我目前正尝试为Spring + JPA + Hibernate创建Spring最小示例。
我创建了以下类:
AppConfig.class
package test;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@Configuration
@ComponentScan(basePackageClasses = AppConfig.class)
@EnableJpaRepositories(basePackageClasses = Employee.class)
public class AppConfig {
}
AppMain.class
package test;
import java.util.List;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
public class AppMain {
public static void main(String args[]) {
AbstractApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
EmployeeRepository service = (EmployeeRepository) context.getBean("AccountRepository");
/*
* Create Employee1
*/
Employee employee1 = new Employee();
employee1.setName("name1");
/*
* Create Employee2
*/
Employee employee2 = new Employee();
employee2.setName("name2");
/*
* Persist both Employees
*/
service.save(employee1);
service.save(employee2);
List<Employee> emps = service.findAll();
for (Employee emp : emps) {
System.out.println(emp);
}
context.close();
}
}
Empoyee.class
package test;
import java.io.Serializable;
import java.util.Objects;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "EMPLOYEE")
public class Employee implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column(name = "NAME", nullable = false)
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Employee{" + "id=" + id + ", name=" + name + '}';
}
@Override
public int hashCode() {
int hash = 5;
hash = 19 * hash + this.id;
hash = 19 * hash + Objects.hashCode(this.name);
return hash;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Employee other = (Employee) obj;
if (this.id != other.id) {
return false;
}
if (!Objects.equals(this.name, other.name)) {
return false;
}
return true;
}
}
存储库
package test;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface EmployeeRepository extends JpaRepository<Employee, Long> {
Employee findOneByName(String name);
List<Employee> findAllByOrderByIdAsc();
}
HibernateCOnfig
package test;
import java.util.Properties;
import javax.sql.DataSource;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@EnableTransactionManagement
@PropertySource(value = {"classpath:application.properties"})
public class HibernateConfiguration {
@Autowired
private Environment environment;
@Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setPackagesToScan(new String[]{"test"});
sessionFactory.setHibernateProperties(hibernateProperties());
return sessionFactory;
}
@Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
return dataSource;
}
private Properties hibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
properties.put("hibernate.hbm2ddl.auto", "update");
return properties;
}
@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory s) {
HibernateTransactionManager txManager = new HibernateTransactionManager();
txManager.setSessionFactory(s);
return txManager;
}
}
application.properties
jdbc.driverClassName = org.h2.Driver
jdbc.url = jdbc:h2:./test
jdbc.username = myuser
jdbc.password = mypassword
hibernate.dialect = org.hibernate.dialect.H2Dialect
hibernate.show_sql = false
hibernate.format_sql = false
最后是pom.xml
<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>com.websystique.spring</groupId>
<artifactId>Spring4HibernateExample</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>Spring4HibernateExample</name>
<properties>
<springframework.version>4.0.6.RELEASE</springframework.version>
<hibernate.version>4.3.6.Final</hibernate.version>
<mysql.version>5.1.31</mysql.version>
<joda-time.version>2.3</joda-time.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.10.1.RELEASE</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.191</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.5.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
如果我尝试运行示例,我会得到: ...引起:java.lang.IllegalArgumentException:必须至少存在一个JPA元模型!
但我可以在目标文件夹中看到自动生成的元模型文件。我错过了什么?
答案 0 :(得分:2)
当我尝试通过spring-boot-starter-data-jpa 1.3.0.RELEASE使用带有spring boot的hibernate-entitymanager版本5.2.1.Final时,我看到相同的错误消息。
我也看到了在target / generated-sources / annotations中生成的MetaModel对象。
使用较旧的4.3.11.Final版本可以正常工作 - 没有错误。对我来说,它看起来像弹簧启动和休眠版本之间的版本不兼容,也许这是有帮助的。