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
