Re: How to import an external jar?

Nigel Wade <>
Mon, 28 Jan 2008 14:17:15 +0000
Momo wrote:

Hi every body
I'm new user in Java programming and when I compile a java program with
external jar....I get errors

What errors?

It always helps us to help you if you tells us the explicit error message. By
that I mean copy and paste the exact message, don't just describe it.

I will guess that the message you are getting here indicates that javac is
unable to find the requisite packages?

here is the code
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloServlet extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>Hello</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1>Hello</H1>\n" +

The javax packages are member of Tomcat server.

Yes. However, they are not part of the standard distribution so you need to tell
javac where to find them. How you do this depends on how you are developing
your Java code. If you are writing the code in a text editor and compiling at
the command line you need to use the -cp argument to javac to tell it where to
locate the relevant jars. If you are developing in an IDE then you need to tell
the IDE where to locate those jars, and how you do that depends on which IDE
you are using.

The jars will be located within the Tomcat installation, in the common/lib
directory. Netbeans has a servlet engine embedded so doesn't need to be told
anything, provided you create the correct type of Web application. Other IDEs
will need to be pointed to the jars.

Need help.....

So do we.

Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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