Target class must add "MongoEntity" annotation.

Question

1.eclipse + jdk1.8 + mongodb + maven (ssm框架)，启动时报错如题

2.public static <T> T convert(Document obj, Class<T> clazz) {

   ObjectMapping mapping = ObjectDBCollectionMappings.getMapping(clazz.getCanonicalName());
      if(mapping == null) { throw new RuntimeException("Target class must add \"MongoEntity\" annotation.");
   } else {        
    try {
        Object e = clazz.newInstance();后面省略........}
        
        
   上面的mapping引用来自：
   private static ConcurrentHashMap<String, ObjectMapping> classMap;
   public static ObjectMapping getMapping(String className) {
       return (ObjectMapping)classMap.get(className); 
   }

3.上面mapping 的debug结果：

(ObjectMapping)classMap.get(className)中的classMap里面找不到我需要的类，为什么呢？其他的比如：
{com.mzl.yowo2.businessConfig.entity.BusinessConfig=com.mzl.framework.repository.mongo.objectmappings.ObjectMapping@482a9726, com.mzl.yowo2.sepsTaskFlow.entity.SendExpressTaskFlow=com.mzl.framework.repository.mongo.objectmappings.ObjectMapping@25dfafec, com.mzl.yowo2.manager.entity.Manager=com.mzl.framework.repository.mongo.objectmappings.ObjectMapping@1d029130, com.mzl.yowo2.dormitory.entity.Dormitory=com.mzl.framework.repository.mongo.objectmappings.ObjectMapping@52f57f1e}是怎么存到classMap里面的也不清楚了。。。

4.不知道是不是我jdk1.8的问题？有什么解决方法吗？