.theme;
}
public void setTheme(String theme) {
this.theme = theme;
}
public String getUserName() {
return this.userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return this.password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getDateCreated() {
return this.dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public Date getLastUpdated() {
return this.lastUpdated;
}
public void setLastUpdated(Date lastUpdated) {
this.lastUpdated = lastUpdated;
}
}
Below are my Hibernate mapping files for the above POJOs
VerificaionCode.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 23, 2016 3:21:00 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.VerificaionCode" table="verificaion_code" catalog="myglukose" optimistic-lock="version">
<id name="idverificaionCode" type="java.lang.Integer">
<column name="idverificaion_code" />
<generator class="identity" />
</id>
<many-to-one name="patient" class="beans.Patient" fetch="select">
<column name="patient_idpatient" not-null="true" />
</many-to-one>
<property name="code" type="string">
<column name="code" length="45" not-null="true" />
</property>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
Patient.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 23, 2016 3:21:00 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.Patient" table="patient" catalog="myglukose" optimistic-lock="version">
<id name="idpatient" type="java.lang.Integer">
<column name="idpatient" />
<generator class="identity" />
</id>
<many-to-one name="diabetesType" class="beans.DiabetesType" fetch="select">
<column name="diabetes_type_iddiabetes_type" not-null="true" />
</many-to-one>
<many-to-one name="language" class="beans.Language" fetch="select">
<column name="language_idlanguage" not-null="true" />
</many-to-one>
<property name="customId" type="string">
<column name="custom_id" length="45" not-null="true" />
</property>
<property name="diabetesOther" type="string">
<column name="diabetes_other" length="45" />
</property>
<property name="firstName" type="string">
<column name="first_name" length="100" not-null="true" />
</property>
<property name="lastName" type="string">
<column name="last_name" length="100" />
</property>
<property name="email" type="string">
<column name="email" length="45" not-null="true" />
</property>
<property name="dob" type="date">
<column name="dob" length="10" not-null="true" />
</property>
<property name="parentEmail" type="string">
<column name="parent_email" length="45" />
</property>
<property name="gender" type="string">
<column name="gender" length="45" not-null="true" />
</property>
<property name="diagnosedDate" type="date">
<column name="diagnosed_date" length="10" />
</property>
<property name="height" type="java.lang.Double">
<column name="height" precision="22" scale="0" />
</property>
<property name="weight" type="java.lang.Double">
<column name="weight" precision="22" scale="0" />
</property>
<property name="heightUnit" type="string">
<column name="height_unit" length="45" />
</property>
<property name="weightUnit" type="string">
<column name="weight_unit" length="45" />
</property>
<property name="theme" type="string">
<column name="theme" length="45" not-null="true" />
</property>
<property name="userName" type="string">
<column name="user_name" length="45" not-null="true" />
</property>
<property name="password" type="string">
<column name="password" length="45" not-null="true" />
</property>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="19" not-null="true">
<comment>Stores the basic information of the patient</comment>
</column>
</property>
</class>
</hibernate-mapping>
However when I run this code via http://localhost:8080/example_rest/rest/verificaion_code/getAllVerificationCodes I am getting the below error.
could not initialize proxy - no Session (through reference chain: java.util.ArrayList[0]->beans.VerificaionCode["patient"]->beans.Patient_$$_jvst40f_7["diabetesType"])
As you can see diabetesType is an Object (Foreign Key) in the patient's table and has nothing to do with VerificationCode. How can I fix this up?
Please note that this is a REST API. So I can't load these in a JSP like in a web app.
Update
As #Kayaman recommended, I made the updates by making null. Please check the below code. I noticed that verificaionCodes.get(i).getPatient().set...(null) makes the same error as above, so I tried below which started working fine.
VerificationCodeService.java
public List<VerificaionCode> getAllVerificationCodes() {
Session session = verificationCodeDAOInterface.openCurrentSession();
Transaction transaction = null;
List<VerificaionCode> verificaionCodes = new ArrayList<VerificaionCode>();
try {
transaction = verificationCodeDAOInterface.openTransaction(session);
verificaionCodes = verificationCodeDAOInterface.getAllVerificationCodes(session);
transaction.commit();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
session.close();
for(int i=0;i<verificaionCodes.size();i++)
{
Patient p = new Patient();
System.out.println(verificaionCodes.get(i).getPatient().getIdpatient());
Integer idpatient = verificaionCodes.get(i).getPatient().getIdpatient();
p.setIdpatient(idpatient);
verificaionCodes.get(i).setPatient(p);
}
}
return verificaionCodes;
}

