找不到PostgreSQL的JDBC驱动程序

Question

我正在为应用程序使用spring，hibernate，postgresql和maven，但是在构建它时出现此错误：

在com.rovb.webstore.config.RootApplicationContextConfig中定义名称为“ dataSource”的bean创建错误：通过工厂方法实例化Bean失败；嵌套的异常是org.springframework.beans.BeanInstantiationException：无法实例化[javax.sql.DataSource]：工厂方法'dataSource'引发了异常；嵌套异常是java.lang.IllegalStateException：找不到必需的键'org.postgresql.Driver'

我正在使用STS 4.0，我的代码是：

DispatcherServletInitializer.java

package com.rovb.webstore.config;

import  org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

 @Override
 protected Class<?>[] getRootConfigClasses() {
     return new Class[] { RootApplicationContextConfig.class };
     //return null;
}

 @Override
 protected Class<?>[] getServletConfigClasses() {
      return new Class[] { WebApplicationContextConfig.class };
 }

 @Override
 protected String[] getServletMappings() {
       return new String[] { "/"};
 }
}

RootApplicationContextConfig.java

package com.rovb.webstore.config;

import java.util.Properties;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@ComponentScan({ "com.rovb.webstore.config" })
public class RootApplicationContextConfig {

@Autowired
private Environment environment;

@Bean
public LocalSessionFactoryBean sessionFactory() {
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(dataSource());
    sessionFactory.setPackagesToScan(new String[] { "com.rovb.webstore.model" });
    sessionFactory.setHibernateProperties(hibernateProperties());
    return sessionFactory;
}

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName(environment.getRequiredProperty("org.postgresql.Driver"));
    dataSource.setUrl(environment.getRequiredProperty("jdbc:postgresql://localhost:5432/tetra"));
    dataSource.setUsername(environment.getRequiredProperty("postgres"));
    dataSource.setPassword(environment.getRequiredProperty("postgres"));
    return dataSource;
}

private Properties hibernateProperties() {
    Properties properties = new Properties();
    properties.put("hibernate.dialect", environment.getRequiredProperty("org.hibernate.dialect.PostgreSQLDialect"));
    properties.put("hibernate.show_sql", environment.getRequiredProperty("true"));
    properties.put("hibernate.format_sql", environment.getRequiredProperty("true"));
    properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
    return properties;
}

@Bean
public HibernateTransactionManager getTransactionManager() {
    HibernateTransactionManager transactionManager = new HibernateTransactionManager();
    transactionManager.setSessionFactory(sessionFactory().getObject());
    return transactionManager;
}
}

WebApplicationContextConfig.java

package com.rovb.webstore.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan("com.rovb.webstore")
public class WebApplicationContextConfig extends WebMvcConfigurerAdapter {

 @Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
}

@Bean
public InternalResourceViewResolver getInternalResourceViewResolver() {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setViewClass(JstlView.class);
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".jsp");

    return resolver;
}
}

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.packt</groupId>
<artifactId>webstore</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<springframework.version>4.3.0.RELEASE</springframework.version>
<servlets.version>3.1.0</servlets.version>
<jstl.version>1.2</jstl.version>
<hibernate.version>5.1.0.Final</hibernate.version>
</properties>

<dependencies>
    <!-- SPRING -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${springframework.version}</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${springframework.version}</version>
        <scope>compile</scope>
    </dependency>

    <!-- JAVA -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>${servlets.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>${jstl.version}</version>
    </dependency>

    <!-- HIBERNATE -->      
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate.version}</version>
        <scope>compile</scope>
    </dependency>   

    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.4-1205-jdbc42</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.6</version>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
    </plugins>
</build>