Java Hibernate-无法连接到H2
我需要帮助。我不知道这个项目出了什么问题。我无法连接到h2数据库。即使我没有持久化任何对象,只是关闭了连接,也会出现错误 对不起,我知道,有人问了好几次,但没有一个答案符合我的情况 我得到的错误是: 2019年3月4日11:00:24 PM org.hibernate.Version日志版本信息: HH000412:Hibernate核心{5.2.12.最终版本}2019年3月4日11:00:24下午 org.hibernate.cfg.Environment信息:hh000206: hibernate.properties未找到2019年3月4日11:00:24 PM org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity警告:HH90000012:已识别的过时休眠 命名空间。 使用名称空间 相反对过时的DTD/XSD命名空间的支持可以在以下位置删除: 随时都可以。2019年3月4日11:00:24下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager 信息:HCANN000001:Hibernate Commons注释 {5.0.1.最终版本}2019年3月4日晚上11:00:25 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl 配置警告:HHH10001002:使用Hibernate内置连接池 (不用于生产!)org.hibernate.service.spi.ServiceException: 无法创建请求的服务 [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:271) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:233) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) 在 org.hibernate.engine.jdbc.internal.jdbcservicesiml.configure(jdbcservicesiml.java:51) 在 org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:242) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352) 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111) 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83) 在 org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418) 在 org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87) 在 org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:691) 在 org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726) 在 orm.hibernate.employees.HibernateUtils.(HibernateUtils.java:13) 在 orm.hibernate.employees.EmployeeRepository.addNewEmployee(EmployeeRepository.java:16) 位于orm.hibernate.EmployeesApp.main(EmployeesApp.java:21) 原因: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: 无法在加载类[org.h2.Driver] org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:348) 在 org.hibernate.engine.jdbc.connections.internal.DriverManager连接ProviderImpl.LoadDriverImple(DriverManager连接ProviderImpl.java:160) 在 org.hibernate.engine.jdbc.connections.internal.DriverManager连接ProviderImpl.buildCreator(DriverManager连接ProviderImpl.java:116) 在 org.hibernate.engine.jdbc.connections.internal.DriverManager连接ProviderImpl.buildPool(DriverManager连接ProviderImpl.java:100) 在 org.hibernate.engine.jdbc.connections.internal.DriverManager连接ProviderImpl.configure(DriverManager连接ProviderImpl.java:72) 在 org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:242) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) 在 org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator.buildJdbcConnectionAccess(jdbconvironmentinitiator.java:145) 在 org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator.initiateService(jdbconvironmentinitiator.java:66) 在 org.hibernate.engine.jdbc.env.internal.jdbconvironmentinitiator.initiateService(jdbconvironmentinitiator.java:35) 在 org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88) 在 org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:259) ... 16其他原因:java.lang.ClassNotFoundException:无法 加载请求的类:org.h2.Driver at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:336) 位于java.lang.ClassLoader.loadClass(ClassLoader.java:424) loadClass(ClassLoader.java:357)位于 java.lang.Class.forName0(本机方法)位于 java.lang.Class.forName(Class.java:348)位于 org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:345) ... 28多 #####初始SessionFactory创建失败。org.hibernate.service.spi.ServiceException:无法创建 请求的服务[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] 线程“main”java.lang.ExceptionInInitializeError中出现异常: 连接到数据库错误!在 orm.hibernate.employees.HibernateUtils.(HibernateUtils.java:17) 在 orm.hibernate.employeers.EmployeeRepository.addNewEmployee(EmployeeReposJava Hibernate-无法连接到H2,java,hibernate,orm,persistence,Java,Hibernate,Orm,Persistence,我需要帮助。我不知道这个项目出了什么问题。我无法连接到h2数据库。即使我没有持久化任何对象,只是关闭了连接,也会出现错误 对不起,我知道,有人问了好几次,但没有一个答案符合我的情况 我得到的错误是: 2019年3月4日11:00:24 PM org.hibernate.Version日志版本信息: HH000412:Hibernate核心{5.2.12.最终版本}2019年3月4日11:00:24下午 org.hibernate.cfg.Environment信息:hh000206: hiber
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>brudnopis.com</groupId>
