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copied!<p>The following code performs validation as per your need, <strong>and also tells you the line number where the error occurred during parsing</strong> You will need following jars to run this code</p> <p>Only code change needed is at validateSchema() method where request response args need to be replaced with a string representation of your xml and String representation of your XSD.</p> <p>resolver.jar, xml-apis.jar, serializer.jar, xercesImpl.jar</p> <pre><code>import org.apache.xerces.parsers.SAXParser; import org.apache.xerces.xni.Augmentations; import org.apache.xerces.xni.NamespaceContext; import org.apache.xerces.xni.XMLLocator; import org.apache.xerces.xni.XNIException; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import org.xml.sax.helpers.DefaultHandler; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Performs validation on XML based on the XSD. Overrides the * {@link SAXParser}. * * */ public class ValidateSchema extends SAXParser { /** * Container for current line and coloum number being parsed in the XML. */ private XMLLocator locator; /** * Default public constructor. */ public ValidateSchema() { super(); } /** * Used for obtaining the {@link XMLLocator} locator object. */ @Override public void startDocument( XMLLocator locator, String encoding, NamespaceContext namespaceContext, Augmentations augs) throws XNIException { this.locator = locator; super.startDocument(locator, encoding, namespaceContext, augs); } /** * Validates the XML against the provided XSD. * * @param req HttpServletRequest object. * @param resp HttpServletResponse object. * @throws IOException */ public void validateSchema(HttpServletRequest req, HttpServletResponse resp) throws IOException { String content = req.getParameter("data"); String selectbox = req.getParameter("selectbox"); content = content.trim(); // Convert the XML string to byte stream. InputStream is = new ByteArrayInputStream(content.getBytes()); try { this.setFeature(Constants.VALIDATION_PROP, true); this.setFeature(Constants.SCHEMA_PROP, true); this.setFeature(Constants.DYNAMIC_PROP, true); this.setFeature(Constants.SCHEMA_CHECKING_PROP, true); if("1".equalsIgnoreCase(selectbox)) { this.setProperty(Constants.SCHEMA_LOC,"oem.xsd" ); } else if("2".equalsIgnoreCase(selectbox)) { this.setProperty(Constants.SCHEMA_LOC,"carrier.xsd" ); } Validator handler = new Validator(); this.setErrorHandler(handler); InputSource isp = new InputSource(); isp.setByteStream(is); isp.setEncoding("UTF-8"); this.parse(isp); if (handler.validationError == true) { StringBuffer errorMessage = new StringBuffer(512); errorMessage .append("<div style='background: #ffebe6;border: 0px solid #ffe0d7;color:#c10000;height:60px;padding: 5px;'>") .append(Constants.INVALID_XML_DOCUMENT) .append(" LineNo: ") .append(handler.saxParseException.getLineNumber()) .append(" ColumnNo: ") .append(handler.saxParseException.getColumnNumber()) .append("<br/>") .append(handler.validationError) .append(handler.saxParseException.getMessage()) .append("</div>"); System.out.println( errorMessage ); } else { StringBuffer validMsg = new StringBuffer(512); validMsg.append("<div style='background: #ebeff9;border: 0px solid #6b90da;height:60px;padding: 5px;'>") .append(Constants.VALID_XML_DOCUMENT).append("</div>"); System.out.println( validMsg ); } } catch (SAXException e) { StringBuffer errorMessage = new StringBuffer(512); errorMessage .append("<div style='background: #ffebe6;border: 0px solid #ffe0d7;color:#c10000;height:60px;padding: 5px;'>") .append(Constants.INVALID_XML_DOCUMENT) .append(" LineNo: ") .append(this.locator.getLineNumber()) .append(" ColumnNo: ") .append(this.locator.getColumnNumber()) .append(" <br/>") .append(e.getMessage()) .append("</div>"); System.out.println( errorMessage ); } catch (Exception e) { StringBuffer errorMessage = new StringBuffer(512); errorMessage .append("<div style='background: #ffebe6;border: 1px solid #ffe0d7;color:#c10000;height:60px;padding: 5px;'>") .append(Constants.INVALID_XML_DOCUMENT) .append(" <br/>") .append(e.getMessage()) .append("</div>"); System.out.println( errorMessage ); } } /** * Writes back the response to client. * * @param msg Response message. * @param resp HttpServletResponse object. * @throws IOException */ private void responseWrite( String msg, HttpServletResponse resp) throws IOException { resp.setContentType("text/html"); resp.getWriter().write(msg); } /** * Custom handler for Errors while parsing documents. */ private class Validator extends DefaultHandler { public boolean validationError = false; public SAXParseException saxParseException = null; /** * @throws SAXException */ @Override public void error(SAXParseException exception) throws SAXException { validationError = true; saxParseException = exception; } /** * @throws SAXException */ @Override public void fatalError(SAXParseException exception) throws SAXException { validationError = true; saxParseException = exception; } /** * @throws SAXException */ @Override public void warning(SAXParseException exception) throws SAXException { } } } </code></pre> <p><strong>Constants.Java contains the validation properties that you need to specify</strong></p> <pre><code>public final class Constants { public static final String VALIDATION_PROP = "http://xml.org/sax/features/validation"; public static final String SCHEMA_PROP = "http://apache.org/xml/features/validation/schema"; public static final String DYNAMIC_PROP = "http://apache.org/xml/features/validation/dynamic"; public static final String SCHEMA_CHECKING_PROP = "http://apache.org/xml/features/validation/schema-full-checking"; public static final String SCHEMA_LOC = "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation"; public static final String VALID_XML_DOCUMENT = "The above XML is valid."; public static final String INVALID_XML_DOCUMENT = "The Document has error at:"; </code></pre> <p>}</p>

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