CODEWITHSUNDEEP
javareflection
Cilenco
Cilenco

Reputation: 7179

IllegalArgumentException in reflection Code

In my programm I tried to call a method over reflection with this code:

private void invokeMethod(Component sender, MouseEvent event)
{
    try 
    {
        System.out.println(name);
        Method method = frame.getClass().getMethod("onButton1Clicked", Component.class, MouseEvent.class); 
        method.invoke(sender, event);
    } 
    catch (Exception e) 
    { 
        e.printStackTrace();
    }
}

public void onButton1Clicked(Component sender, MouseEvent e)
{
    System.out.println("Test");
}

But if I run this code it comes to this exception:

java.lang.IllegalArgumentException: object is not an instance of declaring class

Any ideas where my mistake is?

Upvotes: 0

Views: 51

Answers (1)

jahroy
jahroy

Reputation: 22692

If the method in question is part of the Frame class, you need to invoke it on an instance of Frame.

A quick look at the JavaDoc tells you the first argument should be the instance on which the method will be invoked.

Try this:

method.invoke(frame, sender, event);

Upvotes: 1

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