Develop Reference

Hibernate: How to write Join queries including multi levels?

I am trying to write a HQL Query, which is similar to a MySQL Join. Below are my entities. As you can see below I am not using annotations in my Pojos. Instead I am using XML to do the mapping.
Stock
public class Stock implements java.io.Serializable {
private Integer idstock;
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
private Product product;
private int quantity;
private Date dateCreated;
private Date lastUpdated;
public Stock() {
}
public Stock(Product product, int quantity) {
this.product = product;
this.quantity = quantity;
}
public Stock(Product product, int quantity, Date dateCreated, Date lastUpdated) {
this.product = product;
this.quantity = quantity;
this.dateCreated = dateCreated;
this.lastUpdated = lastUpdated;
}
public Integer getIdstock() {
return this.idstock;
}
public void setIdstock(Integer idstock) {
this.idstock = idstock;
}
public Product getProduct() {
return this.product;
}
public void setProduct(Product product) {
this.product = product;
}
public int getQuantity() {
return this.quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
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;
}
}
Product
public class Product implements java.io.Serializable {
private Integer idproduct;
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
private SparePart sparePart;
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
private VehicleModel vehicleModel;
private double unitPrice;
private String qrcode;
private boolean enable;
private Integer minimumStockLevel;
private Integer stockReorderLevel;
public Product() {
}
public Product(SparePart sparePart, VehicleModel vehicleModel, double unitPrice, String qrcode, boolean enable) {
this.sparePart = sparePart;
this.vehicleModel = vehicleModel;
this.unitPrice = unitPrice;
this.qrcode = qrcode;
this.enable = enable;
}
public Product(SparePart sparePart, VehicleModel vehicleModel, double unitPrice, String qrcode, boolean enable, Integer minimumStockLevel, Integer stockReorderLevel) {
this.sparePart = sparePart;
this.vehicleModel = vehicleModel;
this.unitPrice = unitPrice;
this.qrcode = qrcode;
this.enable = enable;
this.minimumStockLevel = minimumStockLevel;
this.stockReorderLevel = stockReorderLevel;
}
public Integer getIdproduct() {
return this.idproduct;
}
public void setIdproduct(Integer idproduct) {
this.idproduct = idproduct;
}
public SparePart getSparePart() {
return this.sparePart;
}
public void setSparePart(SparePart sparePart) {
this.sparePart = sparePart;
}
public VehicleModel getVehicleModel() {
return this.vehicleModel;
}
public void setVehicleModel(VehicleModel vehicleModel) {
this.vehicleModel = vehicleModel;
}
public double getUnitPrice() {
return this.unitPrice;
}
public void setUnitPrice(double unitPrice) {
this.unitPrice = unitPrice;
}
public String getQrcode() {
return this.qrcode;
}
public void setQrcode(String qrcode) {
this.qrcode = qrcode;
}
public boolean getEnable() {
return this.enable;
}
public void setEnable(boolean enable) {
this.enable = enable;
}
public Integer getMinimumStockLevel() {
return this.minimumStockLevel;
}
public void setMinimumStockLevel(Integer minimumStockLevel) {
this.minimumStockLevel = minimumStockLevel;
}
public Integer getStockReorderLevel() {
return this.stockReorderLevel;
}
public void setStockReorderLevel(Integer stockReorderLevel) {
this.stockReorderLevel = stockReorderLevel;
}
}
VehicleModel
public class VehicleModel implements java.io.Serializable {
private Integer idvehicleModel;
private String modelName;
private String code;
private boolean enable;
public VehicleModel() {
}
public VehicleModel(String modelName, boolean enable) {
this.modelName = modelName;
this.enable = enable;
}
public Integer getIdvehicleModel() {
return this.idvehicleModel;
}
public void setIdvehicleModel(Integer idvehicleModel) {
this.idvehicleModel = idvehicleModel;
}
public String getModelName() {
return this.modelName;
}
public void setModelName(String modelName) {
this.modelName = modelName;
}
public boolean getEnable() {
return this.enable;
}
public void setEnable(boolean enable) {
this.enable = enable;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
}
SparePart
public class SparePart implements java.io.Serializable {
private Integer idsparePart;
private String sparePartName;
private String code;
private boolean enable;
public SparePart() {
}
public SparePart(String sparePartName, boolean enable) {
