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import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
 
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
 
import org.w3c.dom.Document;
 
 
public class updater {
    public static void main(String[] args) throws IOException {
		try{
			DefaultHttpClient httpclient = ClientMaker();
			HttpGet get = new HttpGet("http://w...content-available-to-author-only...r.com/path/to/Version.xml");
			HttpResponse response = httpclient.execute(get);
			InputStream in = response.getEntity().getContent();
 
			DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = domFactory.newDocumentBuilder();
			Document doc = builder.parse(in);
 
			//Parse the Xml.
			XPathFactory factory = XPathFactory.newInstance();
			XPath xpath = factory.newXPath();
			XPathExpression expr = xpath.compile("//version/number/text()");
			String result = (String) expr.evaluate(doc, XPathConstants.STRING);
			System.out.println(result);
 
			File f = new File("C:\\Users\\Damien\\Documents\\Eclipse\\MyOutput\\bin\\Version.xml");
			in = new FileInputStream(f) ;
			doc = builder.parse(in);
			expr=xpath.compile("//version/number/text()");
			String result2 = (String) expr.evaluate(doc, XPathConstants.STRING);
			System.out.println(result2);
 
 
			if(Integer.parseInt(result) < Integer.parseInt(result2)){
				HttpGet get2 = new HttpGet("http://w...content-available-to-author-only...r.com/path/to/MyJar.jar"); 
				HttpResponse response2 = httpclient.execute(get2);
				InputStream in2 = response2.getEntity().getContent();
				File f2 = new File("C:\\Users\\Damien\\Documents\\Eclipse\\path\\to\\MyJar.jar");
				OutputStream fos = new FileOutputStream(f2);
				byte buf[] = new byte[1024];
				int len;
				while ((len = in2.read(buf)) > 0) {
					fos.write(buf, 0, len);
				}
				fos.close();
				in.close();
			}
			Process p = Runtime.getRuntime().exec("cmd.exe /C  javaw -jar C:\\Users\\Damien\\Documents\\Eclipse\\path\\to\\MyJar.jar");
			p.waitFor();
			p.destroy();
		}catch(Exception e){ e.printStackTrace(); }
 
 
	}
 
	public static DefaultHttpClient ClientMaker() {
		int connectiontimeout = 30000; // 1 second int sockettimeout = 1000;
		HttpParams httpparameters = new BasicHttpParams();
		HttpConnectionParams.setConnectionTimeout(httpparameters,
				connectiontimeout);
		HttpConnectionParams.setSoTimeout(httpparameters, connectiontimeout);
		DefaultHttpClient httpclient = new DefaultHttpClient(httpparameters);
		return httpclient;
	}
 
}
 

Main.java:25: class updater is public, should be declared in a file named updater.java
public class updater {
       ^
Main.java:15: package org.apache.http does not exist
import org.apache.http.HttpResponse;
                      ^
Main.java:16: package org.apache.http.client.methods does not exist
import org.apache.http.client.methods.HttpGet;
                                     ^
Main.java:17: package org.apache.http.impl.client does not exist
import org.apache.http.impl.client.DefaultHttpClient;
                                  ^
Main.java:18: package org.apache.http.params does not exist
import org.apache.http.params.BasicHttpParams;
                             ^
Main.java:19: package org.apache.http.params does not exist
import org.apache.http.params.HttpConnectionParams;
                             ^
Main.java:20: package org.apache.http.params does not exist
import org.apache.http.params.HttpParams;
                             ^
Main.java:74: cannot find symbol
symbol  : class DefaultHttpClient
location: class updater
	public static DefaultHttpClient ClientMaker() {
	              ^
Main.java:28: cannot find symbol
symbol  : class DefaultHttpClient
location: class updater
			DefaultHttpClient httpclient = ClientMaker();
			^
Main.java:29: cannot find symbol
symbol  : class HttpGet
location: class updater
			HttpGet get = new HttpGet("http://www.myserver.com/path/to/Version.xml");
			^
Main.java:29: cannot find symbol
symbol  : class HttpGet
location: class updater
			HttpGet get = new HttpGet("http://www.myserver.com/path/to/Version.xml");
			                  ^
Main.java:30: cannot find symbol
symbol  : class HttpResponse
location: class updater
			HttpResponse response = httpclient.execute(get);
			^
Main.java:53: cannot find symbol
symbol  : class HttpGet
location: class updater
				HttpGet get2 = new HttpGet("http://www.myserver.com/path/to/MyJar.jar"); 
				^
Main.java:53: cannot find symbol
symbol  : class HttpGet
location: class updater
				HttpGet get2 = new HttpGet("http://www.myserver.com/path/to/MyJar.jar"); 
				                   ^
Main.java:54: cannot find symbol
symbol  : class HttpResponse
location: class updater
				HttpResponse response2 = httpclient.execute(get2);
				^
Main.java:76: cannot find symbol
symbol  : class HttpParams
location: class updater
		HttpParams httpparameters = new BasicHttpParams();
		^
Main.java:76: cannot find symbol
symbol  : class BasicHttpParams
location: class updater
		HttpParams httpparameters = new BasicHttpParams();
		                                ^
Main.java:77: cannot find symbol
symbol  : variable HttpConnectionParams
location: class updater
		HttpConnectionParams.setConnectionTimeout(httpparameters,
		^
Main.java:79: cannot find symbol
symbol  : variable HttpConnectionParams
location: class updater
		HttpConnectionParams.setSoTimeout(httpparameters, connectiontimeout);
		^
Main.java:80: cannot find symbol
symbol  : class DefaultHttpClient
location: class updater
		DefaultHttpClient httpclient = new DefaultHttpClient(httpparameters);
		^
Main.java:80: cannot find symbol
symbol  : class DefaultHttpClient
location: class updater
		DefaultHttpClient httpclient = new DefaultHttpClient(httpparameters);
		                                   ^
21 errors

Standard output is empty