<artifactId>brudnopis2</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.12.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.h2database/h2 -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.196</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
public class HibernateUtils {
private static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
} catch (Throwable ex) {
ex.printStackTrace();
System.err.println("########### Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError("Connection to database error!");
}
}
public static Session openSession() throws Exception {
Session session;
try {
session = sessionFactory.openSession();
} catch (Exception e) {
e.printStackTrace();
throw new Exception("Connection to database error!");
}
return session;
}
public static void closeSession(){
sessionFactory.close();
}
}
public class EmployeeRepository {
// Create
public static void addNewEmployee(EmployeeEntity employee){
Session session = null;
try {
session = HibernateUtils.openSession();
session.getTransaction().begin();
session.saveOrUpdate(employee);
session.getTransaction().commit();
}catch (Exception e){
e.printStackTrace();
}finally {
if (session != null && session.isOpen()) {
session.close();
}
}
}
// Read
public static List<EmployeeEntity> listAllEmployees(){
List<EmployeeEntity> listEmployees = new ArrayList<EmployeeEntity>();
Session session = null;
try {
session = HibernateUtils.openSession();
listEmployees = session.createQuery("SELECT e FROM EmployeeEntity e").getResultList();
} catch (Exception e) {
e.printStackTrace();
}finally {
if (session != null && session.isOpen()) {
session.close();
}
}
return listEmployees;
}
// Update
public static void editExistingEmployee(EmployeeEntity employee){
Session session = null;
try {
session = HibernateUtils.openSession();
session.getTransaction().begin();
session.merge(employee);
session.getTransaction().commit();
}catch (Exception e){
e.printStackTrace();
}finally{
if (session != null && session.isOpen()) {
session.close();
}
}
}
//Delete
public static void deleteEmployee(int idToDelete){
Session session = null;
try {
session = HibernateUtils.openSession();
EmployeeEntity employeeToDelete = session.find(EmployeeEntity.class, idToDelete);
session.getTransaction().begin();
session.remove(employeeToDelete);
session.getTransaction().commit();
}catch (Exception e){
e.printStackTrace();
}finally{
if (session != null && session.isOpen()) {
session.close();
}
}
}
}
@Entity
@Table(name = "employees")
public class EmployeeEntity {
@Id
@Column(name = "id")
private int id;
@Column(name = "employee_id")
private int employeeId;
@Column(name = "first_name")
private String firstName;
@Column(name = "last_name")
private String lastName;
public EmployeeEntity(int id, int employeeId, String firstName, String lastName) {
this.id = id;
this.employeeId = employeeId;
this.firstName = firstName;
this.lastName = lastName;
}
public EmployeeEntity(){}
@Override
public String toString() {
return "EmployeeEntity{" +
"id=" + id +
", employeeId=" + employeeId +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
'}';
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getEmployeeId() {
return employeeId;
}
public void setEmployeeId(int employeeId) {
this.employeeId = employeeId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
public class EmployeesApp {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
System.out.println("Menu");
System.out.println("====");
System.out.println("1. Write data to database");
System.out.println("2. Read data from database");
System.out.println("3. Exit");
int userChoice = sc.nextInt();
switch(userChoice){
case 1:
EmployeeEntity employee1 = new EmployeeEntity(1,10001,"Jon", "Doe");
EmployeeRepository.addNewEmployee(employee1);
System.out.println(EmployeeRepository.listAllEmployees());
case 3:
break;
}
HibernateUtils.closeSession();
}
}
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.196</version>
<scope>runtime</scope> <!-- Here you are saying this dependency is needed at runtime, not just at testing -->
</dependency>