Instanceof failed while getClass().getName() is right

Question

Hi, everyone
What may cause instanceof operator returns false while getClass().getName() returns the right class name?
I get a list through JMX. At first, I print the type of elements in the list. It is what I want. But ClassCastException is raised when I want to cast the element into the required type. With great supprise, I check the element with instanceof operator, it returns false. I am puzzled. Here are source codes:
String[] type = {"para"};
String[] sig = {"java.lang.String"};
List list = (List) server.invoke(ManagerMBean.OBJECT_NAME, "getAppsbyType", type, sig); // get objects in the MBeanServer
Iterator iter = list.iterator();
while (iter.hasNext()) {
Object obj = iter.next();      
System.out.println(obj.getClass().getName()); // the ouptut is A
if(obj instanceof A ) {
     System.out.println("....................................it is A");
}else{
     System.out.println("....................................it is not A"); // it is executed
A a= (A) obj; // ClassCaseException occured
Does anybody encounter similar problem?
Any help is appreciated!

Answer 1

What may cause instanceof operator returns false while
getClass().getName() returns the right class name?The object passed to instanceof is of a type that was loaded in a different classloader than the calling object's class.