No Such Method Exception in Java

Like the InvocationTargetException (above), the NoSuchMethodException is related to the use of reflection. This error stems from trying to access a provided method name that either does not exist or is configured as a private method. Consider the simple example below:

public class Example {
  public int divide(int numerator) {
    return numerator / 0;
  }
     public int addOne(int number) {
         return doSomethingPrivate(number);
     }
     private int doSomethingPrivate(int number) {
         return number++;
     }
 }

The doSomethingPrivate() method is a private method and not visible in the following scenario:

Class c = Class.forName("Example");
Method method = c.getDeclaredMethod("doSomethingPrivate", parameterTypes);
method.invoke(objectToInvokeOn, params);

As a result, it throws a NoSuchMethodException.