It work in another example but this one it not.I'm copy code and edit line from line but it keep showing the error.i dont know what wrong with the QLKH_DTO class Im using netbean 15 and hibernate 6. The entity class `
package DTO;
import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.Table;
@Entity
@Table(name = "customers", catalog = "market")
public class QLKH_DTO implements java.io.Serializable {
private Integer CustomerID;
private String Password;
private String Fullname;
private String Address;
private String City;
public QLKH_DTO(){}
public QLKH_DTO(String Password,String Fullname, String Address, String City) {
this.Password = Password;
this.Fullname = Fullname;
this.Address = Address;
this.City = City;
}
@Id
@GeneratedValue(strategy =GenerationType.IDENTITY)
@Column(name = "CustomerID")
public Integer getCustomerID() {
return CustomerID;
}
public void setCustomerID(Integer CustomerID) {
this.CustomerID = CustomerID;
}
@Column(name = "Password")
public String getPassword() {
return Password;
}
public void setPassword(String PassWord) {
this.Password = PassWord;
}
@Column(name = "Fullname")
public String getFullname() {
return Fullname;
}
public void setFullname(String FullName) {
this.Fullname = FullName;
}
@Column(name = "Address", length = 20)
public String getAddress() {
return Address;
}
public void setAddress(String Address) {
this.Address = Address;
}
@Column(name = "City", length = 20)
public String getCity() {
return City;
}
public void setCity(String City) {
this.City = City;
}
}
The test class
package GUI.QLKH;
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import DTO.QLKH_DTO;
import utils.HibernateUtil;
public class QLKH {
private static SessionFactory factory;
public static void main(String[] args) {
// get session factory
factory = HibernateUtil.getSessionFactory();
// create manageEmployee object
QLKH Customer = new QLKH();
System.out.println("List down all the customers:");
Customer.listCustomers();
}
public void listCustomers() {
Session session = factory.openSession();
try {
List customers = session.createQuery("FROM customers").list();
for (Iterator iterator = customers.iterator(); iterator.hasNext();) {
QLKH_DTO customer = (QLKH_DTO) iterator.next();
System.out.print("ID " customer.getCustomerID());
System.out.print("Password " customer.getPassword());
System.out.print("Fullname " customer.getFullname());
System.out.println("Address " customer.getAddress());
System.out.println("City " customer.getCity());
}
} catch (HibernateException e) {
} finally {
session.close();
}
}}
`
The HibernateUtill Class `
package utils;
import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.service.ServiceRegistry;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
public static SessionFactory buildSessionFactory() {
try {
ServiceRegistry serviceRegistry;
serviceRegistry = new StandardServiceRegistryBuilder()
.configure()
.build();
Metadata metadata = new MetadataSources(serviceRegistry)
.getMetadataBuilder().build();
return metadata.getSessionFactoryBuilder().build();
} catch (Throwable ex) {
}
return sessionFactory;
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
The hibernate.cfg.xml
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name = "hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name = "hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<!-- Assume students is the database name -->
<property name = "hibernate.connection.url">
jdbc:mysql://localhost:3306/market
</property>
<property name = "hibernate.connection.username">
root
</property>
<property name = "hibernate.connection.password">
</property>
<mapping />
</session-factory>
</hibernate-configuration>
The sql
CREATE TABLE `Customers` (
`CustomerID` int(10) NOT NULL auto_increment,
`Password` varchar(20) NOT NULL,
`Fullname` varchar(40) NOT NULL,
`Address` varchar(50) DEFAULT NULL,
`City` varchar(20) DEFAULT NULL,
PRIMARY KEY (CustomerID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `Customers`
--
INSERT INTO `Customers` (`CustomerID`, `Password`, `Fullname`, `Address`, `City`) VALUES
(1, 'Abcd1234', 'John Smith', '30 Broadway', 'London'),
(2, 'Abcd1234', 'Jonny English', '99 River View', 'Reading'),
(3, 'Abcd1234', 'Elizabeth', '23 Buckinghamshire', 'York'),
(4, 'Abcd1234', 'Beatrix', '66 Royal Crescent', 'Bath');
The Error log
Nov 21, 2022 9:27:01 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate ORM core version 6.1.5.Final
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using built-in connection pool (not intended for production use)
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: Loaded JDBC driver class: com.mysql.jdbc.Driver
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001012: Connecting with JDBC URL [jdbc:mysql://localhost:3306/market]
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {password=****, user=root}
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Nov 21, 2022 9:27:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PooledConnections <init>
INFO: HHH10001115: Connection pool size: 20 (min=1)
Nov 21, 2022 9:27:09 PM org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl logSelectedDialect
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Nov 21, 2022 9:27:13 PM org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator initiateService
INFO: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
List down all the customers:
Exception in thread "main" java.lang.IllegalArgumentException: org.hibernate.query.sqm.UnknownEntityException: Could not resolve root entity 'customers'
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:175)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:182)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:761)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:663)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:127)
at GUI.QLKH.QLKH.listCustomers(QLKH.java:32)
at GUI.QLKH.QLKH.main(QLKH.java:27)
Caused by: org.hibernate.query.sqm.UnknownEntityException: Could not resolve root entity 'customers'
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitRootEntity(SemanticQueryBuilder.java:1628)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitRootEntity(SemanticQueryBuilder.java:243)
at org.hibernate.grammars.hql.HqlParser$RootEntityContext.accept(HqlParser.java:1873)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitEntityWithJoins(SemanticQueryBuilder.java:1548)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitFromClause(SemanticQueryBuilder.java:1539)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitQuery(SemanticQueryBuilder.java:833)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitQuerySpecExpression(SemanticQueryBuilder.java:629)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitQuerySpecExpression(SemanticQueryBuilder.java:243)
at org.hibernate.grammars.hql.HqlParser$QuerySpecExpressionContext.accept(HqlParser.java:1218)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitSimpleQueryGroup(SemanticQueryBuilder.java:623)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitSimpleQueryGroup(SemanticQueryBuilder.java:243)
at org.hibernate.grammars.hql.HqlParser$SimpleQueryGroupContext.accept(HqlParser.java:1131)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitSelectStatement(SemanticQueryBuilder.java:399)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.visitStatement(SemanticQueryBuilder.java:358)
at org.hibernate.query.hql.internal.SemanticQueryBuilder.buildSemanticModel(SemanticQueryBuilder.java:285)
at org.hibernate.query.hql.internal.StandardHqlTranslator.translate(StandardHqlTranslator.java:81)
at org.hibernate.internal.AbstractSharedSessionContract.lambda$createQuery$2(AbstractSharedSessionContract.java:748)
at org.hibernate.query.internal.QueryInterpretationCacheStandardImpl.createHqlInterpretation(QueryInterpretationCacheStandardImpl.java:141)
at org.hibernate.query.internal.QueryInterpretationCacheStandardImpl.resolveHqlInterpretation(QueryInterpretationCacheStandardImpl.java:128)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:745)
... 4 more
Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404)
at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:982)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:929)
at org.codehaus.mojo.exec.ExecMojo.execute (ExecMojo.java:457)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:370)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:171)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:163)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:564)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
` It look like the problem mostly in the entity class but i don't know where Anyhelp would be appreciate
CodePudding user response：
XtremeBauumer answered it in the comments:
session.createQuery("FROM customers") your entity is not called customers it is called QLKH_DTO
Hibernate doesn't care about what its called in the database. It cares about your code