Another solution:
 
You don't have to make the setters and getters private (i.e. setCustomerDao, getCustomer because the references they return are also private). Therefore the s/getters would be either protected or public allowing you to do the spring wiring as follows:
 
<bean id="customerServiceImpl" class="ke.co.x.x.CustomerServiceImpl">
             <property name="customerDao" ref="customerDao"/>
</bean>
 


--- On Mon, 5/25/09, Duggan Kim <mdkimani@gmail.com> wrote:

From: Duggan Kim <mdkimani@gmail.com>
Subject: Re: [Skunkworks] Spring DI and OOP inheritance:
To: "Skunkworks forum" <skunkworks@lists.my.co.ke>
Date: Monday, May 25, 2009, 10:09 AM

Found Solution:

The problem with my code is that the subclasses did not have a constructor making a call to super(). Turns out this was necessary to init the superclass, although it is usually left out in spring applications:

public subclass(){
     super();
}

On Mon, May 25, 2009 at 10:02 AM, Frankline Chitwa <frank.chitwa@gmail.com> wrote:
Hi, did you test if setCustoHi gmerDAO() actually sets your customerDao first before trying to get it?



On Mon, May 25, 2009 at 1:52 AM, Ashok Hariharan <ashok@parliaments.info> wrote:
On Sun, May 24, 2009 at 3:17 PM, Duggan Kim <mdkimani@gmail.com> wrote:
>
> Every other dependency is taken care of in Spring's
> applicationContext.xml config file in a similar manner.
>
> When tested using JUnit or on the browser, a NullPointerException is
> thrown at (2). The DAO
> defined in the superclass is null in the subclass. This raises the
> question whether Spring's DI supports normal Java class inheritance
> and if it does, is there any special config required for this?

I am not so familiar with spring as such... but  dependency injection
frameworks require interfaces for both implementing classes *and*
properties .... is the customerDAO object based on an interface ?

ashok


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