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Re: [wtp-dev] Re: [wtp-releng] help needed on build test failures

Hi Karen,

The changes Dave alluded to are only applicable to the WTP XML validator. These changes were made quite a while back (WTP 3.0, https://bugs.eclipse.org/bugs/show_bug.cgi?id=205989) and I very much doubt they will impact code other than the the WTP XML validator.

I have asked around and it seems that the most likely cause of the issue you're experiencing is a ClassLoader issue. It is possible that your code is loading different parts of Xerces from different sources (JDK and perhaps the WTP Xerces plug-in?). In that case, the two classes are not compatible because their interfaces are loaded by different ClassLoaders.
 
I hope this helps.

Regards,
Valentin Baciu
Rational XML Web Services Tools


From: karen moore <karen.moore@xxxxxxxxxx>
To: Webtools releng discussion list <wtp-releng@xxxxxxxxxxx>, wtp-dev@xxxxxxxxxxx
Date: 06/30/2009 12:51 PM
Subject: [wtp-dev] Re: [wtp-releng] help needed on build test failures
Sent by: wtp-dev-bounces@xxxxxxxxxxx




Sending to wtp-dev for a larger audience. Valentin, David said you have
worked in this area recently?

I just don't see how content-types in core eclipse can work if
SAXParserFactory is so flaky. While they don't call SAXParserFactory in
their XmlRootHandler, it *is* being used under the covers in the
Activator class.  This means that core eclipse uses it, JST uses it in
their copy of XmlRootHandler, and for some reason it happens not to work
in the JPT copy?  I'm not really comfortable just randomly setting flags
in hopes things might work.

I'm ok with trying out your second suggestion, I just don't understand
why we would have to do it that way when others don't.  And maybe our
tests will just happen to pass the next time the build runs?  Awfully
suspicious we have never seen this problem before.

Thanks,
Karen

On 6/30/2009 12:20 PM, David Carver wrote:
> Now I think we are getting to the reason for the issue.  
> SAXParserFactory is the JAXP  way of creating the SaxFactory to be
> used.  However since you let JAXP determine and figure out the
> configuration and the parser to be used, you can run into
> configuration issues.
> My experience with using JAXP within OSGI based bundles is that you
> can get some unexpected results that crop up.   There are a couple of
> possible solutions.
>
>
> 1. Try setting the setXIncludeAware() method to either true or false
> to see if that fixes your problem.   You many need to set the other
> configuration options as well.
>
> http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/parsers/SAXParserFactory.html
>
>
>
> 2. Call and use the Xerces specific implementations directly, and
> setup your configurations.
> I personally try to avoid using JAXP within OSGi because of the
> unpredictablility when it interacts between bundles.
>
> It may work for a while, and then it just goes nuts one day.
>
> Dave
>
>
> karen moore wrote:
>> The org.eclipse.jst.jee.util.internal.XmlRootHandler uses
>>            SAXParserFactory factory = SAXParserFactory.newInstance();
>>
>> while the org.eclipse.core.internal.content.XmlRootHandler uses
>>        Activator.getDefault().getFactory()    (our JPT copy uses this
>> as well)
>>
>> Will changing our JPT copy to use the former fix this problem?  And
>> if so I don't understand why the problem suddenly cropped up. I
>> apologize if I seem clueless about this, it's because I am :)
>>
>> Thanks,
>> Karen
>>
>> On 6/30/2009 11:40 AM, karen moore wrote:
>>> I copied XmlRootHandler from
>>> org.eclipse.core.internal.content.XmlRootHandler and that class has
>>> not changed since 2008.  Not really sure how that could have
>>> suddenly caused this problem.
>>>
>>> Karen
>>>
>>> On 6/30/2009 11:34 AM, David Carver wrote:
>>>> How ever your orm content type is being set up, and where you are
>>>> getting your XML parser is causing the issue.   The WTP parser is
>>>> setup to be an XInclude aware configuration.  You can't cast
>>>> between these to configurations.
>>>>
>>>> I'd check to see how your SAX based parsing and content resolver
>>>> are being setup and configured when calling Xerces.  Particularly
>>>> check your createParser code.
>>>>
>>>> Dave
>>>>
>>>> karen moore wrote:
>>>>> JPT has a bunch of test failures in last night's build and I am
>>>>> unsure of the cause.  We did release, but I am confused by the
>>>>> exception (see below) appearing in the log file that are
>>>>> preventing our xml content types from being loaded.  I updated my
>>>>> target workspace to last night's build and do not have test
>>>>> failures. Any ideas would be appreciated.
>>>>>
>>>>> Thanks,
>>>>> Karen
>>>>>
>>>>> !MESSAGE Could not create content describer for
>>>>> org.eclipse.jpt.core.content.orm. Content type has been disabled.
>>>>> !STACK 0
>>>>> java.lang.ClassCastException:
>>>>> org.apache.xerces.parsers.XIncludeAwareParserConfiguration
>>>>> incompatible with org.apache.xerces.xni.parser.XMLParserConfiguration
>>>>>     at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source)
>>>>>     at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source)
>>>>>     at
>>>>> org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.<init>(Unknown
>>>>> Source)
>>>>>     at org.apache.xerces.jaxp.SAXParserImpl.<init>(Unknown Source)
>>>>>     at
>>>>> org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(Unknown
>>>>> Source)
>>>>>     at
>>>>> org.eclipse.jpt.core.internal.resource.xml.XMLRootHandler.createParser(XMLRootHandler.java:118)
>>>>>
>>>>>     at
>>>>> org.eclipse.jpt.core.internal.resource.xml.XMLRootHandler.parseContents(XMLRootHandler.java:186)
>>>>>
>>>>>     at
>>>>> org.eclipse.jpt.core.internal.resource.xml.XMLRootElementContentDescriber.checkCriteria(XMLRootElementContentDescriber.java:169)
>>>>>
>>>>>     at
>>>>> org.eclipse.jpt.core.internal.resource.xml.XMLRootElementContentDescriber.describe(XMLRootElementContentDescriber.java:204)
>>>>>
>>>>>     at
>>>>> org.eclipse.core.internal.content.ContentType.describe(ContentType.java:161)
>>>>>
>>>>>     at
>>>>> org.eclipse.core.internal.content.ContentTypeCatalog.collectMatchingByContents(ContentTypeCatalog.java:189)
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
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