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POBehaviours of new constructor added by AspectJ ITD
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2013-07-15T05:52:12.197
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2013-07-16T04:45:18.053
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Body
I am currently applying AspectJ to our project, and I found a behavior which is a bit strange to me. Q1: I added a new constructor to my current class with inter-type declaration, and found that the class's member variable is not initialized if the new constructor is used to instantiate my class. For example: The class which I'll add a new constructor to: <pre><code>public class Child { public String name = "John"; public Child(String desc) { // TODO Auto-generated constructor stub } } </code></pre> The aspectJ code: <pre><code>public aspect MyTest { public Child.new(String desc, int num) { System.out.println("Child Name:" + this.name); } } </code></pre> If I instantiate the Child with the new constructor: <pre><code>new Child("A child", 5) </code></pre> the member variable this.name is not initialized as will be done with the original constructor. But, if I call the original constructor: <pre><code>new Child("A child") </code></pre> the member variable this.name will be initialized to "John" as usual The result: <blockquote> Child Name:null </blockquote> Is this a limitation of AspectJ? Is there anyway to resolve this issue? I don't really want to add the code for member variable initialization to the new constructor. Q2: It seems in the newly added constructor, super.method() can not be correctly resolved. The class which I'll add a new constructor to: <pre><code>public class Child extends Parent{ public String name = "John"; public Child(String desc) { } } </code></pre> Child extends Parent. Parent has a method init() <pre><code>public class Parent { public void init() { //.... } } </code></pre> I add a new constructor for the Child in my aspect. <pre><code>public aspect MyTest { public Child.new(String desc, int num) { super.init(); } } </code></pre> The above aspect code will trigger an exception. <pre><code>Exception in thread "main" java.lang.NoSuchMethodError: com.test2.Child.ajc$superDispatch$com_test2_Child$init()V at MyTest.ajc$postInterConstructor$MyTest$com_test2_Child(MyTest.aj:19) at com.test2.Child.<init>(Child.java:1) at MainProgram.main(MainProgram.java:11) </code></pre> My workaround is to define another method for my class Child, and indirectly call the super.method() within that method For example, add a new method that calls super.init() for Child <pre><code>public void Child.initState() { super.init(); } </code></pre> Now, I can call initState() in the newly added constructor like below: <pre><code>public aspect MyTest { public Child.new(String desc, int num) { this.initState(); } } </code></pre> Is this a limitation of AspectJ? Is this the only way to resolve this issue? Thank you all for your time :)
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<aop><aspectj>
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Behaviours of new constructor added by AspectJ ITD
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1. PO
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1. COhi is anyone familiar with aspectj ? Any information is welcome!
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 POBehaviours of new constructor added by AspectJ ITD
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