this.sparePartName = sparePartName;
this.enable = enable;
}
public Integer getIdsparePart() {
return this.idsparePart;
}
public void setIdsparePart(Integer idsparePart) {
this.idsparePart = idsparePart;
}
public String getSparePartName() {
return this.sparePartName;
}
public void setSparePartName(String sparePartName) {
this.sparePartName = sparePartName;
}
public boolean getEnable() {
return this.enable;
}
public void setEnable(boolean enable) {
this.enable = enable;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
}
Here are my XML mappings
Product.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 4, 2020 1:35:36 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.Product" table="product" catalog="aaa" optimistic-lock="version">
<id name="idproduct" type="java.lang.Integer">
<column name="idproduct" />
<generator class="identity" />
</id>
<many-to-one name="sparePart" class="beans.SparePart" fetch="select">
<column name="idspare_part" not-null="true" />
</many-to-one>
<many-to-one name="vehicleModel" class="beans.VehicleModel" fetch="select">
<column name="idvehicle_model" not-null="true" />
</many-to-one>
<property name="unitPrice" type="double">
<column name="unit_price" precision="22" scale="0" not-null="true">
<comment>This is the central price for a product. This can change according to the market values.</comment>
</column>
</property>
<property name="qrcode" type="string">
<column name="qrcode" length="45" not-null="true" />
</property>
<property name="enable" type="boolean">
<column name="enable" not-null="true" />
</property>
<property name="minimumStockLevel" type="java.lang.Integer">
<column name="minimum_stock_level" />
</property>
<property name="stockReorderLevel" type="java.lang.Integer">
<column name="stock_reorder_level" />
</property>
</class>
</hibernate-mapping>
Stock.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 4, 2020 1:35:36 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.Stock" table="stock" catalog="aaa" optimistic-lock="version">
<id name="idstock" type="java.lang.Integer">
<column name="idstock" />
<generator class="identity" />
</id>
<many-to-one name="product" class="beans.Product" fetch="select">
<column name="idproduct" not-null="true" />
</many-to-one>
<property name="quantity" type="int">
<column name="quantity" not-null="true" />
</property>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="0" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="0" />
</property>
</class>
</hibernate-mapping>
SparePart.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 4, 2020 1:35:36 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.SparePart" table="spare_part" catalog="aaa" optimistic-lock="version">
<id name="idsparePart" type="java.lang.Integer">
<column name="idspare_part" />
<generator class="identity" />
</id>
<property name="sparePartName" type="string">
<column name="spare_part_name" length="100" not-null="true" />
</property>
<property name="code" type="string">
<column name="code" length="100"/>
</property>
<property name="enable" type="boolean">
<column name="enable" not-null="true" />
</property>
</class>
</hibernate-mapping>
VehicleModel.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 4, 2020 1:35:36 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.VehicleModel" table="vehicle_model" catalog="aaa" optimistic-lock="version">
<id name="idvehicleModel" type="java.lang.Integer">
<column name="idvehicle_model" />
<generator class="identity" />
</id>
<property name="modelName" type="string">
<column name="model_name" length="100" not-null="true" />
</property>
<property name="code" type="string">
<column name="code" length="100"/>
</property>
<property name="enable" type="boolean">
<column name="enable" not-null="true" />
</property>
</class>
</hibernate-mapping>
Right now I have the following query.
public List<Stock> getAllStock(Session session) {
Query query = session.createQuery("FROM Stock s");
List<Stock> list = (List<Stock>) query.list();
return list;
}
This gives me,
Stock
Product of each Stock
SparePart of each Product
VehicleModel of each Product
However this is extremely slow due to the famous n+1 issue. To get data from each table, this code generated a SQL query, resulting huge amount of sql queries. The more data you have, the more queries this generates . As a result, this is a super slow process. Currently it takes 40 seconds.
Instead I need to write HQL joins and get data with a single SQL query. How can I do this?

