[jdom-interest] SAXBuilder.build(java.io.Reader characterStream) Error

[Kevin Baynes]

I've run into a problem building a JDOM document by passing a Reader into
the SAXBuilder (today's snapshot).

In the sample application included below, I can pass two direct subclasses
of java.io.Reader into the SAXBuilder.build(java.io.Reader characterStream)
method and get success  - BufferedReader and InputStreamReader.

However, when I try to pass the FileReader subclass of InputStreamReader, I
get a failure.

I even tried upcasting the FileReader to InputStreamReader and Reader, which
both fail.

I'm getting an error that appears to be similar to the EOF Socket error:
org.jdom.JDOMException: The root element is required in a well-formed
document.: Error on line 1: The root element is required in a well-formed
document.

It seems to me that if I can pass a two subclasses of Reader and get
success, that all the subclasses should work. (all subclasses should have
all features of superclass).

Am I wrong in this thought? Can you see some error I am making?

You can download the following files to check me:
ftp://ftpGuest:ftpGuest@hemlock.renex.com/RequestParser2.java
ftp://ftpGuest:ftpGuest@hemlock.renex.com/RequestParser2.class
ftp://ftpGuest:ftpGuest@hemlock.renex.com/trace.txt (pass this file to
RequestParser)

Pass through the file to parse as command line args: java RequestParser2
trace.txt

Thanks!

-Kevin Baynes
kbaynes at renex.com


Here is the file that will generate the errors:


import java.io.*;

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

import java.util.*;

public class RequestParser2 {

	public static void main(String[] args) {



		//if ( "Reader".equalsIgnoreCase(args[1]) )

		try {

			File theFile = new File(args[0]);
			FileReader file = new FileReader(theFile);
			BufferedReader buff = new BufferedReader(file);
			FileInputStream fis = new FileInputStream(new File(args[0]));
			InputStreamReader isr = new InputStreamReader(new FileInputStream(new
File(args[0])));

			SAXBuilder builder = new SAXBuilder();
			XMLOutputter fmt = new XMLOutputter();
			Document doc;
			int i;

			try {
				// build and output with FileInputStream
				System.out.println("\n\n******************\nbuild and output with
FileInputStream. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build(fis);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with BufferedReader
				System.out.println("\n\n******************\nbuild and output with
BufferedReader. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build(buff);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with FileReader
				System.out.println("\n\n******************\nbuild and output with
FileReader. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build( file);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with FileReader cast to Reader
				System.out.println("\n\n******************\nbuild and output with
FileReader cast to Reader. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build((java.io.Reader)file);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with FileReader cast to InputStreamReader
				System.out.println("\n\n******************\nbuild and output with
FileReader cast to InputStreamReader. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build((java.io.InputStreamReader)file);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with InputStreamReader
				System.out.println("\n\n******************\nbuild and output with
InputStreamReader. Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build( isr );
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

			try {
				// build and output with File
				System.out.println("\n\n******************\nbuild and output with File.
Ready? (hit 'Enter')");
				System.in.read();System.in.read();
				doc = builder.build(theFile);
				fmt.output(doc,System.out);
			} catch (Exception e) {
				e.printStackTrace();
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

} // end RequestParser2 class




Here is the file being parsed:

<?xml version="1.0"
encoding="UTF-8"?><WMREQUEST><ACTION>adminLogin</ACTION><PAYLOAD><LOGINID>ke
vin</LOGINID><PWORD>kegvin</PWORD></PAYLOAD></WMREQUEST>