Hi,

When I try to create an xpath object I get the following exception;

Exception in thread "main" java.lang.IllegalAccessError: tried to
access method net.sf.saxon.functions.SystemFunctionLibrary.<init>(I)V
from class net.sf.saxon.xpath.StandaloneContext
at
net.sf.saxon.xpath.StandaloneContext.<init>(StandaloneContext.java:75)
at net.sf.saxon.xpath.XPathEvaluator.<init>(XPathEvaluator.java:56)
at net.sf.saxon.xpath.XPathFactoryImpl.newXPath(XPathFactoryImpl.java:96)
at
com.bp.ist.tct.gops.gh.MessageValidator.XMLValidate(MessageValidator.java:147)
at com.bp.ist.tct.gops.gh.TestValidator.main(TestValidator.java:21)

Here is the function that it is ocuring in;

package com.bp.ist.tct.gops.gh;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.*;

import org.w3c.dom.;
import org.xml.sax.;

import javax.xml.parsers.*;

import javax.xml.namespace.NamespaceContext;

import net.sf.saxon.dom.;
import net.sf.saxon.xpath.;
import net.sf.saxon.instruct.*;
import net.sf.saxon.om.NamespaceConstant;

import com.ghc.ghTester.expressions.;
import javax.xml.xpath.;

public static String XMLValidate(String Source, String Target,String Criteria)
throws SAXException, ParserConfigurationException {

//System.setProperty("javax.xml.parsers.DocumentBuilderFactory",&quo
t;net.sf.saxon.om.DocumentBuilderFactoryImpl");

Boolean valid = true;
StringBuffer strResult = new StringBuffer();
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
builderFactory.setNamespaceAware(true);

DocumentBuilder builder = null;
builder = builderFactory.newDocumentBuilder();

Document sourceDocument = null;
Document targetDocument = null;

XPathFactory xpathFact;
try {
xpathFact = net.sf.saxon.xpath.XPathFactoryImpl.newInstance(NamespaceConstant.
OBJECT_MODEL_SAXON);
XPath xpath = xpathFact.newXPath();
xpath.setNamespaceContext(ctx);

try {
sourceDocument = builder.parse(new InputSource(new
ByteArrayInputStream(Source.getBytes())));
} catch (IOException e) {
e.printStackTrace();
}

try {
targetDocument = builder.parse(new InputSource(new
ByteArrayInputStream(Target.getBytes())));
} catch (IOException e) {
e.printStackTrace();
}

String paths = null;

if (Criteria.startsWith("\&quot;")) {
Criteria = Criteria.substring(1);
}

if (Criteria.endsWith("\&quot;")) {
Criteria = Criteria.substring(0, Criteria.length()-1);
}

paths = Criteria.split(",");

for (String path : paths) {

XPathExpression expr = null;

System.out.println("Checking Path->" + path);

try {
expr = xpath.compile(path);
} catch (XPathExpressionException e) {
e.printStackTrace();
}

String sourceValue = null;
net.sf.saxon.dom.NodeWrapper sourceNode;
try {
sourceNode = (net.sf.saxon.dom.NodeWrapper)expr.evaluate(sourceDocument,
XPathConstants.NODE);
sourceValue = sourceNode.getStringValue();

} catch (Exception e) {
sourceValue = "SOURCE ELEMENT NOT FOUND! " + e;
}

String targetValue = null;
Node targetNode;
try {
targetNode = (Node)expr.evaluate(targetDocument, XPathConstants.NODE);
targetValue = targetNode.getTextContent();

} catch (Exception e) {
targetValue = "TARGET ELEMENT NOT FOUND! " + e;
}

if (!sourceValue.equals(targetValue)) {

strResult.append("\nCritera -> " + path + "\n");
strResult.append("Source -> " + sourceValue + "\n");
strResult.append("Target -> " + targetValue + "\n");

valid = false;
}
}

} catch (XPathFactoryConfigurationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

return valid.toString().toUpperCase() + "\n" + strResult.toString();

}

I would appreciate any help you could give, thanks

I think the most likely explanation for this error is a classpath problem: you
are loading the saxon9-xpath.jar issued with a different version of Saxon from
the main saxon9.jar, and hence you have a problem when doing a method call
across the boundary between these Jar files.