You should use JOIN FETCH to tell JPA/Hibernate that that it should load it.
From the Hibernate docs:
If you forget to JOIN FETCH all EAGER associations, Hibernate is going
to issue a secondary select for each and every one of those which, in
turn, can lead to N+1 query issues.
For this reason, you should prefer LAZY associations.
select s from Stock s join fetch s.product p
join fetch p.sparePart sp
join fetch p.vehicleModel v
Please also read the documentation: https://docs.jboss.org/hibernate/orm/5.5/userguide/html_single/Hibernate_User_Guide.html#best-practices-fetching-associations

You can use criteria implementation of hibernate and using alias you can join
Below is some reference code that may help
Criteria c = session.createCriteria(Stock.class, "stock");
c.createAlias("stock.product", "product");//it is like inner join
c.createAlias("product.spare_part","spare_part");
c.createAlias("product.vehicle_model","vehicle_model");
return c.list();

Hibernate Proxy Error - Gson

I am using hibernate in building a Restful Web Service (CRUD) in Java.
The problem is that when I return the data (GET) in some table that has some kind of relationship, I get the following error:
HTTP Status 500 - Internal Server Error
Type Exception Report
Message java.lang.UnsupportedOperationException: Attempted to serialize java.lang.Class: org.hibernate.proxy.HibernateProxy. Forgot to register a type adapter?
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
When removing the bidirectional mapping created by hibernate on either side (table) the server returns to normal operation.
I use the Gson library to return and receive my requests in the JSON form.
Would anyone know how to solve this?
Thank you all for your help.
Here is a part of my controller code:
#GET
#Path("getConvenio")
#Produces(javax.ws.rs.core.MediaType.APPLICATION_JSON)
public String getConvenioList() {
Gson gson = new Gson();
List<Tbconveniado> l = new ArrayList();
try {
l = new ArrayList(op.getConveniadoList());
} catch (Exception ex) {
ex.printStackTrace();
}
return gson.toJson(l);
}
Following is the implementation of the "getConveniadoList" method that is present in the ConvenioOperations class:
public class ConvenioOperations {
public void setConvenio(Tbconveniado tb) {
Session s = HibernateUtil.getSessionFactory().openSession();
Transaction tx = s.beginTransaction();
s.saveOrUpdate(tb);
tx.commit();
s.close();
}
public List<Tbconveniado> getConveniadoList(){
Session s = HibernateUtil.getSessionFactory().openSession();
Transaction tx = s.beginTransaction();
List<Tbconveniado> l = null;
Query q = s.createQuery("from Tbconveniado c");
l = q.list();
tx.commit();
s.close();
return l;
}
}
Finally, the mapping and the class generated by hibernate to the table "Tbconveniado"
<hibernate-mapping>
<class name="pojos.Tbconveniado" table="tbconveniado" catalog="sindicatodb" optimistic-lock="version" >
<id name="idConveniado" type="int">
<column name="idConveniado" />
<generator class="assigned" />
</id>
<!-- foreign key -->
<many-to-one name="tbramo" class="pojos.Tbramo" fetch="select">
<column name="ramo" not-null="true" />
</many-to-one>
<property name="nome" type="string">
<column name="nome" length="100" />
</property>
<property name="dataConvenio" type="date">
<column name="dataConvenio" length="10" />
</property>
