asterisk-java-users

[Asterisk-java-users] Converting ManagerResponse to ExtensionStateResponse

[Maciek T. <mlo...@gm...>]

Hi all,
i have one problem: when I'm trying to handle response to
ExtensionStateAction I do something like that:

ExtensionStateResponse resp;
            try {
                resp=(ExtensionStateResponse)conn.sendAction(action);
                return resp.getStatus();
            } catch (Exception ex) {
                System.out.println(ex.toString());
                return null;
            }

where "conn"'s type is ManagerConnection.
But there is no way to cast ManagerResponse to ExtensionStateResponse.

NetBeans gives me output as follow:
java.lang.ClassCastException:
org.asteriskjava.manager.response.ManagerResponse cannot be cast to
org.asteriskjava.manager.response.ExtensionStateResponse

It is weird because ExtensionStateResponse extends ManagerResponse.

Any ideas?


-- 
Pozdrawiam
Maciek Tokarski

Re: [Asterisk-java-users] Converting ManagerResponse to ExtensionStateResponse

[David R. <dr...@in...>]

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Maciek Tokarski wrote:

> NetBeans gives me output as follow:
> java.lang.ClassCastException:
> org.asteriskjava.manager.response.ManagerResponse cannot be cast to
> org.asteriskjava.manager.response.ExtensionStateResponse

Find out what resp's type really is and work from there.


	David
- --
INA Service GmbH
Papenreye 63
22453 Hamburg
Germany

Mail: in...@in...
Phone: +49 (0)40 557 07-07
Fax: +49 (0)40 557 07-100

Geschäftsführer: Ines M. Hoerner

Amtsgericht Hamburg
HRB 96470
Ust-IdNr. DE248754961
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Re: [Asterisk-java-users] Converting ManagerResponse to ExtensionStateResponse

[Maciek T. <mlo...@gm...>]

Hi,

David Roden wrote:
>Find out what resp's type really is and work from there.

maybe I do not understand the question but the type of resp variable is
ExtensionStateResponse

conn.SendActrion(action) returns variable that type is ManagerResponse.

I've made some experiment:
function as follows:

 public void ConvTest() {
        ManagerResponse resp1= new ManagerResponse();
        ExtensionStateResponse resp2=new ExtensionStateResponse();
        resp2=(ExtensionStateResponse)resp1;
    }
doesn't log classes cast problems, but it throws null-pointer exception.

I think it's a bug in asterisk-java
-- 
Pozdrawiam
Maciek Tokarski

Re: [Asterisk-java-users] Converting ManagerResponse toExtensionStateResponse

[Martin S. <ma...@be...>]

Hi Maciek ,
=20
Your test is nice and good, except it doesn't test the problem you're
running into.
=20
It sounds like you *want* to test:
=20
=20
 public void ConvTest() {
        ManagerResponse resp1=3D new ExtensionStateResponse();
        ExtensionStateResponse resp2=3D(ExtensionStateResponse)resp1;
    }
=20
A better question is... When the cast fails in your code, print out
resp1.getClass() and see if the thing you're casting really is something
you can cast from. Also, be aware that there are legitimately cases
where ManagerConnection.sendAction may not return the type you expect,
or may return a null value.

In your original snippet, I would do the following:

       ManagerResponse response =3D conn.sendAction(action);
      =20
       if(response !=3D null)
      	 System.out.println(response.getClass());
       else
      	 System.out.println("Response was null");
      =20
       // later on, cast it if response.getClass() =3D=3D
ExtensionStateResponse.class
	  // or if (response instanceof ExtensionStateResponse) <-- I
prefer this one better


Best,
=20

Martin Smith, Systems Developer
ma...@be...
Bureau of Economic and Business Research
University of Florida
(352) 392-0171 Ext. 221=20

=20


________________________________

	From: ast...@li...
[mailto:ast...@li...] On Behalf Of
Maciek Tokarski
	Sent: Friday, July 20, 2007 7:55 AM
	To: ast...@li...
	Subject: Re: [Asterisk-java-users] Converting ManagerResponse
toExtensionStateResponse
=09
=09
	Hi,=20
=09
	David Roden wrote:
	>Find out what resp's type really is and work from there.
=09
	maybe I do not understand the question but the type of resp
variable is ExtensionStateResponse
=09
	conn.SendActrion(action) returns variable that type is
ManagerResponse.=20
=09
	I've made some experiment:
	function as follows:
	=20
	 public void ConvTest() {
	        ManagerResponse resp1=3D new ManagerResponse();
	        ExtensionStateResponse resp2=3Dnew
ExtensionStateResponse();
	        resp2=3D(ExtensionStateResponse)resp1;
	    }
	doesn't log classes cast problems, but it throws null-pointer
exception.=20
=09
	I think it's a bug in asterisk-java
	--=20
	Pozdrawiam
	Maciek Tokarski=20