0

我在使 Autowired 注释正常工作时遇到了一些麻烦。看到这两个类：

@Component("upAuthenticationProvider")
public class UPAuthenticationProvider implements AuthenticationProvider {

    @Autowired
    private AuthenticationDAO authenticationDAO;

    // snip

    public AuthenticationDAO getAuthenticationDAO() {
    return authenticationDAO;
    }

    public void setAuthenticationDAO(
          AuthenticationDAO authenticationDAO) {
    this.authenticationDAO = authenticationDAO;
    }
}

和依赖：

@Repository
public class AuthenticationPostgresDAO implements AuthenticationDAO{

    @Autowired
    private DataSource dataSource;

    // snip...
}

当应用程序初始化时，我在日志中看到了这一点：

08:09:41.268 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating shared instance of singleton bean 'upAuthenticationProvider'
08:09:41.268 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'upAuthenticationProvider'
08:09:41.269 [pool-2-thread-1] DEBUG o.s.b.f.annotation.InjectionMetadata - Found injected element on class [com.mycompany.authentication.UPAuthenticationProvider]: AutowiredFieldElement for private com.mycompany.dao.AuthenticationDAO com.mycompany.authentication.UPAuthenticationProvider.AuthenticationDAO
08:09:41.269 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'upAuthenticationProvider' to allow for resolving potential circular references
08:09:41.271 [pool-2-thread-1] DEBUG o.s.b.f.annotation.InjectionMetadata - Processing injected method of bean 'upAuthenticationProvider': AutowiredFieldElement for private com.mycompany.dao.AuthenticationDAO com.mycompnay.authentication.UPAuthenticationProvider.AuthenticationDAO
08:09:41.273 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating shared instance of singleton bean 'AuthenticationPostgresDAO'
08:09:41.273 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'AuthenticationPostgresDAO'
08:09:41.273 [pool-2-thread-1] DEBUG o.s.b.f.annotation.InjectionMetadata - Found injected element on class [com.mycompnay.dao.AuthenticationPostgresDAO]: AutowiredFieldElement for private javax.sql.DataSource com.mycompany.dao.AuthenticationPostgresDAO.dataSource
08:09:41.273 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'authenticationPostgresDAO' to allow for resolving potential circular references
08:09:41.273 [pool-2-thread-1] DEBUG o.s.b.f.annotation.InjectionMetadata - Processing injected method of bean 'authenticationPostgresDAO': AutowiredFieldElement for private javax.sql.DataSource com.mycompnay.dao.AuthenticationPostgresDAO.dataSource
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'dataSource'
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.a.AutowiredAnnotationBeanPostProcessor - Autowiring by type from bean name 'AuthenticationPostgresDAO' to bean named 'dataSource'
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'authenticationPostgresDAO'
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.a.AutowiredAnnotationBeanPostProcessor - Autowiring by type from bean name 'upAuthenticationProvider' to bean named 'authenticationPostgresDAO'
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'upAuthenticationProvider'
08:09:41.274 [pool-2-thread-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'authenticationPostgresDAO'

看起来它告诉我它创建了依赖项并将其连接起来，但是在我的应用程序中，当我尝试从 upAuthenticationProvider 访问 authenticationPostgresDAO 时，我得到了一个 NPE

4

1 回答 1

0

所以问题显然不在于您向我们展示的代码... 1）您如何访问您的 upAuthenticationProvider 实例，您应该从 Spring ApplicationContext 中获取它。2) 抛出 NPE 的代码是什么？除了 DAO 之外的其他东西可以在抛出异常的行上为 null 吗？

于 2012-05-25T12:41:26.720 回答