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Posted to java-dev@axis.apache.org by Ajith Ranabahu <aj...@gmail.com> on 2006/05/14 03:16:12 UTC
[Axis2][Axiom] Correct behavior for the getNamespace method
Hi all,
I've found that the cause of numerous bug reports concerning the
deserililzation of XMLBeans is actually an issue with the
getNamespaceURI(int index) method of the pullparser where it returns
null for the empty namespace URI. XMLBeans assumes the uri is never
null but the reader implementations (including the wstx implementation
that we use inside Axis2) return null for the empty namespace URI. I
can work around the bug but this is one fine point that should get
very clear about :)
The Javadoc for XMLStreamReader is silent on this
(https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
but since the empty namespace is decalred with an empty string, I
would say it should return an empty string rather than a null!
Thoughts ?
--
Ajith Ranabahu
PS - From a very quick test I've found out that the change occurred in
the transition of wstx version 2.8 to 2.9 - wstx 2.8.* returns "" but
2.9.* returns null!.
Re: [stax_builders] Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Tatu Saloranta <co...@yahoo.com>.
Dennis is right in that the most robust solution at
this point probably is to accept both null and "" to
indicate the empty/default namespace, since
historically this was not clearly defined (either by
the specs, or by StaxTest test suite).
For what it's worth, the consensus regarding this
issue, last time it was discussed on stax-builders
list , was that null should be returned; and thus both
Woodstox and the ref. impl., behave this way, with the
latest builds (2.9.3 wstx, 1.2rc2). I do not know if
sjsxp behaves this way, but change should be easy.
StaxTest test suite, likewise, now expects this
behavior as the correct one.
There is one more thing to be aware of: QName
implementations do not like nulls at all, so whenever
you get a QName instance, you generally never get
nulls, just empty strings. ;-/
-+ Tatu +-
--- Dennis Sosnoski <dm...@sosnoski.com> wrote:
> I believe this is actually an error in XMLBeans,
> given that the StAX
> specification doesn't specify the result. I ran into
> this when adding
> StAX support to JiBX. From what I saw the reference
> implementation
> always returns null for the no-namespace namespace,
> while the other
> implementations return an empty string. XMLBeans
> should accept either
> result.
>
> There's been discussion of a StAX 1.1 specification,
> which would
> hopefully clean up some of the many ambiguities and
> oversights in the
> current specification. AFAIK this is stuck in limbo,
> though, because BEA
> owns the specification and as I understand it
> they're the ones who'd
> need to initiate the 1.1 JSR.
>
> - Dennis
>
> Dennis M. Sosnoski
> SOA, Web Services, and XML
> Training and Consulting
> http://www.sosnoski.com - http://www.sosnoski.co.nz
> Seattle, WA +1-425-296-6194 - Wellington, NZ
> +64-4-298-6117
>
>
>
> Davanum Srinivas wrote:
>
> > Ajith,
> >
> > Do you have a stripped down test that we can use
> to chase the woodstox
> > folks for a fix?
> >
> > thanks,
> > dims
> >
> > On 5/13/06, Ajith Ranabahu
> <aj...@gmail.com> wrote:
> >
> >> Hi all,
> >> I've found that the cause of numerous bug reports
> concerning the
> >> deserililzation of XMLBeans is actually an issue
> with the
> >> getNamespaceURI(int index) method of the
> pullparser where it returns
> >> null for the empty namespace URI. XMLBeans
> assumes the uri is never
> >> null but the reader implementations (including
> the wstx implementation
> >> that we use inside Axis2) return null for the
> empty namespace URI. I
> >> can work around the bug but this is one fine
> point that should get
> >> very clear about :)
> >>
> >> The Javadoc for XMLStreamReader is silent on this
> >>
>
(https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
>
> >>
> >> but since the empty namespace is decalred with an
> empty string, I
> >> would say it should return an empty string rather
> than a null!
> >>
> >> Thoughts ?
> >>
> >> --
> >> Ajith Ranabahu
> >>
> >> PS - From a very quick test I've found out that
> the change occurred in
> >> the transition of wstx version 2.8 to 2.9 - wstx
> 2.8.* returns "" but
> >> 2.9.* returns null!.
> >>
> >
> >
>
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Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Dennis Sosnoski <dm...@sosnoski.com>.
I believe this is actually an error in XMLBeans, given that the StAX
specification doesn't specify the result. I ran into this when adding
StAX support to JiBX. From what I saw the reference implementation
always returns null for the no-namespace namespace, while the other
implementations return an empty string. XMLBeans should accept either
result.
There's been discussion of a StAX 1.1 specification, which would
hopefully clean up some of the many ambiguities and oversights in the
current specification. AFAIK this is stuck in limbo, though, because BEA
owns the specification and as I understand it they're the ones who'd
need to initiate the 1.1 JSR.
- Dennis
Dennis M. Sosnoski
SOA, Web Services, and XML
Training and Consulting
http://www.sosnoski.com - http://www.sosnoski.co.nz
Seattle, WA +1-425-296-6194 - Wellington, NZ +64-4-298-6117
Davanum Srinivas wrote:
> Ajith,
>
> Do you have a stripped down test that we can use to chase the woodstox
> folks for a fix?
>
> thanks,
> dims
>
> On 5/13/06, Ajith Ranabahu <aj...@gmail.com> wrote:
>
>> Hi all,
>> I've found that the cause of numerous bug reports concerning the
>> deserililzation of XMLBeans is actually an issue with the
>> getNamespaceURI(int index) method of the pullparser where it returns
>> null for the empty namespace URI. XMLBeans assumes the uri is never
>> null but the reader implementations (including the wstx implementation
>> that we use inside Axis2) return null for the empty namespace URI. I
>> can work around the bug but this is one fine point that should get
>> very clear about :)
>>
>> The Javadoc for XMLStreamReader is silent on this
>> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
>>
>> but since the empty namespace is decalred with an empty string, I
>> would say it should return an empty string rather than a null!
>>
>> Thoughts ?
>>
>> --
>> Ajith Ranabahu
>>
>> PS - From a very quick test I've found out that the change occurred in
>> the transition of wstx version 2.8 to 2.9 - wstx 2.8.* returns "" but
>> 2.9.* returns null!.
>>
>
>
Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Dennis Sosnoski <dm...@sosnoski.com>.
I believe this is actually an error in XMLBeans, given that the StAX
specification doesn't specify the result. I ran into this when adding
StAX support to JiBX. From what I saw the reference implementation
always returns null for the no-namespace namespace, while the other
implementations return an empty string. XMLBeans should accept either
result.
There's been discussion of a StAX 1.1 specification, which would
hopefully clean up some of the many ambiguities and oversights in the
current specification. AFAIK this is stuck in limbo, though, because BEA
owns the specification and as I understand it they're the ones who'd
need to initiate the 1.1 JSR.
- Dennis
Dennis M. Sosnoski
SOA, Web Services, and XML
Training and Consulting
http://www.sosnoski.com - http://www.sosnoski.co.nz
Seattle, WA +1-425-296-6194 - Wellington, NZ +64-4-298-6117
Davanum Srinivas wrote:
> Ajith,
>
> Do you have a stripped down test that we can use to chase the woodstox
> folks for a fix?
>
> thanks,
> dims
>
> On 5/13/06, Ajith Ranabahu <aj...@gmail.com> wrote:
>
>> Hi all,
>> I've found that the cause of numerous bug reports concerning the
>> deserililzation of XMLBeans is actually an issue with the
>> getNamespaceURI(int index) method of the pullparser where it returns
>> null for the empty namespace URI. XMLBeans assumes the uri is never
>> null but the reader implementations (including the wstx implementation
>> that we use inside Axis2) return null for the empty namespace URI. I
>> can work around the bug but this is one fine point that should get
>> very clear about :)
>>
>> The Javadoc for XMLStreamReader is silent on this
>> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
>>
>> but since the empty namespace is decalred with an empty string, I
>> would say it should return an empty string rather than a null!
>>
>> Thoughts ?
>>
>> --
>> Ajith Ranabahu
>>
>> PS - From a very quick test I've found out that the change occurred in
>> the transition of wstx version 2.8 to 2.9 - wstx 2.8.* returns "" but
>> 2.9.* returns null!.
>>
>
>
Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Davanum Srinivas <da...@gmail.com>.
