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@Around annotation / <aop:around> Configaration in XML file, showing unexpected Output

 
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Hi All,

I posted all my code below.

spring.xml


LoggingAspect.java


Triangle.java


Circle.java


Sahpe.java


AopTester.java


Output is:


Its perfect. But, In AOPTester.java if you replace LINE 1 as

It's giving NullPointerException. I thought output would be


Can anyone Explain me, what's happening(cause for exception) when I call ?


Second Doubt:
When I print that, like


It's showing "null". why?
Thanks:
Ramakrishna k.c
 
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You have not initialized the circle member inside your shape. So, shape.getCircle returns null. When you try to call getName on shape.getCircle, you get a NPE.

You should inject the circle into the shape.
 
Ramakrishna Udupa
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Jayesh A Lalwani wrote:You have not initialized the circle member inside your shape. So, shape.getCircle returns null. When you try to call getName on shape.getCircle, you get a NPE.

You should inject the circle into the shape.



Why should I initialize that? In spring.xml, I think the below line will take care of initialization.



am I right?
 
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1. With debugger + doc:
There is NO issue with DI autowired byName.
The issue is with the @Around advice code.

2. Read
From Sprimg 4.0.4.RELEASE doc:
8. Aspect Oriented Programming with Spring
Around advice page 204
public class AroundExample

3. See green Comment. You need to return the Object. (Your version did not.)

 
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