How to insert data to multiple table at once in hibernate using java

Hi I am using hibernate to save data into two tables on a database .Also, I am using mysql .
These are my POJO classes,
Patient.java
public class Patient implements java.io.Serializable {
private Integer idPatient;
private String title;
private String firstName;
private String lastName;
private String middleName;
private Date dob;
private Boolean martitalStatus;
private String gender;
private String nic;
private Date dateCreated;
private Date lastUpdated;
private Set<Contact> contacts = new HashSet<Contact>(0);
public Patient() {
}
public Patient(Date lastUpdated) {
this.lastUpdated = lastUpdated;
}
public Patient(String title, String firstName, String lastName, String middleName, Date dob, Boolean martitalStatus, String gender, String nic, Date dateCreated, Date lastUpdated, Set<Contact> contacts) {
this.title = title;
this.firstName = firstName;
this.lastName = lastName;
this.middleName = middleName;
this.dob = dob;
this.martitalStatus = martitalStatus;
this.gender = gender;
this.nic = nic;
this.dateCreated = dateCreated;
this.lastUpdated = lastUpdated;
this.contacts = contacts;
}
public Integer getIdPatient() {
return this.idPatient;
}
public void setIdPatient(Integer idPatient) {
this.idPatient = idPatient;
}
public String getTitle() {
return this.title;
}
public void setTitle(String title) {
this.title = title;
}
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getMiddleName() {
return this.middleName;
}
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
public Date getDob() {
return this.dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
public Boolean getMartitalStatus() {
return this.martitalStatus;
}
public void setMartitalStatus(Boolean martitalStatus) {
this.martitalStatus = martitalStatus;
}
public String getGender() {
return this.gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getNic() {
return this.nic;
}
public void setNic(String nic) {
this.nic = nic;
}
public Date getDateCreated() {
return this.dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public Date getLastUpdated() {
return this.lastUpdated;
}
public void setLastUpdated(Date lastUpdated) {
this.lastUpdated = lastUpdated;
}
public Set<Contact> getContacts() {
return this.contacts;
}
public void setContacts(Set<Contact> contacts) {
this.contacts = contacts;
}
}
Contact.java
public class Contact implements java.io.Serializable {
private Integer idContact;
private Patient patient;
private String telephone;
private String address;
public Contact() {
}
public Contact(Patient patient) {
this.patient = patient;
}
public Contact(Patient patient, String telephone, String address) {
this.patient = patient;
this.telephone = telephone;
this.address = address;
}
public Integer getIdContact() {
return this.idContact;
}
public void setIdContact(Integer idContact) {
this.idContact = idContact;
}
public Patient getPatient() {
return this.patient;
}
public void setPatient(Patient patient) {
this.patient = patient;
}
public String getTelephone() {
return this.telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
public String getAddress() {
return this.address;
}
public void setAddress(String address) {
this.address = address;
}
}
Also I am not using annotations in here.
Patient patient=new Patient();
Contact contact=new Contact();
Set<Contact> contacts=new HashSet<Contact>();
contact.setTelephone("0358965458");
contact.setAddress("Horana");
contacts.add(contact);
patient.setFirstName("Wajira");
patient.setLastName("Dahanushka");
patient.setDateCreated(Common.getSQLCurrentTimeStamp());
patient.setLastUpdated(Common.getSQLCurrentTimeStamp());
patient.setGender("Male");
patient.setTitle("Mr");
patient.setNic("9115580466v");
patient.setContacts(contacts);
SessionFactory sessionFactory=new HibernateUtil().getSessionFactory();
Session session=sessionFactory.openSession();
session.beginTransaction();
session.persist(patient);
session.getTransaction().commit();
HibernateUtil.shutdown();
Patient.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 8, 2016 9:56:01 AM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="db.Patient" table="patient" catalog="example_hibernate" optimistic-lock="version">
<id name="idPatient" type="java.lang.Integer">
<column name="idPatient" />
<generator class="identity" />
</id>
<property name="title" type="string">
<column name="title" length="45" />
</property>
<property name="firstName" type="string">
<column name="firstName" length="45" />
</property>
<property name="lastName" type="string">
<column name="lastName" length="45" />
</property>
<property name="middleName" type="string">
<column name="middleName" length="45" />
</property>
<property name="dob" type="date">
<column name="dob" length="10" />
</property>
<property name="martitalStatus" type="java.lang.Boolean">
<column name="martitalStatus" />
</property>
<property name="gender" type="string">
<column name="gender" length="45" />
</property>
<property name="nic" type="string">
<column name="nic" length="45" />
</property>
<property name="dateCreated" type="timestamp">
<column name="dateCreated" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="lastUpdated" length="19" not-null="true" />
</property>
<set name="contacts" table="contact" inverse="true" lazy="true" fetch="select">
<key>
<column name="idPatient" not-null="true" />
</key>
<one-to-many class="db.Contact" />
</set>
</class>
</hibernate-mapping>
Contact.hbm.xml
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 8, 2016 9:56:01 AM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="db.Contact" table="contact" catalog="example_hibernate" optimistic-lock="version">
<id name="idContact" type="java.lang.Integer">
<column name="idContact" />
<generator class="identity" />
</id>
<many-to-one name="patient" class="db.Patient" fetch="select">
<column name="idPatient" not-null="true" />
</many-to-one>
<property name="telephone" type="string">
<column name="telephone" length="45" />
</property>
<property name="address" type="string">
<column name="address" length="45" />
</property>
</class>
</hibernate-mapping>
Contact table has a foreign key which is the primary key of the patient table.
When I run above code , A new patient record could see in patient table but couldn't see any new contact record in contact table .
Is there anything wrong.
Have any ideas .

