我已经测试了很长时间并搜索了几个小时。由于有一些类似的问题，但尝试后仍然无法正常工作，我正在使用spring MVC和jpa和hibernate来建立一个基础项目，但问题是当我将实体放入数据库时我无法将它保存到数据库中码头。奇怪的是，Junit 测试通过了。
这是基本代码。
web.xml
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Processes application requests -->
<servlet>
<servlet-name>controller</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/controller.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>controller</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
db-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<!-- DBCP DataSource -->
<bean class="org.apache.commons.dbcp.BasicDataSource" id="dataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost/spring" />
<property name="username" value="root" />
<property name="password" value="root" />
</bean>
<!-- JPA EntityManagerFactory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="jpaVendorAdapter">
<bean id="jpaVendorAdapter"
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" />
<property name="generateDdl" value="true" />
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
</bean>
</property>
<property name="dataSource" ref="dataSource" />
</bean>
<!-- Persistence Context Annotated -->
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"
id="persistenceAnnotationBeanPostProcessor" />
<!-- Transaction -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
persistence.xml（在 META-INF 文件夹中）
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="persist" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.transaction.flush_before_completion"
value="true" />
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider" />
</properties>
</persistence-unit>
</persistence>
Person.java（实体 bean）
@Entity
public class Person {
private int id;
private String name;
@Id
@GeneratedValue
public int getId() {
return id;
}
// ..
}
PersonDaoImpl.java
@Repository
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class PersonDaoImpl implements PersonDao {
private EntityManager entityManager;
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public Person persist(Person person) {
entityManager.persist(person);
return person;
}
// ...
}
PersonServiceImpl.java
@Service
public class PersonServiceImpl implements PersonService {
private PersonDao personDao;
@Inject
public void setPersonDao(PersonDao personDao) {
this.personDao = personDao;
}
public Person create(Person person) {
return personDao.persist(person);
}
// @Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public Person save(Person person) {
return personDao.merge(person);
}
// ...
}
人控制器.java
@Controller
@Scope("prototype")
@RequestMapping("/person")
public class PersonController {
private PersonService personService;
@Inject
public void setPersonService(PersonService personService) {
this.personService = personService;
}
@RequestMapping(value = "/add", method = RequestMethod.POST)
public ModelAndView add(@RequestParam("username") String name) {
Person person = new Person();
person.setName(name);
System.out.println(name); // i can get the value
personService.create(person); // nothing happend... throws no Excp
ModelAndView mav = new ModelAndView();
mav.setViewName("result");
mav.addObject("val", person.getName());
return mav;
}
}
PersonControllerTest.java
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/test-context.xml")
public class PersonControllerTest {
private PersonController controller;
@Inject
public void setController(PersonController controller) {
this.controller = controller;
}
// the test passed no matter @Transactional or not, if not, the db get the row
@Test(/*expected = NullPointerException.class*/)
@Transactional
public void testAdd() {
// PersonController controller = new PersonController();
assertEquals("test", controller.add("test").getModelMap().get("val"));
}
}
省略了一些 xml，如 context 和 mvc config xml 和 import 声明，servie 和 dao 接口，有人可以帮我吗？