Re: [aspectj-users] Accessing protected methods of parent class from wit

[Andy Clement <andrew.clement@xxxxxxxxx>]

Hi,

This does characterise exactly what you are hitting:

> As it seems "ajc" can not weave the code into the parent class since it is in another project.

The accessor needs to be added to the parent and we can't do that
because we haven't been given access to it.  And that, indeed, is what
the message is telling us:

 "This affected type is not exposed to the weaver: com.somewhere
(needed for privileged access [Xlint:typeNotExposedToWeaver])"

I can imagine a modification to the weaver that attempted to add the
accessor solely at the point in the hierarchy that needed it (so into
'Child' in my example).

But to get you going now, really, you have to provide the weaver
access to make that change to Parent.  This would involve putting the
library containing the parent on the inpath rather than the classpath.
 I think in maven terms this gets called 'weaveDependencies' in your
pom setup.  If you put the library on there that contains Parent it
will get woven into the same output folder as the current
compile/weave step and have the accessor added.

cheers,
Andy

On 24 May 2012 11:17, Sina <my.linked.account@xxxxxxxxxxxxxx> wrote:
> Hi Andy,
>
> First of all: the autocomplete function in my IDE (Eclipse 3.7.1) does not list the protected method as child's methods. (Is this the normal behavior?)
> Second : when I write c.foo() in my aspect I get this warning from eclipse:
>
> "This affected type is not exposed to the weaver: com.somewhere (needed for privileged access [Xlint:typeNotExposedToWeaver])"
> there are some differences between your config and mine.
>
> 1- Instead of exposing the Child class I'm exposing the parent class.
> I don't think that should be problem, since I tried exposing both of classes in a dummy project and that has worked.
>
> 2-I'm using maven and I have different modules. My aspect and the child class are in the same maven module, but the Parent is in another module.
> The output of the parent module will be provided as a jar file to the module in which the child exists. (using dependencies in pom.xml)
>
> As it seems "ajc" can not weave the code into the parent class since it is in another project.
> If this is true, do you suggest any solution? (can I weave it into the jar file ? somehow?)
>
>
> Cheers,
> Sina
>
>
>
>
>
> On May 22, 2012, at 8:48 PM, Andy Clement wrote:
>
>> Hi Sina,
>>
>> That should work, the use of 'privileged' should cause generation of
>> an accessor method that can then be used by the aspect.
>>
>> here is my sample:
>>
>> ==== 8< ==== Parent.java
>> package com.somewhereelse;
>>
>> public class Parent {
>>
>>       protected void foo() {
>>               System.out.println("foo!");
>>       }
>> }
>> ===== 8< ====
>> ===== 8< ==== Child.java
>> package com;
>>
>> import com.somewhereelse.Parent;
>>
>> public class Child extends Parent {
>>
>>       public static void main(String[] args) {
>>               new Child().m();
>>       }
>>
>>       public void m() {
>>
>>       }
>> }
>> ===== 8< ==== Overthere.aj
>> package xxx;
>> import com.Child;
>>
>> privileged aspect Overthere {
>>
>>       before(Child c): execution(* Child.m(..)) && this(c) {
>>               c.foo();
>>       }
>> }
>> ===== 8< ====
>>
>>> ajc -1.5 com/Child.java com/somewhereelse/Parent.java xxx/Overthere.aj -showWeaveInfo -d output
>>
>> Join point 'method-execution(void com.Child.m())' in Type 'com.Child'
>> (Child.java:11) advised by before advice from 'xxx.Overthere'
>> (Overthere.aj:6)
>>
>>> cd output
>>> java com.Child
>> foo!
>>
>> Here is the accessor in the Parent class:
>>
>>> javap com.somewhereelse.Parent
>> Compiled from "Parent.java"
>> public class com.somewhereelse.Parent extends java.lang.Object{
>>    public com.somewhereelse.Parent();
>>    protected void foo();
>>    public void ajc$privMethod$xxx_Overthere$com_somewhereelse_Parent$foo();
>> }
>>
>> So what is different about your configuration from mine?
>>
>> cheers,
>> Andy
>>
>> On 21 May 2012 09:25, Sina <my.linked.account@xxxxxxxxxxxxxx> wrote:
>>> Hi there.
>>>
>>> I have Parent class and a child one. The parent class has
>>> some protected  methods.
>>> My pointcut works on methods of the child class. The problem is that I want
>>> to access protected methods of the parent in my Aspect, but they are not
>>> visible from within my Aspect.
>>>
>>> All these 3 classes (Parent, Child, Aspect) are in different packages.
>>>
>>> I read here http://dev.eclipse.org/mhonarc/lists/aspectj-users/msg03270.html
>>> that using privileged  modifier will solve the problem but it does not work
>>> for me.
>>> Any idea??
>>>
>>> Sina
>>>
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>>> aspectj-users@xxxxxxxxxxx
>>> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>>>
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