<property name="dataLimite" type="date">
<column name="dataLimite" length="10" />
</property>
<property name="endereco" type="string">
<column name="endereco" length="100" />
</property>
<property name="bairro" type="string">
<column name="bairro" length="100" />
</property>
<property name="cep" type="string">
<column name="cep" length="20" />
</property>
<property name="telefone" type="string">
<column name="telefone" length="20" />
</property>
<property name="cnpj" type="string">
<column name="cnpj" length="15" />
</property>
<property name="cidade" type="string">
<column name="cidade" length="100" />
</property>
<property name="status" type="java.lang.Integer">
<column name="status" />
</property>
<property name="email" type="string">
<column name="email" length="100" />
</property>
</class>
</hibernate-mapping>
Java Class for XML above:
public class Tbconveniado implements java.io.Serializable {
private int idConveniado;
private Tbramo tbramo;
private String nome;
private Date dataConvenio;
private Date dataLimite;
private String endereco;
private String bairro;
private String cep;
private String telefone;
private String cnpj;
private String cidade;
private Integer status;
private String email;
public Tbconveniado() {
}
public Tbconveniado(int idConveniado, Tbramo tbramo) {
this.idConveniado = idConveniado;
this.tbramo = tbramo;
}
public Tbconveniado(int idConveniado, Tbramo tbramo, String nome, Date dataConvenio, Date dataLimite, String endereco, String bairro, String cep, String telefone, String cnpj, String cidade, Integer status, String email) {
this.idConveniado = idConveniado;
this.tbramo = tbramo;
this.nome = nome;
this.dataConvenio = dataConvenio;
this.dataLimite = dataLimite;
this.endereco = endereco;
this.bairro = bairro;
this.cep = cep;
this.telefone = telefone;
this.cnpj = cnpj;
this.cidade = cidade;
this.status = status;
this.email = email;
}
public int getIdConveniado() {
return this.idConveniado;
}
public void setIdConveniado(int idConveniado) {
this.idConveniado = idConveniado;
}
public Tbramo getTbramo() {
return this.tbramo;
}
public void setTbramo(Tbramo tbramo) {
this.tbramo = tbramo;
}
public String getNome() {
return this.nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public Date getDataConvenio() {
return this.dataConvenio;
}
public void setDataConvenio(Date dataConvenio) {
this.dataConvenio = dataConvenio;
}
public Date getDataLimite() {
return this.dataLimite;
}
public void setDataLimite(Date dataLimite) {
this.dataLimite = dataLimite;
}
public String getEndereco() {
return this.endereco;
}
public void setEndereco(String endereco) {
this.endereco = endereco;
}
public String getBairro() {
return this.bairro;
}
public void setBairro(String bairro) {
this.bairro = bairro;
}
public String getCep() {
return this.cep;
}
public void setCep(String cep) {
this.cep = cep;
}
public String getTelefone() {
return this.telefone;
}
public void setTelefone(String telefone) {
this.telefone = telefone;
}
public String getCnpj() {
return this.cnpj;
}
public void setCnpj(String cnpj) {
this.cnpj = cnpj;
}
public String getCidade() {
return this.cidade;
}
public void setCidade(String cidade) {
this.cidade = cidade;
}
public Integer getStatus() {
return this.status;
}
public void setStatus(Integer status) {
this.status = status;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
}

