Here is a Colombo mystery I am wrestling with, called the case of the unrecognized Parser jar. Please forgive me if this got sent twice, since I was unsure of the first email See if you have any insights. 1. On windows 2000, I get this message when running Resin or Tomcat (Since their lists ofter no clues, I thought I would tap the Orion experts). Error: 500 Internal Servlet Error: javax.servlet.ServletException: org/xml/sax/EntityResolver 2. If I look at my classpath, I have Parser.jar in it. (http://localhost:8080/JSP page entry) CLASSPATH=.;d:\javaprograms\javasource;c:\jdk1.3\lib\mail.jar;c:\jdk1.3\lib\acti vation.jar;D:\javajdbcs\jdbc1\mm.mysql.jdbc-1.2c;C:\jdk1.3\lib\tools.jar;D:\Java ServletProducts\JbossData\addressbook;D:\JavaServletProducts\JbossData\addressbo ok\src\java;D:\javajarfiles\ejb.jar;D:\javajarfiles\servlet.jar;D:\javajarfiles\ server.jar\jboss-client.jar;D:\javajarfiles;D:\javajarfiles\jnp-client.jar;D:\Ja vaServletProducts\JbossData\addressbook\src\java\addressbook;D:\javajarfiles\add ressbook-client.jar;D:\javajarfiles\jndi.properties;D:\javajarfiles\Parser.jar;C :\j2sdkee1.2.1\lib\j2ee.jar;d:\javaservletproducts\orionapp\classes 3. If I examine the Parser.jar command with jar tf Parser.jar, then this is part of my jar file: org/xml/sax/EntityResolver.class So if the Java Columbo were looking at this case, what wisdom would they add that I am missing?