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Posted to user@karaf.apache.org by brock samson <br...@hotmail.com> on 2021/03/02 03:33:05 UTC

Re: Karaf 4.2.10 - NullPointerException during xml parsing

hi, JB. did you get a chance to run my bundle?

________________________________
From: brock samson <br...@hotmail.com>
Sent: Wednesday, February 24, 2021, 11:18 PM
To: user@karaf.apache.org
Subject: Re: Karaf 4.2.10 - NullPointerException during xml parsing

hi, JB.

thank you for looking at this. The attached zip (rename its extension from .txt to .zip) contains both the bundle (rename its extension from .txt to .jar) and its feature file. the bundle should be placed in the /bundles dir, and you know what to do with the feature file =)
here are some points regarding the bundle:
1) the bundle executes automatically during Karaf startup to make it easier for you.
2) The bundle contains both the schema and the xml, so you dont have to really do anything to the bundle itself in order for it to just run
3) The bundle contains props.properties where you can specify external locations to both schema and xml file if you choose to do so for any reason. The provided files will be ignored in such case.
4) I have also provided the source .java alongside the binary just in case.

again, really appreciate you taking the time to look at it. thanks!!!

Brock Samson

________________________________
From: Jean-Baptiste Onofre <jb...@nanthrax.net>
Sent: Tuesday, February 23, 2021 11:56 AM
To: user@karaf.apache.org <us...@karaf.apache.org>
Subject: Re: Karaf 4.2.10 - NullPointerException during xml parsing

Hi Brock,

Maybe you have xerces installed as bundle in your distribution ?

It sounds like a version mismatch.

Can you share the bundles installed ?

Thanks,
Regards
JB

Le 23 févr. 2021 à 16:55, brock samson <br...@hotmail.com>> a écrit :

Hello,

I am using Karaf 4.2.10 and attempting to perform a rather simple xml parsing:

Caused by: java.lang.NullPointerException
                at org.apache.xerces.util.ErrorHandlerProxy.error(Unknown Source) ~[!/:?]
                at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:137) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1900) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:740) ~[?:1.8.0_102]
                at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:570) ~[?:1.8.0_102]
                at org.apache.xerces.jaxp.JAXPValidatorComponent$XNI2SAX.startElement(Unknown Source) ~[!/:?]
                at org.apache.xerces.jaxp.JAXPValidatorComponent.startElement(Unknown Source) ~[!/:?]
                at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source) ~[!/:?]
                at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source) ~[!/:?]
                at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) ~[!/:?]
                at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) ~[!/:?]
                at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) ~[!/:?]
                at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) ~[!/:?]
                at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) ~[!/:?]
                at org.apache.xerces.parsers.DOMParser.parse(Unknown Source) ~[!/:?]
                at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source) ~[!/:?]
                at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) ~[?:1.8.0_102]

After snooping around, I noticed a /container/lib/endorsed/org.apache.karaf.specs.java.xml-4.2.10.jar lib containing parser-related libs. My code executed successfully once I ran Karaf without this particular file, though I don’t feel right just pulling it out of Karaf blindly, as its absence creates a distinct possibility of unforeseen issues down the road.

Here are the only imports my bundle references in its manifest:
Import-Package: javax.xml.transform,javax.xml.transform.stream,org.xml.sax,javax.xml.parsers,javax.xml.validation
There are no entries under Bundle-Classpath

Lastly, here is the java code that performs the xml parsing:

            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = sf.newSchema(new StreamSource(new FileInputStream("<LOCATION-OF-THE-SCHEMA-FILE>")));
            factory.setNamespaceAware(true);
            factory.setSchema(schema);
            factory.setExpandEntityReferences(false);
            factory.setXIncludeAware(false);
            factory.setFeature("http://xml.org/sax/features/external-parameter-entities",false);
            factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd",false);
            factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
            factory.setFeature("http://xml.org/sax/features/external-general-entities",false);
            DocumentBuilder builder = factory.newDocumentBuilder();
            builder.setErrorHandler(null);
            byte[] fileContent = Files.readAllBytes(Paths.get("<LOCATION-OF-THE-XML-FILE-TO-BE-PARSED>"));
            InputStream inStream = new ByteArrayInputStream(fileContent);
Document doc = builder.parse(inStream);

Please advise me as to what I am doing wrong, as well as a possible solution. Thank you for your time!

Sincerely,

Brock Samson