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POHow to get the class of a field of type T?
 

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  1. POHow to get the class of a field of type T?
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    <p>I write JUnit tests for some Spring MVC Controllers. The initialization of the JUnit test is common for all my Controllers tests, so I wanted to create an abstract class that does this initialization.</p> <p>Thus, I created the following code:</p> <pre><code>@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "classpath*:spring/applicationContext-test.xml", "classpath*:spring/spring-mvc-test.xml" }) @Transactional public abstract class AbstractSpringMVCControllerTest&lt;T&gt; { @Autowired protected ApplicationContext applicationContext; protected MockHttpServletRequest request; protected MockHttpServletResponse response; protected HandlerAdapter handlerAdapter; protected T controller; @SuppressWarnings("unchecked") @Before public void initContext() throws SecurityException, NoSuchFieldException { request = new MockHttpServletRequest(); response = new MockHttpServletResponse(); handlerAdapter = applicationContext.getBean(AnnotationMethodHandlerAdapter.class); // Does not work, the problem is here... controller = applicationContext.getBean(T); } } </code></pre> <p>The idea is to create, for each controller I want to test a JUnit test class that extends my <code>AbstractSpringMVCControllerTest</code>. The type given in the <code>extends</code> declaration is the class of the <strong>Controller</strong>.</p> <p>For example, if I want to test my <code>AccountController</code>, I will create the <code>AccountControllerTest</code> class like that:</p> <pre><code>public class AccountControllerTest extends AbstractSpringMVCControllerTest&lt;AccountController&gt; { @Test public void list_accounts() throws Exception { request.setRequestURI("/account/list.html"); ModelAndView mav = handlerAdapter.handle(request, response, controller); ... } } </code></pre> <p>My problem is located in the last line of the <code>initContext()</code> method of the abstract class. This abstract class declares the <code>controller</code> object as a <code>T</code> object, but how can say to the Spring Application Context to return the bean of type <code>T</code>?</p> <p>I've tried something like that:</p> <pre><code> Class&lt;?&gt; controllerClass = this.getClass().getSuperclass().getDeclaredField("controller").getType(); controller = (T) applicationContext.getBean(controllerClass); </code></pre> <p>but <code>controllerClass</code> returns the <code>java.lang.Object.class</code> class, not <code>AccountController.class</code>.</p> <p>Of course, I can create a <code>public abstract Class&lt;?&gt; getControllerClass();</code> method, which will be overriden by each JUnit Controller test class, but I prefer to avoid this solution.</p> <p>So, any idea?</p>
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    1. COIf you have a better idea for the question title, do not hesitate :)
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    2. COWelcome to the java type erasure nightmare.
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    3. COIt's impossible. Duplicate of [Get type name for generic parameter of generic class](http://stackoverflow.com/questions/6624113/get-type-name-for-generic-parameter-of-generic-class)
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