7

我是Java新手。

我正在制作本教程（Spring MVC + Hibernate + Tomcat）

到目前为止一切都很好。当我尝试制作时，ApplicationController我无法自动装配ApplicationRepository。

404我在部署应用程序时收到此错误消息和错误代码：

Could not autowire. No beans of 'ApplicationRepository' type found. less...     
(Ctrl+F1) 
Checks autowiring problems in a bean class.

好的谈话很便宜。

这里是回购（github！）：https ://github.com/maciejkowalski/sample-spring-app

Tomcat堆栈跟踪：https : //gist.github.com/maciejkowalski/c7512d82feb75fcebd5f

这是代码：

根/src/main/java/wzpweb/

package wzpweb;

import javax.persistence.*;

@Entity(name = "applications")
public class Application {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Basic
    private String name;

    @Basic
    private String ip;

    @Basic
    private Boolean alive;

    @Basic
    private Integer port;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public Boolean getAlive() {
        return alive;
    }

    public void setAlive(Boolean alive) {
        this.alive = alive;
    }

    public Integer getPort() {
        return port;
    }

    public void setPort(Integer port) {
        this.port = port;
    }

}

package wzpweb;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class ApplicationController {

    @Autowired
    private ApplicationRepository applicationRepository;
    // THIS IS NOT WORKING !! ACHTUNG!

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String listApplications(ModelMap model) {
        model.addAttribute("application", new Application());
        model.addAttribute("applications", applicationRepository.findAll());
        return "users";
    }

}

package wzpweb;

import org.springframework.data.jpa.repository.JpaRepository;

public interface ApplicationRepository extends JpaRepository<Application, Long> {
}

根/src/main/webapp/WEB-INF/mvc-dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa" 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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:component-scan base-package="wzpweb"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <jpa:repositories base-package="wzpweb"/>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="defaultPersistenceUnit"/>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

根/src/main/webapp/WEB-INF/web.xml

<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Spring MVC Application</display-name>

    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

根/src/main/resources/META-INF/persistance.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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">
    <persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost/sample"/>
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
            <property name="hibernate.connection.username" value="postgres" />
            <property name="hibernate.connection.password" value="123" />
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
        </properties>
    </persistence-unit>
</persistence>

根/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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.springapp</groupId>
    <artifactId>WZP_aplikacja_web</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>WZP_aplikacja_web</name>

    <properties>
        <spring.version>3.2.2.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>3.0</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.0-api</artifactId>
            <version>1.0.1.Final</version>
        </dependency>


        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.2.0.Final</version>
        </dependency>


        <dependency>
            <groupId>postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.1-901.jdbc4</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>WZP_aplikacja_web</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <includes>
                        <include>**/*Tests.java</include>
                    </includes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

编辑#1

我已经编辑web.xml并添加了代码：

<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Spring MVC Application</display-name>

    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

但现在我 Element listener-class is not allowed her从 Intellij IDEA 获得。

我的应用程序甚至没有部署。

编辑#2

那么问题仍然存在。

我重命名persistance.xml为persistence.xml.

重新启动 Intellij idea 并仍然收到此错误。

也许这是一个错误？

我可能会放弃这个春天的东西，它超出了我的范围......

4

5 回答 5

14

我遵循相同的教程并遇到相同的代码检查警告（即使应用程序运行良好，IDE 也会抱怨）。为了修复它，我添加@Repository到我的 JpaRepository：

对于您的示例：

package wzpweb;

import org.springframework.data.jpa.repository.JpaRepository;

@Repository
public interface ApplicationRepository extends JpaRepository<Application, Long> {
}
于 2015-01-10T18:37:38.643 回答
2

将您的文件重命名persistance.xml为persistence.xml. persistence.xml默认情况下，它是目录中定义 entityManagerFactory 所需的持久性单元所需的文件的名称META-INF/。

这是一篇博客文章，解释了 Spring 如何使用您的自定义接口实现JpaRepository来生成实现类。我原本以为你需要一个实现类，但事实并非如此。

命名中的小错误是您的问题，由堆栈跟踪中的第一个异常给出。

javax.persistence.PersistenceException: No Persistence provider for EntityManager named defaultPersistenceUnit
于 2013-04-26T17:47:30.983 回答
1

将上下文加载器侦听器添加到 web.xml 以在启动时读取 Spring 应用程序上下文 XML。

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/context/applicationContext.xml,/WEB-INF/context/applicationContext-*.xml</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
于 2013-04-26T17:25:13.290 回答
1

当您创建ObjectService并在RestController中实例化它并且您没有使用@Service注释ObjectServiceImpl时，会出现类似的问题。

于 2019-02-08T11:18:40.190 回答
1

去掉Spring facet (File->Project Structure) 在相关模块配置内容的facet中杀掉项目配置，IDEA自动识别。删除后，相关错误消失。不影响编译。

于 2017-09-21T12:25:22.150 回答