Error executing DDL via JDBC Statement

I really need some help in hibernate, and i search all questions,but it didn't work.
My question is strange,at least I think so. In my project, i want to use entity class, hibernate xml mapping file(*.hbm.xml) and hibernate configuration file(hibernate.cfg.xml) to create table in mysql database. Strange that I have only one table can not be created, and other tables can be created successfully.
OK,These are my project code, i think these information might be used.
cart.java
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/**
* #author Ning
*
*/
public class Cart implements Serializable{
private Integer id;
private User user;
private Map<Integer, Integer> shopItems = new HashMap<>();
public Cart() {}
public Cart(User user, Map<Integer, Integer> shopItems) {
super();
this.user = user;
this.shopItems = shopItems;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Map<Integer, Integer> getShopItems() {
return shopItems;
}
public void setShopItems(Map<Integer, Integer> shopItems) {
this.shopItems = shopItems;
}
#Override
public String toString() {
return "Cart [id=" + id + ", user=" + user + ", shopItems=" + shopItems + "]";
}
}
<!------cart.hbm.xml----->
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-4-30 9:23:54 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.eshop.design.model.Cart" table="CART">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.eshop.design.model.User" fetch="join">
<column name="USER" />
</many-to-one>
<map name="shopItems">
<key column="CART_ID"></key>
<index column="PRODUCT_ID" type="java.lang.Integer"></index>
<element column="NUMBER" type="java.lang.Integer"></element>
</map>
</class>
</hibernate-mapping>
Order.java
import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
public class Order implements Serializable{
private Integer id;
private User user;
private Map<Integer, Integer> shopItems = new HashMap<>();
private Date date;
private Status status;
private String remark;
public Order() {}
public Order(User user, Map<Integer, Integer> shopItems, Date date, Status status, String remark) {
super();
this.user = user;
this.shopItems = shopItems;
this.date = date;
this.status = status;
this.remark = remark;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Map<Integer, Integer> getShopItems() {
return shopItems;
}
public void setShopItems(Map<Integer, Integer> shopItems) {
this.shopItems = shopItems;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
#Override
public String toString() {
return "Order [id=" + id + ", user=" + user + ", shopItems=" + shopItems + ", date=" + date + ", status="
+ status + ", remark=" + remark + "]";
}
}
<!-------order.hbm.xml----->
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-4-30 9:23:54 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.eshop.design.model.Order" table="ORDER">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>
<many-to-one name="user" class="com.eshop.design.model.User" fetch="join">
<column name="USER" />
</many-to-one>
<map name="shopItems">
<key column="ORDER_ID"></key>
<index column="PRODUCT_ID" type="java.lang.Integer"></index>
<element column="NUMBER" type="java.lang.Integer"></element>
</map>
<property name="date" type="java.util.Date">
<column name="DATE" />
</property>
<many-to-one name="status" class="com.eshop.design.model.Status" fetch="join">
<column name="STATUS" />
</many-to-one>
<property name="remark" type="java.lang.String">
<column name="REMARK" />
</property>
</class>
</hibernate-mapping>
<!-----user.java------>
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
public class User implements Serializable{
private Integer id;
private String login;
private String pass;
private String name;
private String phone;
private String address;
private Double assets;
// Constructors
/** default constructor */
public User() {}
/** full constructor */
public User( String login, String pass, String name, String phone, String address, Double assets) {
super();
this.login = login;
this.pass = pass;
this.name = name;
this.phone = phone;
this.address = address;
this.assets = assets;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Double getAssets() {
return assets;
}
public void setAssets(Double assets) {
this.assets = assets;
}
#Override
public String toString() {
return "User [id=" + id + ", login=" + login + ", pass=" + pass + ", name=" + name + ", phone=" + phone
+ ", address=" + address + ", assets=" + assets + "]";
}
}
<!-----user.hbm.xml---->
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-4-30 9:23:54 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.eshop.design.model.User" table="USER">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>
<property name="login" type="java.lang.String">
<column name="LOGIN" />
</property>
<property name="pass" type="java.lang.String">
<column name="PASS" />
</property>
<property name="name" type="java.lang.String">
<column name="NAME" />
</property>
<property name="phone" type="java.lang.String">
<column name="PHONE" />
</property>
<property name="address" type="java.lang.String">
<column name="ADDRESS" />
</property>
<property name="assets" type="java.lang.Double">
<column name="ASSETS" />
</property>
</class>
</hibernate-mapping>
<!-- I config the data source and session factory in the spring's configuration file applicationContext.xml-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${user}"></property>
<property name="password" value="${password}"></property>
<property name="driverClass" value="${driverClass}"></property>
<property name="jdbcUrl" value="${jdbcUrl}"></property>
<property name="minPoolSize" value="${minPoolSize}" />
<property name="maxPoolSize" value="${maxPoolSize}" />
<property name="initialPoolSize" value="${initialPoolSize}" />
</bean>
<!-- SessionFactory config -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
<property name="mappingLocations" value="classpath:com/eshop/design/model/*.hbm.xml"></property>
</bean>
<!----hibernate.cfg.xml--->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>
This is the first time I have asked questions here, some formats may be unsatisfactory.
Thanks in advance and forget my poor English.

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;
}

Could not find a getter for password in class

I am writing REST services using Java RESTLET .
I have my User class here :
#Entity
#Table(name = "user")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "idUser", nullable = false, unique = true, length = 255)
private Long idUser;
#Column(name = "name", nullable = true, length = 255)
private String name;
#Column(name = "username", nullable = false, length = 255)
private String username;
#Column(name = "password", nullable = false, length = 255)
private String password;
public Object setValue(Object input) {
Object fieldValue = ((input == null) ? JSONObject.NULL.toString()
: input);
return fieldValue;
}
public String getUserPassword() {
return password;
}
public void setUserPassword(String password) {
this.password = password;
}
public String getUserName() {
return username ;
}
public void setUserName(String userName) {
this.username = userName;
}
public Long getidUser() {
return idUser;
}
public void setIdUser(Long idUser) {
this.idUser = idUser;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContactFirstName() {
return contactFirstName;
}
public void setContactFirstName(String contactFirstName) {
this.contactFirstName = contactFirstName;
}
public String getContactLastName() {
return contactLastName;
}
public void setContactLastName(String contactLastName) {
this.contactLastName = contactLastName;
}
public String getContactEmail() {
return contactEmail;
}
public void setContactEmail(String contactEmail) {
this.contactEmail = contactEmail;
}
public String getContactMobile() {
return contactMobile;
}
public void setContactMobile(String contactMobile) {
this.contactMobile = contactMobile;
}
public String getContactPhone() {
return contactPhone;
}
public void setContactPhone(String contactPhone) {
this.contactPhone = contactPhone;
}
public String getContactAddress() {
return contactAddress;
}
public void setContactAddress(String contactAddress) {
this.contactAddress = contactAddress;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
public Integer getType() {
return type;
}
public void setType(Integer type) {
this.type = type;
}
public Timestamp getCreatedDate() {
return createdDate;
}
public void setCreatedDate(Timestamp createdDate) {
this.createdDate = createdDate;
}
public Timestamp getUpdatedDate() {
return updatedDate;
}
public void setUpdatedDate(Timestamp updatedDate) {
this.updatedDate = updatedDate;
}
}
My User.hbm.xml files looks like .
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="persistence.entity.User" table="user">
<id name="idUser" type="long" unsaved-value="null">
<column name="idUser" not-null="true"/>
<generator class="identity"/>
</id>
<property name="userName">
<column name="username" not-null="true" />
</property>
<property name="password">
<column name="password" not-null="true" />
</property>
<property name="status">
<column name="status" not-null="true" />
</property>
<property name="type">
<column name="type" not-null="true" />
</property>
<property name="createdDate">
<column name="createdDT" not-null="true" />
</property>
<property name="updatedDate">
<column name="updatedDT" not-null="false" />
</property>
<property name="name">
<column name="name" length="255" not-null="false" />
</property>
<property name="contactFirstName">
<column name="contactFirstName" length="255" not-null="false" />
</property>
<property name="contactLastName">
<column name="contactLastName" length="255" not-null="false" />
</property>
<property name="contactEmail">
<column name="contactEmail" length="255" not-null="false" />
</property>
<property name="contactMobile">
<column name="contactMobile" length="32" not-null="false" />
</property>
<property name="contactPhone">
<column name="contactPhone" length="32" not-null="false" />
</property>
<property name="contactAddress">
<column name="contactAddress" not-null="false" />
</property>
</class>
</hibernate-mapping>
I have clerly defined the getter ans setter in my User.java file .
But when I am running this code I am getting the error
Could not find a getter for password in class tecd.persistenc.entity.User
I don't know what I am missing plz help me out

You have declared getter and setter for password like this:
public String getUserPassword() {
return password;
}
public void setUserPassword(String password) {
this.password = password;
}
I think it should be like this (no "User" in it):
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
Those are the standard "bean"-style names for a password field.