org.springframework.web.servlet.DispatcherServlet.initServletBean 上下文初始化失败

Question

I use this tutorial for Spring MVC example, but I use PostgreSQL.

And I have a lot of exceptions, I have searched but nothing helped.

This is Exception:

    SEVERE [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.DispatcherServlet.initServletBean Context initialization failed
 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private net.codejava.spring.dao.ContactDAO net.codejava.spring.controller.HomeController.contactDAO; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getContactDAO' defined in class path resource [net/codejava/spring/config/MvcConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public net.codejava.spring.dao.ContactDAO net.codejava.spring.config.MvcConfiguration.getContactDAO()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getDataSource' defined in class path resource [net/codejava/spring/config/MvcConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public javax.sql.DataSource net.codejava.spring.config.MvcConfiguration.getDataSource()] threw exception; nested exception is java.lang.IllegalStateException: Could not load JDBC driver class [org.postgresql.Driver]

If I understand right I have a problem with load JDBC Driver, but I already added this in pom.xml

My source code:

MvcConfiguration :

package net.codejava.spring.config;

import javax.sql.DataSource;

import net.codejava.spring.dao.ContactDAO;
import net.codejava.spring.dao.ContactDAOImpl;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@ComponentScan(basePackages="net.codejava.spring")
@EnableWebMvc
public class MvcConfiguration extends WebMvcConfigurerAdapter{

    @Bean
    public ViewResolver getViewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
    }

    @Bean
    public DataSource getDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://localhost:5432/contactdb");
        dataSource.setUsername("postgres");
        dataSource.setPassword("3517571");

        return dataSource;
    }

    @Bean
    public ContactDAO getContactDAO() {
        return new ContactDAOImpl(getDataSource());
    }
}

HomeController:

package net.codejava.spring.controller;

import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import net.codejava.spring.dao.ContactDAO;
import net.codejava.spring.model.Contact;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

/**
 * This controller routes accesses to the application to the appropriate
 * hanlder methods. 
 * @author www.codejava.net
 *
 */
@Controller
public class HomeController {

    @Autowired
    private ContactDAO contactDAO;

    @RequestMapping(value="/")
    public ModelAndView listContact(ModelAndView model) throws IOException{
        List<Contact> listContact = contactDAO.list();
        model.addObject("listContact", listContact);
        model.setViewName("home");

        return model;
    }

    @RequestMapping(value = "/newContact", method = RequestMethod.GET)
    public ModelAndView newContact(ModelAndView model) {
        Contact newContact = new Contact();
        model.addObject("contact", newContact);
        model.setViewName("ContactForm");
        return model;
    }

    @RequestMapping(value = "/saveContact", method = RequestMethod.POST)
    public ModelAndView saveContact(@ModelAttribute Contact contact) {
        contactDAO.saveOrUpdate(contact);       
        return new ModelAndView("redirect:/");
    }

    @RequestMapping(value = "/deleteContact", method = RequestMethod.GET)
    public ModelAndView deleteContact(HttpServletRequest request) {
        int contactId = Integer.parseInt(request.getParameter("id"));
        contactDAO.delete(contactId);
        return new ModelAndView("redirect:/");
    }

    @RequestMapping(value = "/editContact", method = RequestMethod.GET)
    public ModelAndView editContact(HttpServletRequest request) {
        int contactId = Integer.parseInt(request.getParameter("id"));
        Contact contact = contactDAO.get(contactId);
        ModelAndView model = new ModelAndView("ContactForm");
        model.addObject("contact", contact);

        return model;
    }
}

ContactDAO:

package net.codejava.spring.dao;

import java.util.List;

import net.codejava.spring.model.Contact;

/**
 * Defines DAO operations for the contact model.
 * @author www.codejava.net
 *
 */
public interface ContactDAO {

    public void saveOrUpdate(Contact contact);

    public void delete(int contactId);

    public Contact get(int contactId);

    public List<Contact> list();
}

ContactDAOImpl:

package net.codejava.spring.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.sql.DataSource;

import net.codejava.spring.model.Contact;

import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowMapper;

