[BeanUtils] Problem using BeanUtils.copyProperties() to Complex Java Bean

[lc kin]

Dear Sir/Madam,

        I am new to the BeanUtils component, I am facing
problem of copy properties from 1 complex bean to
another complex 

bean by using BeanUtils.copyProperties(), Below is the
java bean's code:

import java.util.ArrayList;
public class ComplexBean implements
java.io.Serializable {
        SimpleBean simple;
        ArrayList col = new ArrayList();

        public ComplexBean() {
                super();
        }
        
        public void add(Object b) {
                col.add(b);
                
        }

        public ComplexBean[] getCol() {
                return (ComplexBean[])col.toArray(new
ComplexBean[col.size()]);
        }
        
        public ComplexBean getCol(int index) {
                return (ComplexBean)col.get(index);
        }

        public void setCol(int index, ComplexBean simple) {
                col.set(index, simple);
        }
        
        public SimpleBean getSimple() {
                return simple;
        }

        public void setCol(ComplexBean[] complexBeans) {
                for (int loop=0;loop < complexBeans.length; loop++)
                        col.add(complexBeans[loop]);
        }

        public void setSimple(SimpleBean bean) {
                simple = bean;
        }

}


import java.sql.Date;

public final class SimpleBean implements
java.io.Serializable  {
        private String name;
        private long value;
        private double price;
        private Date dob;
        public SimpleBean() {
                super();
        }

        public Date getDob() {
                return dob;
        }

        public String getName() {
                return name;
        }

        public double getPrice() {
                return price;
        }

        public long getValue() {
                return value;
        }

        public void setDob(Date date) {
                dob = date;
        }

        public void setName(String string) {
                name = string;
        }

        public void setPrice(double d) {
                price = d;
        }

        public void setValue(long l) {
                value = l;
        }
        
}
-----------------------------------------------------------------------------------------
I use the following code to test it, 

                SimpleBean simple = new SimpleBean();
                simple.setDob(new java.sql.Date(new
java.util.Date().getTime())); 
                simple.setName("Simple Test");
                simple.setPrice(12.80);         
                simple.setValue(12134);
                
                ComplexBean complex = new ComplexBean();
                complex.setSimple(simple);
                ComplexBean complexEx = new ComplexBean();
                complexEx.setSimple(simple);
                complexEx.add(complex);
                
                Map complexMapEx = BeanUtils.describe(complexEx);
                ComplexBean dest_complex = new ComplexBean();
                BeanUtils.copyProperties(dest_complex,
complexMapEx);

but BeanUtils.copyProperties throw
IllegalArgumentException stack trace as following
java.lang.IllegalArgumentException: argument type
mismatch
        at java.lang.reflect.Method.invoke(Native Method)
        at
org.apache.commons.beanutils.PropertyUtils.setSimpleProperty(PropertyUtils.java:1789)
        at
org.apache.commons.beanutils.BeanUtils.copyProperty(BeanUtils.java:450)
        at
org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:248)
        at beanutils.BeanUtil.main(BeanUtil.java:90)

May I know how to solve his problem. Is there anything
wrong in SimpleBean and ComplexBean?

Best Regards - CK Lim

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