You need to tell Hibernate that you have a one to many relationship betweens patients and their contacts. After you have done this, persisting a Patient object should also persist the entire graph of that patient. If you were using annotations, then something like this should work:
#Entity
#Table(name="Patient")
public class Patient {
#OneToMany(mappedBy="patient")
private Set<Contact> contacts;
}
#Entity
#Table(name="Contact")
public class Contact {
#ManyToOne
private Patient patient;
}

in Patient.hbm.xml
while mentioning the set for contacts, use the following cascade property
<set name="contacts" table="contact" cascade="save-update" inverse="true" lazy="true" fetch="select">
<key>
<column name="idPatient" not-null="true" />
</key>
<one-to-many class="db.Contact" />
</set>
By mentioning cascade as save-update, you just have to invoke session.save(patientObj), and contact details will automatically get persisted.
Check this link for complete reference of cascading updates/inserts/delete operation in hibernate associations.

Hibernate errors: "java.lang.Integer cannot be cast to java.lang.String" and so on

I have situation where a movie can have lots of reviews, but a review is only ever related to one movie. I have had the issue as stated below, but as I have now tried so many permutations, I am actually little confused, so before I mess with my code anymore I thought it best to ask here.
Q.How should this be set up? Can I just hard set an movie_id as an int, in the review before I save a review? Or do I need to have a MovieDTO movie object as one of the objects in ReviewDTO class? And when I create a review object to be saved, that I call review.setMovie(someMovieObject)?
So here is what was going on in my code with errors:
First it complained that a not-null movie reference was not set (Hibernate : not-null property references a null or transient value), so after not being able to fix it, someone suggested to remove the constraint, to see if it would work.
Now it complains "java.lang.Integer cannot be cast to java.lang.String", but i am confused where there is the type mismatch? Class<->Hibernate or Hibernate<->DB?
Very confused, can someone please shed some light...? Thanks in advance.
package edu.unsw.comp9321.jdbc;
public class ReviewDTO {
private int id;
private String review;
private String rating;
private int client_id;
private int movie_id;
public ReviewDTO() {
}
public ReviewDTO(int id, String review, String rating, int client_id, int movie_id) {
super();
this.id = id;
this.review = review;
this.rating = rating;
this.client_id = client_id;
this.movie_id = movie_id;
}
public int getid() {
return id;
}
public void setid(int id) {
this.id = id;
}
public String getReview() {
return review;
}
public void setReview(String review) {
this.review = review;
}
public String getRating() {
return rating;
}
public void setRating(String rating) {
this.rating = rating;
}
public int getClient_id() {
return client_id;
}
public void setClient_id(String client_id) {
this.client_id = new Integer(client_id);
}
public int getMovie_id() {
return movie_id;
}
public void setMovie_id(int movie_id) {
this.movie_id = movie_id;
}
}
package edu.unsw.comp9321.jdbc;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.OneToMany;
public class MovieDTO implements Comparable {
private int id;
private String title;
private String poster;
private String director;
private String actors;
private String synopsis;
private String release_date;
private int cinema_id;
private Set<GenreDTO> genres = new HashSet<GenreDTO>();
private Set<ReviewDTO> reviews = new HashSet<ReviewDTO>();
private double rating;
public MovieDTO() {
}
public MovieDTO(int id, String title, String poster, String director,
String actors, String synopsis, String release_date, double rating) {
super();
this.id = id;
this.title = title;
this.poster = poster;
this.director = director;
this.actors = actors;
this.synopsis = synopsis;
this.release_date = release_date;
this.rating = rating;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getPoster() {
return poster;
}
public void setPoster(String poster) {
this.poster = poster;
}
public String getDirector() {
return director;
}
public void setDirector(String director) {
this.director = director;
}
public String getActors() {
return actors;
}
public void setActors(String actors) {
this.actors = actors;
}
public String getSynopsis() {
return synopsis;
}
public void setSynopsis(String synopsis) {
this.synopsis = synopsis;
}
public String getRelease_date() {
return release_date;
}
public void setRelease_date(String release_date) {
this.release_date = release_date;
}
public Set<GenreDTO> getGenres() {
return genres;
}
public void setGenres(Set<GenreDTO> genres) {
this.genres = genres;
}
public Set<ReviewDTO> getReviews() {
return reviews;
}
public void setReviews(Set<ReviewDTO> reviews) {
this.reviews = reviews;
}
public int getCinema_id() {
return cinema_id;
}
public void setCinema_id(int cinema_id) {
this.cinema_id = cinema_id;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
#Override
public int compareTo(Object o) {
MovieDTO other = (MovieDTO) o;
if (this.rating > other.rating) return -1;
if (this.rating < other.rating) return 1;
return 0;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="edu.unsw.comp9321.jdbc.ReviewDTO" table="Review" >
<id column="id" name="id">
<generator class="identity" />
</id>
<property column="review" name="review" type="string" />
<property column="rating" name="rating" type="string" />
<property column="client_id" name="client_id" type="string" />
<property column="movie_id" name="movie_id" type="string" />
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="edu.unsw.comp9321.jdbc.MovieDTO" table="Movie" >
<id column="id" name="id">
<generator class="identity" />
</id>
<property column="title" name="title" type="string" />
<property column="poster" name="poster" type="string" />
<property column="director" name="director" type="string" />
<property column="actors" name="actors" type="string" />
<property column="synopsis" name="synopsis" type="string" />
<property column="release_date" name="release_date" type="string" />
<set name="genres" table="MovieHasGenre" >
<key column="movie_id" not-null="true" />
<many-to-many class="edu.unsw.comp9321.jdbc.GenreDTO" column="genre_id" />
</set>
<set name="reviews" table="Review" >
<key column="movie_id" />
<one-to-many class="edu.unsw.comp9321.jdbc.ReviewDTO" />
</set>
</class>
</hibernate-mapping>

