Junit测试 - 初始化异常错误

Question

//registry Class
public class Registry
{

   private static final Logger logger = LogFactory
         .getLogger(Registry.class);

   protected Service service = new serviceMLImpl();
   private static Registry instance = new Registry();

   public static Registry getInstance()
   {
      return instance;
   }

   public static void setInstance(Registry instance)
   {
      Registry.instance = instance;
   }

   public Helper getHelper()
   {
      return new Helper();
   }


}


//Helper Class
public class Helper
{

   protected Service  service = ServiceRegistry
       .getService();

   public Helper()
   {
   }

   public void sendInfo(Info info)
       throws Exception
   {
      service.sendInfo(info);

   }

   public void sendFacilitySFPListNotification(
       List<GcpFacilitySFPInfo> esfpPortList)
   {
      gfpGcpService.sendFacilitySFPListNotification(esfpPortList);
   }

}

//Test Class

public class RegistryTest
{

   Registry registry = new Registry();
   Helper helper = createMock(Helper.class);

   @Before
   public void setUp() throws Exception
   {

   }

   @After
   public void tearDown() throws Exception
   {
      registry = null;
   }

   @Test
   public void testGetInstance()
   {
      replayAll();
      registry.getInstance();
      verifyAll();
   }

   @Test
   public void testSetInstance()
   {
      replayAll();
      registry.setInstance(registry);
      verifyAll();
   }

   @Test
   public void testGetHelper()
   {
      **replayAll();
      new Helper();
      registry.getHelper(); // getting InitializationExceptionError here
      verifyAll();**              //
   }

}

有两个类，帮助程序和注册表类。我尝试为注册表类编写junit，但在测试类中得到了 InitializationException 。

这是我在registry.getHelper（）中遇到的错误：

java.lang.ExceptionInInitializerError at java.lang.Class.forName0(Native Method) at
java.lang.Class.forName(Class.java:169) at
javassist.runtime.Desc.getClassObject(Desc.java:44) at
javassist.runtime.Desc.getClassType(Desc.java:153) at
javassist.runtime.Desc.getType(Desc.java:123) at
javassist.runtime.Desc.getType(Desc.java:79) at
com.att.bbnms.cim.gfpgcp.service.ServiceRegistry.getService(ServiceRegistry.java‌​:41) at
com.att.bbnms.cim.nc.service.link.Helper.(Helper.java:14) at
com.att.bbnms.cim.nc.service.link.Registry.getHelper(Registry.java:26) at
com.att.bbnms.cim.nc.service.link.egistryTest.testGetHelper(RegistryTest.java:63‌​) at
org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66) at
org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$Po‌​werMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:‌​312) at
org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86) at
org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadi‌​e.java:94) at
org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$Po‌​werMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:29‌​6) at 

在为 Helper 编写测试用例时，我无法上课。 请告诉您是否有任何解决方案。