我試圖在MVC控制器類中自動佈線一個bean,但是我無法獲得比null更多的值。當我將throw new Error("E")
放入要注入到helloWorldController
bean的bean的構造函數中時,我得到一個異常:創建名爲helloWorldController的bean時出錯:注入自動裝配依賴失敗。但是,當我運行測試沒有錯誤在構造函數中,我沒有得到該bean,我得到空。MVC控制器中的自動佈線bean爲空
我完全困惑。它有什麼作用?當它創建控制器實例時,它試圖創建並注入一個依賴項。好的,爲什麼變量沒有官方化,如果沒有發生錯誤呢?
我已經延長我的崗位在肖恩·帕特里克·弗洛伊德的招標:
package testy.sprung; //import declarations ommited import testy.sprung.beany.AwiredBean; @Controller public class HelloWorldController { private Logger log = Logger.getLogger("springTestLogger"); @Autowired private AwiredBean oz; @RequestMapping("/sprung") public ModelAndView base() { log.debug("base URI"); ModelAndView mv = new ModelAndView(); mv.setViewName("firstPage"); return mv; } @RequestMapping(value="/{articel}/{subTitle}",method=RequestMethod.GET) public ModelAndView szia(@PathVariable("articel") String articel, @PathVariable("subTitle") String st, @RequestParam(value="co", required=false) String co) { log.debug("Path GET/{articel}/{subtitle}: " + articel + "/" + st + "?co=" + co); ModelAndView mv = new ModelAndView(); mv.setViewName("index"); // now put index.jsp in /WEB-INF/files mv.addObject("articel", articel); mv.addObject("subtl", st); mv.addObject("co", co); mv.addObject("awir", oz); //but it is null return mv; } }
bean實現任何空接口:
package testy.sprung.beany; public class AwiredBeanImpl implements AwiredBean { @Override public String toString() { return "CommonAutowired"; } public AwiredBeanImpl() { throw new Error("E"); } }
我運行它的測試裏面。測試失敗,因爲閹我的錯誤或NullPointerException
拋出:
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("file:WebContent/WEB-INF/sprung-servlet.xml") public class ZakladniExtendedTest extends TestCase { private MockHttpServletRequest request; private MockHttpServletResponse response; private HelloWorldController controller; @Inject private ApplicationContext context; public ZakladniExtendedTest() { PropertyConfigurator.configure("t-resources/log4j.properties"); } @Before //this method is called before each test public void setUp() { request = new MockHttpServletRequest(); response = new MockHttpServletResponse(); controller = new HelloWorldController(); } @Test public void testThemeResolverExists() { //this test works assertTrue(context.containsBean("themeResolver")); } @Test public void autowiringTest() throws Exception { //but this not request.setRequestURI("/title/subtitle"); request.setMethod("GET"); request.setParameter("co", "param"); ModelAndView mav = new AnnotationMethodHandlerAdapter().handle(request, response, controller); String viewName = mav.getViewName(); Map objects = mav.getModel(); assertEquals("index", viewName); //NullPointerException follows: assertEquals("CommonAutowired", objects.get("awir").toString()); } }
請顯示控制器類和彈簧配置的相關位 –
可能的重複[爲什麼我的Spring @Autowired字段爲空?](http://stackoverflow.com/questions/19896870/why-is-my-spring -autowired-field-null) – chrylis