Defining my own DynaActionForm

[Mahesh Babu J]

Please help me if I am doing anything wrong while trying to define my own
DynaActionForm.

1. Define MyDynaForm extends DynaActionForm
      * define some methods that will be able to expose the
        property names in this form bean.
        like: getAllPropertyNames() that returns collection of
        string property names.

      * override the getDynaProperty method that can
        return the DynaProperty object for the argument property
        name.

2. In the jsp file,

    By using the getAllPropertyNames, the jsp file should be
    able to display all the property values.

With this approach, while MyDynaForm is instantiated first,
it is throwing NullPointerException as below:

java.lang.NullPointerException
        at
org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(PropertyUtils.j
ava:1072)
        at
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.j
ava:694)
        at
org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:72
4)
        at
org.apache.commons.beanutils.BeanUtils.getArrayProperty(BeanUtils.java:218)
        at org.apache.struts.taglib.html.SelectTag.doStartTag(SelectTag.java:293)
        at org.apache.jsp.selectType$jsp._jspService(selectType$jsp.java:131)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet

I am not understanding this error. Please suggest me a way-out of this
problem.

Am I missing something here.

Thanks,
Mahesh