Question

我目前正在从事Spring Security项目：具有注册和登录功能的Web应用程序。

下面稍后将提供的代码来自Udemy课程，而我只是在学习它。

代码对我来说似乎是正确的，但它会引发这样的异常。

(root cause)
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'demoSecurityConfig': Unsatisfied dependency 
expressed through field 'userService'; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'userServiceImpl': Unsatisfied dependency expressed 
through field 'userDao'; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'userDaoImpl': Unsatisfied dependency expressed 
through field 'sessionFactory'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating 
bean with name 'sessionFactory' defined in 
com.luv2code.springsecurity.demo.config.DemoAppConfig: Invocation of init 
method failed; nested exception is java.lang.IllegalArgumentException: 
Class name must not be null

如果您查看抛出的异常，它会不停地出现多个嵌套异常，直到到达DemoAppConfig.class，所以@Autowired批注对我来说工作正常。

对我来说，此异常的根本问题似乎是由此引起的。

java.lang.IllegalArgumentException: Class name must not be null

但是，我找不到解决此问题的解决方案。我发现有一篇有关此问题的文章写于2013年。它说我需要导入这些依赖项

<dependencies>
  <!-- ... other dependency elements ... -->
  <dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>
    <version>3.2.0.CI-SNAPSHOT</version>
  </dependency>
  <dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-config</artifactId>
    <version>3.2.0.CI-SNAPSHOT</version>
  </dependency>
</dependencies>

<repositories>
  <!-- ... possibly other repository elements ... -->
  <repository>
    <id>spring-snapshots</id>
    <url>https://repo.springsource.org/snapshot</url>
  </repository>
</repositories>

但是，它不起作用。

看来问题的主要原因是在DemoAppConfig.class中，所以我只会复制和粘贴有线类源代码的一部分，这足以向您展示它们如何相互连接，除了DemoAppConfig.class。

这是代码。

DemoSecurityConfig.class

@Configuration
@EnableWebSecurity
public class DemoSecurityConfig extends WebSecurityConfigurerAdapter {

    //UserService는 UserDetailsService를 extends하는 interface이다.
    @Autowired
    private UserService userService;

UserService.class

public interface UserService extends UserDetailsService{

    User findByUserName(String userName);

    void save(CrmUser crmUser);
}

UserServiceImpl.class

@Service
    public class UserServiceImpl implements UserService{

        @Autowired
        private UserDao userDao;
        @Autowired
        private BCryptPasswordEncoder passwordEncoder;

UserDao.class

public interface UserDao {
    User findByUserName(String userName);

    void save(User user);
}

UserDaoImpl.class

@Repository
public class UserDaoImpl implements UserDao {

    // need to inject the session factory
    @Autowired
    private SessionFactory sessionFactory;

DemoAppConfig.class

@Configuration
@EnableWebMvc
@ComponentScan(basePackages="com.luv2code.springsecurity.demo")
@PropertySource("classpath:persistence-oracle.properties")
public class DemoAppConfig {

    @Autowired
    private Environment env;

    private Logger logger = Logger.getLogger(getClass().getName());

    // define a bean for ViewResolver

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

        viewResolver.setPrefix("/WEB-INF/view/");
        viewResolver.setSuffix(".jsp");

        return viewResolver;
    }

    @Bean
    public DataSource securityDataSource() {

        ComboPooledDataSource securityDataSource
            = new ComboPooledDataSource();

        try {
            securityDataSource.setDriverClass(env.getProperty("jdbc.driver"));
        } catch (PropertyVetoException e) {
            // TODO Auto-generated catch block
            throw new RuntimeException(e);
        }

        logger.info(">>> jdbc.url=" + env.getProperty("jdbc.url"));
        logger.info(">>> jdbc.user=" + env.getProperty("jdbc.user"));

        securityDataSource.setJdbcUrl(env.getProperty("jdbc.url"));
        securityDataSource.setUser(env.getProperty("jdbc.user"));
        securityDataSource.setPassword(env.getProperty("jdbc.password"));

        securityDataSource.setInitialPoolSize(getIntProperty("connection.pool.initialPoolSize"));
        securityDataSource.setMinPoolSize(getIntProperty("connection.pool.minPoolSize"));
        securityDataSource.setMaxPoolSize(getIntProperty("connection.pool.maxPoolSize"));
        securityDataSource.setMaxIdleTime(getIntProperty("connection.pool.maxIdleTime"));

        return securityDataSource;
    }

    private int getIntProperty(String propName) {
        String propVal = env.getProperty(propName);

        int intPropVal = Integer.parseInt(propVal);

        return intPropVal;
    }

    private Properties getHibernateProperties() {

        // set hibernate properties
        Properties props = new Properties();

        props.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
        props.setProperty("hibernate.show_sql", env.getProperty("hibernate.show_sql"));

        return props;               
    }


    @Bean
    public LocalSessionFactoryBean sessionFactory(){

        // create session factories
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();

        // set the properties
        sessionFactory.setDataSource(securityDataSource());
        sessionFactory.setPackagesToScan(env.getProperty("hiberante.packagesToScan"));
        sessionFactory.setHibernateProperties(getHibernateProperties());

        return sessionFactory;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) {

        // setup transaction manager based on session factory
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(sessionFactory);

        return txManager;
    }   


}

如果您需要更多信息，请告诉我，谢谢您的支持。

春季错误：嵌套的异常是java.lang.IllegalArgumentException：类名称不能为null

0 个答案: