title: java.lang.reflect.invocationtargetexception cause null in Junit
body: <p>I'm trying to run my junit test case, but it showing as nullpointerexception. when I debug its showing as java.lang.reflect.invocationtargetexception cause null. Please help me.</p>
  
  <p>public class StudentTest {</p>
  
  <p>StudentService stuService;</p>
  
  <pre><code>StudentDAO stuDAO;
  StudentVO stuVo;
  
  @Before
  public void setUp() throws Exception {
      System.out.println("In Setup");
      stuVo=new StudentVO ();
      stuService=new StudentService();
     stuDAO=Mockito.mock(StudentDAO.class);
      //MockitoAnnotations.initMocks(this);
      stuVo.setStudId("123");
      stuVo.setName("user1");
     Mockito.when(stuDAO.getStudent(stuVo.getStuId())).thenReturn(student);
  
  }
  
  @Test
  public void getStudent() throws DataAccessException {
      StudentVO stVO=stuService.getStudent(123)   ;
      Assert.assertEquals("123", stVO.getStuId());
  }
  </code></pre>
  
  <p>}</p>
  
  <p>My Service Class is</p>
  
  <pre><code>public class StudentService {
  @Inject
  StudentDAO stuDao;
  public StudentVo getStudent(String id){
      return stuDao.getStudent(id);
  }
  public StudentDAO getStuDao() {
      return stuDao;
  }
  }
  </code></pre>
  
  <p>In failure trace its just showing as "java.lang.NullPointerException</p>
  
  <pre><code>at com.stu.StudentService.getStudent(StudentService.java:104)
  at com.stu.junit.POCJunit.getgetStudent(StudentTest.java:21)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
  at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  </code></pre>