/**
 * An implementation of the ContactDAO interface.
 * @author www.codejava.net
 *
 */

public class ContactDAOImpl implements ContactDAO {

    private JdbcTemplate jdbcTemplate;

    public ContactDAOImpl(DataSource dataSource) {
        jdbcTemplate = new JdbcTemplate(dataSource);
    }

    @Override
    public void saveOrUpdate(Contact contact) {
        if (contact.getId() > 0) {
            // update
            String sql = "UPDATE contact SET name=?, email=?, address=?, "
                        + "telephone=? WHERE contact_id=?";
            jdbcTemplate.update(sql, contact.getName(), contact.getEmail(),
                    contact.getAddress(), contact.getTelephone(), contact.getId());
        } else {
            // insert
            String sql = "INSERT INTO contact (name, email, address, telephone)"
                        + " VALUES (?, ?, ?, ?)";
            jdbcTemplate.update(sql, contact.getName(), contact.getEmail(),
                    contact.getAddress(), contact.getTelephone());
        }

    }

    @Override
    public void delete(int contactId) {
        String sql = "DELETE FROM contact WHERE contact_id=?";
        jdbcTemplate.update(sql, contactId);
    }

    @Override
    public List<Contact> list() {
        String sql = "SELECT * FROM contact";
        List<Contact> listContact = jdbcTemplate.query(sql, new RowMapper<Contact>() {

            @Override
            public Contact mapRow(ResultSet rs, int rowNum) throws SQLException {
                Contact aContact = new Contact();

                aContact.setId(rs.getInt("contact_id"));
                aContact.setName(rs.getString("name"));
                aContact.setEmail(rs.getString("email"));
                aContact.setAddress(rs.getString("address"));
                aContact.setTelephone(rs.getString("telephone"));

                return aContact;
            }

        });

        return listContact;
    }

    @Override
    public Contact get(int contactId) {
        String sql = "SELECT * FROM contact WHERE contact_id=" + contactId;
        return jdbcTemplate.query(sql, new ResultSetExtractor<Contact>() {

            @Override
            public Contact extractData(ResultSet rs) throws SQLException,
                    DataAccessException {
                if (rs.next()) {
                    Contact contact = new Contact();
                    contact.setId(rs.getInt("contact_id"));
                    contact.setName(rs.getString("name"));
                    contact.setEmail(rs.getString("email"));
                    contact.setAddress(rs.getString("address"));
                    contact.setTelephone(rs.getString("telephone"));
                    return contact;
                }

                return null;
            }

        });
    }

}

pom.xml:

<?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>net.codejava.spring</groupId>
    <artifactId>SpringMvcJdbcTemplate</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>

    <name>SpringMvcJdbcTemplate</name>
    <url>http://maven.apache.org</url>

    <properties>
        <java.version>1.8</java.version>
        <spring.version>4.0.3.RELEASE</spring.version>
        <cglib.version>2.2.2</cglib.version>
    </properties>

    <dependencies>



        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.3-1102-jdbc41</version>
        </dependency>

        <!-- Spring core & mvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>

        <!-- CGLib for @Configuration -->
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>${cglib.version}</version>
            <scope>runtime</scope>
        </dependency>


        <!-- Servlet Spec -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.1</version>
            <scope>provided</scope>
        </dependency>

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




    </dependencies>

    <build>
        <finalName>SpringMvcJdbcTemplate</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.0.2</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Answer 1

I have fixed the same error in intellij idea by switching from jdk-16 to jdk-13 in my pom.xml and in my project sdk (File --> project structure --> project --> jdk-13). Further more i was using servlet api instead of web.xml

Answer 2

尝试更新您的项目，下载所有库，然后您将看到 postgresql 驱动程序的绝对路径。