The first error you receive is because you define <key column="movie_id" not-null="true" /> which means movie_id can not be null inside the GenreDTO of that MovieDTO. Somewhere in your code that value is null when trying to persist (not enough code shown to tell you where.)
The second error is because you define <property column="movie_id" name="movie_id" type="string" /> but in your ReviewDTO movie_id is an int. They should be the same.
As for your question, whether you should use movie_id or a MovieDTO in your ReviewDTO. That depends on a few things. Bi-directional relationships are fine (meaning ReviewDTO has a MovieDTO attached to it while that same MovieDTO has that same ReviewDTO in it's list of Reviews. However scale-ability and performance issues will happen if you have millions of entities. On the contrary leaving just movie_id Integer means anytime you want the MovieDTO object from a ReviewDTO you will have another database call... however this may not be too costly because if it was bi-directional, that call would have happened regardless.

Unable to make 'many-to-many' relation between Person and Address class

How do I make many-to-many relation between 2 classes Person and Address ? Following is the POJO for Person and Address respectively.
Person :
public class Person {
private int personID;
private String name;
private Person person;
private List addressList;
public List getAddressList() {
return addressList;
}
public void setAddressList(List addressList) {
this.addressList = addressList;
}
public int getPersonID() {
return personID;
}
public void setPersonID(int personID) {
this.personID = personID;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
Address :
public class Address {
private int addressID;
private String address;
private Person person;
public int getAddressID() {
return addressID;
}
public void setAddressID(int addressID) {
this.addressID = addressID;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
The relation I am trying to define is A person can have many addresses and one address can belong to many people.
I am unable to represent this in the mapping xml. This is what I have been able to do till now.
<hibernate-mapping>
<class name="pojo.Person" table="person">
<id name="personID" column="p_id">
<generator class="increment" />
</id>
<property name="name" column="p_name" />
<list name="addressList" table="address">
<key column="a_id" />
<!-- DEFINE MANY TO MANY --!>
</list>
</class>
<class name="pojo.Address" table="address">
<id name="addressID" column="a_id">
<generator class="" />
</id>
<property name="address" />
</class>
</hibernate-mapping>
How do I define many to many relation between these two classes ?

Add private List persons instead of private Person person in Address class.
Configure your mapping.xml like this
//For person.hbm.xml
<list name="addresses" inverse="false" table="person_address">
<key>
<column name="Person_ID" not-null="true" />
</key>
<many-to-many entity-name="domains.Address">
<column name="listAddress_ID" not-null="true" />
</many-to-many>
</list>
//For address.hbm.xml
<list name="persons" inverse="false" table="person_address">
<key>
<column name="listAddress_ID" not-null="true" />
</key>
<many-to-many entity-name="domains.Person">
<column name="Person_ID" not-null="true" />
</many-to-many>
</list>