java - Exception when invoke reflection Class.getMethod -

i have below code invokes method using reflection. getting,

java.lang.illegalargumentexception: wrong number of arguments

exception @ method.invoke. reason?

public class b {     public static void main(string[] args) {         a = new a();         method m;         try {             m = a.getclass().getmethod("m3",integer.class);             m.invoke(a);         } catch (exception e) {             e.printstacktrace();         }     } }  public class {         public void m3(integer x){         system.out.println("ssss");     } } 

the invoke(object, object...)-method takes it's first parameter object method should invoked on (as did correctly) , then variable-length parameter parameters should passed to method call.

in case, you're forgetting methods integer-parameter. method you're trying call a.m3(), doesn't exist in class.

the correct call be:

m.invoke(a, 12); // or int/integer it's second parameter