java - 在 Spring MVC 中使用@Controller、@Service 和@Inject

Question

我有一个工作 Controller ，它有一项服务，如下所示。

@Controller
public class FileController 
{
   private FileService   fileService;       // service injected by Spring

   /**
    * constructor which initializes the file service.
    * @param fileService     service used to retrieve a list of files
    */
   @Inject
   public FileController(FileService fileService)
   {
      this.fileService = fileService;
   }

   ...
}

同样，我有另一个服务，我也在另一个 Controller 中工作和使用它。

@Controller
public class SearchController 
{
   private SearchService searchService;       // service injected by  Spring

   /**
    * constructor which initializes the search service.
    * @param searchService     service used to search for items
    */
   @Inject
   public SearchController(SearchService searchService)
   {
      this.searchService = searchService;
   }

   ...
}

服务和 Controller 都工作正常。

然后，在开发过程中，发现 FileController 也需要搜索服务，所以我修改了 FileController 如下所示。

@Controller
public class FilesController
{
   // data members
   private FileService   fileService;       // service injected by Spring
   private SearchService searchService;     // service injected by Spring

   /**
    * constructor which initializes the file service.
    * @param fileService     service used to retrieve a list of files
    * @param searchService   service used to retrieve a list of items.
    */
   @Inject
   public FilesController(FileService fileService, SearchService searchService)
   {
      this.fileService   = fileService;
      this.searchService = searchService;
   }
   ...
}

编译和部署都很好，但是当我访问使用 FileController 的 View 时，它会因 Spring 错误而爆炸:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0': Initialization of bean failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'filesController' defined in file [C:\rw_apps\tomcat\6.0.43-2\webapps\webquery\WEB-INF\classes\com\rockwell_collins\webquery\controller\FilesController.class]: Unsatisfied dependency expressed through constructor argument with index 1 of type [com.rockwell_collins.webquery.service.SearchService]: : Error creating bean with name 'searchService' defined in file [C:\rw_apps\tomcat\6.0.43-2\webapps\webquery\WEB-INF\classes\com\rockwell_collins\webquery\service\SearchService.class]: Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'searchService' defined in file [C:\rw_apps\tomcat\6.0.43-2\webapps\webquery\WEB-INF\classes\com\rockwell_collins\webquery\service\SearchService.class]: Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError

Spring 只能将一项服务注入(inject)到 Controller 中吗？我已经尝试在我的 spring xml 文件中指定“default-autowire”并尝试了所有可能的值，但没有任何效果。

Answer 1

您的 SearchService 是什么样子的？那里有一些静态 block 吗？

ExceptionInInitializerError '表示在静态初始化程序中发生了意外异常'