"Here I want to invoke all methods of newUser object inside ReflectionUtil Class (Actually all 'get' methods)".

===========================================
RefletctionUtil util = new RefletctionUtil();

User newUser = (User)myDb.hibSelect(tblObj, tblObj.getUser_id());

String methodNames = (String) util.getAllMethods(newUser);
===========================================

* Above Code snippet is OK, Problem is inside 'ReflectionUtil Class'

===========================================
public class RefletctionUtil
{
public Object getAllMethods(User obj)
{
//to get all attributes and behaviors of this object
Method[] declaredMethods = obj.getClass().getDeclaredMethods();
Field[] declaredFields = obj.getClass().getDeclaredFields();

Object arr = "";
//iterate through the fields.
for(Field field:declaredFields)
{
try {
//while iterating call getMethodName method for get relavant get method for particular attribute.
arr = arr+field.getName()+"::=::"+getMethodName(field.getName(), obj)+";\n";
} catch (IllegalArgumentException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
}
}
return arr;


}

public Object getMethodName(String name, Object obj)
{
try {
String prefix = "get";
String methodName = "";
Class myClass = obj.getClass();

String tempName = name;

tempName = Character.toUpperCase(tempName.charAt(0)) + tempName.substring(1);
methodName = prefix + tempName;

Method classMethod = myClass.getMethod(methodName);
System.out.println(myClass.toString());
return classMethod.invoke(myClass);

} catch (IllegalAccessException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
return "IllegalAccessException";
} catch (IllegalArgumentException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
return "IllegalArgumentException";
} catch (InvocationTargetException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
return "InvocationTargetException";
} catch (NoSuchMethodException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
return "NoSuchMethodException";
} catch (SecurityException ex) {
Logger.getLogger(RefletctionUtil.class.getName()).log(Level.SEVERE, null, ex);
return "SecurityException";
}
}
}

==========================================

**'return classMethod.invoke(myClass); ' line returns an exception
a 'IllegalArgumentException'

**And my IDE shows 'java.lang.IllegalArgumentException: object is not an instance of declaring class'

**But methods all are members of 'User' class. So I dont know why this exception is?

Im stuck with this problem.

Shouldn't you call classMethod.invoke(obj);?

I called it, you can see it in the above code like.

'return classMethod.invokde'

hi,

just check it whether the invoke method is having one argument method or not? i think it is having 2 arguments..


hope it solves,dont forget to rate me,

regards

Yes.... but with 'myClass' as the argument and not 'obj'. I guess it is the 'obj' object that has a getter method not the 'myClass' object.