Help with a compiling error

I'm trying to compile two scripts, one for a login and the second for the client itself, but theses are the errors I keep getting:

XMLParserServer.java:7: package org.apache.xerces.parsers does not exist

import org.apache.xerces.parsers.SAXParser;

^

MultiServer.java:26: cannot find symbol

symbol : class XmlWriter

location: class OneServer

private XmlWriter xmlwriter;

^

MultiServer.java:118: cannot find symbol

symbol : class XmlWriter

location: class OneServer

xmlwriter = new XmlWriter();

^

XMLParserServer.java:21: cannot find symbol

symbol : class SAXParser

location: class XMLParserServer

XMLReader parser = new SAXParser();

^

Note: * uses or overrides a deprecated API.

Note: Recompile with -Xlint:deprecation for details.

Note: Some input files use unchecked or unsafe operations.

Note: Recompile with -Xlint:unchecked for details.

4 errors

I'm new to Java so what should I do?

[1041 byte] By [Kazuma.Mikuraa] at [2007-10-2 20:43:50]