java.lang.NoSuchMethodException and the parameterized constructor -

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i have class foo follows:

public class foo extends bar {     public foo(com.example.x displaystate, com.example.y parent)     {         super(displaystate, parent);     } }

the bar class shown below:

public abstract class bar {      public bar(com.example.x displaystate, com.example.y parent)     {         // received params     } }

additionally, there factory class following method:

 public static object getinstance(class thesourceclass, class thetargetclass, class[] parameterclasses, object[] parametervalues)  {      class theclass = (thetargetclass == null) ? thesourceclass : thetargetclass;       try      {          constructor classconstructor = theclass.getconstructor(parameterclasses);          return classconstructor.newinstance(parametervalues);      }      catch (nosuchmethodexception exp)      {          // log      }

the problem nosuchmethodexception exception arises:

java.lang.nosuchmethodexception: com.example.foo.<init>(com.example.x, com.example.y) @ java.lang.class.getconstructor0(class.java:2715)  @ java.lang.class.getconstructor(class.java:1659) @ com.example.myfactory.getinstance(myfactory.java:30)

i have debugged code , class information has correct details defined constructor; however, exception here.

does have idea missed? thanks!

the following example produce instance of foo. example ensures constructor in bar exists accepts x , y.

foo.java

public class foo extends bar {     public foo(com.example.x displaystate, com.example.y parent) {         super(displaystate, parent);     } }

bar.java

import com.example.x; import com.example.y;   public class bar {      public bar(x displaystate, y parent) {         // todo auto-generated constructor stub     }  }

x.java

package com.example;  public class x {  }

y.java

 package com.example;  public class y {  }

test.java

import java.lang.reflect.constructor;  import com.example.x; import com.example.y;  public class test {     public static void main(string[] args) {         class[] classes = {x.class, y.class};         object[] values = {new x(), new y()};          object obj = getinstance(foo.class, null, classes, values);          system.out.println(obj);     }      public static object getinstance(class thesourceclass,             class thetargetclass, class[] parameterclasses,             object[] parametervalues) {         class theclass = (thetargetclass == null) ? thesourceclass                 : thetargetclass;          try {             constructor classconstructor = theclass                     .getconstructor(parameterclasses);             return classconstructor.newinstance(parametervalues);         } catch (exception e) {          }         return null;     } }

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