Re: [Jaxen] New user puzzled about setting up a variable context

[Tony Montgomery-Smith]

StackTrace:

org.dom4j.XPathException: Exception occurred evaluting XPath:
/StateTable/State[
Name='Tender']/Action[InputEvent=$m]/ProcessFile. Exception: Variable :m
        at
org.dom4j.xpath.DefaultXPath.handleJaxenException(DefaultXPath.java:3
20)
        at org.dom4j.xpath.DefaultXPath.valueOf(DefaultXPath.java:172)
        at org.dom4j.tree.AbstractNode.valueOf(AbstractNode.java:193)
        at com.xslsystems.util.XPathEvaluator.go(XPathEvaluator.java:40)
        at com.xslsystems.util.XPathEvaluator.main(XPathEvaluator.java:18)

For completeness, here is my complete program:

package com.xslsystems.util;

import java.io.*;
import java.util.*;
import org.dom4j.*;
import org.dom4j.io.*;
import org.dom4j.xpath.*;
import org.jaxen.*;

public class XPathEvaluator
{
  public static void main(String[] args)
  {
    CommandLine cmd = new CommandLine(args);
    if (cmd.exists("file") && cmd.exists("expr"))
    {
      String para = cmd.exists("para") ? cmd.value("para") : "";
      (new XPathEvaluator()).go(cmd.value("file"), cmd.value("expr"), para);
    }
    else
      System.out.println(
        "Useage: XPath - file <xmlFileName> - expr <XPath expression>");
  }

  void go(String fileName, String expr, String para)
  {
    try
    {
      SAXReader reader = new SAXReader(false);
      Document doc = reader.read(fileName);
      XMLWriter out = new XMLWriter();
      out.write(doc);
      XPath xp = doc.createXPath(expr);
      SimpleVariableContext vc = new SimpleVariableContext();
      vc.setVariableValue("m",(Object) para);
      System.out.println("A " + para);
      xp.setVariableContext(vc);
      System.out.println("B "+
xp.getVariableContext().getVariableValue(null,null,"m"));
      System.out.println(doc.valueOf(xp.getText()));
    }
    catch (Exception e)
    {
      e.printStackTrace(System.out);
    }
  }
}

and the XML file:

<?xml version="1.0" encoding="UTF-8"?>
<StateTable>
 <State>
  <Name>Sale</Name>
  <Action>
   <InputEvent>ItemSale</InputEvent>
   <ProcessFile>ItemSale.xsl</ProcessFile>
  </Action>
  <Action>
   <InputEvent>Total</InputEvent>
   <ProcessFile>Total.xsl</ProcessFile>
   <NextState>Tender</NextState>
  </Action>
  <Action>
   <InputEvent>VoidTransaction</InputEvent>
   <ProcessFile>VoidTransaction.xsl</ProcessFile>
   <NextState>Sale</NextState>
  </Action>
 </State>
 <State>
  <Name>Tender</Name>
  <Action>
   <InputEvent>Cash</InputEvent>
   <ProcessFile>Cash.xsl</ProcessFile>
   <NextState>Tender</NextState>
   <NextState>Sale</NextState>
  </Action>
  <Action>
   <InputEvent>VoidTransaction</InputEvent>
   <ProcessFile>VoidTransaction.xsl</ProcessFile>
   <NextState>Sale</NextState>
  </Action>
 </State>
</StateTable>

All the jars came from the bdom4j-1.1.zip. I've tried putting the jaxen-core
and jaxen-dom4j jars from the Jaxen site ahead in the classpath, but that
doesn't change it.

Cheers

Tony


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