Ajith,
Do you have a stripped down test that we can use to chase the woodstox
folks for a fix?
thanks,
dims
On 5/13/06, Ajith Ranabahu <aj...@gmail.com> wrote:
> Hi all,
> I've found that the cause of numerous bug reports concerning the
> deserililzation of XMLBeans is actually an issue with the
> getNamespaceURI(int index) method of the pullparser where it returns
> null for the empty namespace URI. XMLBeans assumes the uri is never
> null but the reader implementations (including the wstx implementation
> that we use inside Axis2) return null for the empty namespace URI. I
> can work around the bug but this is one fine point that should get
> very clear about :)
>
> The Javadoc for XMLStreamReader is silent on this
> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
> but since the empty namespace is decalred with an empty string, I
> would say it should return an empty string rather than a null!
>
> Thoughts ?
>
> --
> Ajith Ranabahu
>
> PS - From a very quick test I've found out that the change occurred in
> the transition of wstx version 2.8 to 2.9 - wstx 2.8.* returns "" but
> 2.9.* returns null!.
>
--
Davanum Srinivas : http://wso2.com/blogs/
Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Sanjiva Weerawarana <sa...@opensource.lk>.
On Sun, 2006-05-14 at 06:46 +0530, Ajith Ranabahu wrote:
> Hi all,
> I've found that the cause of numerous bug reports concerning the
> deserililzation of XMLBeans is actually an issue with the
> getNamespaceURI(int index) method of the pullparser where it returns
> null for the empty namespace URI. XMLBeans assumes the uri is never
> null but the reader implementations (including the wstx implementation
> that we use inside Axis2) return null for the empty namespace URI. I
> can work around the bug but this is one fine point that should get
> very clear about :)
+1 .. a difficulty with having multiple data bindings is figuring out
what works in what .. and who's fault it is when there's a bug :).
> The Javadoc for XMLStreamReader is silent on this
> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
> but since the empty namespace is decalred with an empty string, I
> would say it should return an empty string rather than a null!
+1.
Sanjiva.
Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Sanjiva Weerawarana <sa...@opensource.lk>.
On Sun, 2006-05-14 at 06:46 +0530, Ajith Ranabahu wrote:
> Hi all,
> I've found that the cause of numerous bug reports concerning the
> deserililzation of XMLBeans is actually an issue with the
> getNamespaceURI(int index) method of the pullparser where it returns
> null for the empty namespace URI. XMLBeans assumes the uri is never
> null but the reader implementations (including the wstx implementation
> that we use inside Axis2) return null for the empty namespace URI. I
> can work around the bug but this is one fine point that should get
> very clear about :)
+1 .. a difficulty with having multiple data bindings is figuring out
what works in what .. and who's fault it is when there's a bug :).
> The Javadoc for XMLStreamReader is silent on this
> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
> but since the empty namespace is decalred with an empty string, I
> would say it should return an empty string rather than a null!
+1.
Sanjiva.
Re: [Axis2][Axiom] Correct behavior for the getNamespace method
Posted by Davanum Srinivas <da...@gmail.com>.
Ajith,
Do you have a stripped down test that we can use to chase the woodstox
folks for a fix?
thanks,
dims
On 5/13/06, Ajith Ranabahu <aj...@gmail.com> wrote:
> Hi all,
> I've found that the cause of numerous bug reports concerning the
> deserililzation of XMLBeans is actually an issue with the
> getNamespaceURI(int index) method of the pullparser where it returns
> null for the empty namespace URI. XMLBeans assumes the uri is never
> null but the reader implementations (including the wstx implementation
> that we use inside Axis2) return null for the empty namespace URI. I
> can work around the bug but this is one fine point that should get
> very clear about :)
>
> The Javadoc for XMLStreamReader is silent on this
> (https://stax-utils.dev.java.net/nonav/javadoc/api/javax/xml/stream/XMLStreamReader.html#getNamespaceURI(int))
> but since the empty namespace is decalred with an empty string, I
> would say it should return an empty string rather than a null!
>
> Thoughts ?
>
> --
> Ajith Ranabahu
>
> PS - From a very quick test I've found out that the change occurred in
> the transition of wstx version 2.8 to 2.9 - wstx 2.8.* returns "" but
> 2.9.* returns null!.
>
--
Davanum Srinivas : http://wso2.com/blogs/