Question

我已经测试了很长时间并且搜索了几个小时。既然有一些类似的问题，但经过尝试，它仍然无法正常工作，我使用spring MVC和jpa与hibernate建立一个基础项目，但问题是当我把它放入数据库时我无法将实体持久化到数据库中码头。奇怪的是，Junit测试通过了。

这是基本代码。

的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中

<?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);
    }

    // ...

}

PersonController.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"));
    }

}

有些xml之类的上下文和mvc config xml和import声明都省略了，servie和dao接口，有谁可以帮帮我？

Answer 1

Spring Junit不应该（并且默认情况下不会）持久存储到数据库中。

如果您希望数据在数据库中保留，请将此行添加到测试类中。

@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = false)

使用spring + jpa + hibernate但不能持久化实体并且永远不会抛出异常，测试通过

1 个答案: