Java Reflection: Trying to access a constrcutor with an array argument.

Question

Having some reflection problem... upon reflection maybe I shouldn't use reflection... :-)
The classes I use to test this are defined as follows:
class MyTestClass{
  public long[] _array;
  public MyTestClass(long[] array)
    _array = array;
class MyTestClass2{
  public int[] _array;
  public MyTestClass2(int[] array)
    _array = array;
class MyTestClass3{
  public String[] _array;
  public MyTestClass3(String[] array)
    _array = array;
class MyTestClass4{
  public Long[] _array;
  public MyTestClass(Long[] array)
    _array = array;
}and this is how I try to access it:
  // Only classes that have a constrcutor with a single
  // param which is an array can be used with this method.
  // The class also has to define a public field called "_array"
  // which is of the ssame type as the parameter of the
  // constructor
  public Object getNewInstanceOf(String className)
    // getValues uses reflection to instanciate an array of objects of
    // certain types which are not known to start with, i.e getValues
    // can return Long[] or Integer[] or String[]
    Object[] values = getValues();
    Class myClass = Class.forName(className);
    myClass..getField("_array");
    Class paraClass = field.getType();
     Constructor constructor = myClass
                .getConstructor(new Class[]{paraClass});
    // the problem occurs here, I think I would have to cast "values" to the
    // proper array type, but don't know how to do this using reflection.
    Object  myInstance = constructor.newInstance(new Object[]{values});
   return myInstance;
  private Object[] getValues()
    // use reflection to create the array
  }and this is the error I get
java.lang.IllegalArgumentException: argument type mismatch

Answer 1

we can be much helpfull if we do not know which line excatly throws exception
normaly stack trace shows the line number so can you re-post your code highlitine the line which throws given exception