How to install servlet classes in order to compile a simple servlet...

When trying to compile a simple servlet (java file), I get errors having to do with not finding any object of the javax.servlet class. I am using J2SE v.1.4, and from what I know, it does not have built-in support for Servlets-JSP.
Do I need to install myself the servlet classes (downloaded from Sun's site) in order for my servlet to be able to compile and work under tomcat? And if so, where should I put them? Or is there something else I have to do?
Thank you in advance for your assistance!

If you have Tomcat already, the files you require are in:
(Tomcat4)
[TOMCAT_HOME]/common/lib/servlet.jar
or
(Tomcat5)
[TOMCAT_HOME]/common/lib/servlet-api.jar
[TOMCAT_HOME]/common/lib/jsp-api.jar
This file needs to be added to your classpath when compiling a servlet.

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Servlet - unable to compile my simple servlet

I downdloaded the servlet api, I changed the classpath to point to the directory that I extracted to. However, I still cannot compile a simple servlet. I am sure I did not install the servlet api the right way. Can somebody help?
Thanks

This may sound silly, but you did UNZIP the servlet API, right?
Where did you set the classpath? Through an environment variable? Through a command line?
Best,
brumalis

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Hi,
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Retrieve ServletContext from non-servlet class

A servlet calls a method which is located in another class which is not a servlet. Within this method of the non-servlet class, i need to access the ServletContext of the servlet that has called the method. What i am currently doing is simply passing the ServletContext as a parameter to the method.
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I am using WSAD 5.0. My servlet is acting as a controller but when when i m invoking the servlet from 2 JSPs , server is creating 2 objects for that servlet because of which i m not able to get the values which was set by the first servlet object..
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No.. its is invoked only once.
If an instance of the servlet does not exist, the Web container
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Creates an instance of the servlet class.
Initializes the servlet instance by calling the init method. Initialization is covered in Initializing a Servlet.
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Compile error for servlets

Hi
I have recently downloaded jakarta-tomcat3.3a and i'm trying to compile my simple servlets,but i have an error saying the
"import javax.servlet.*" not found and many more.
It seems to me that i'm missing servlet.jar file.
Now how do i set this.I'm sure it should be in classpath but i need to know where will i create my CLASSPATH variable,i mean to say is it in user variable or system variable.
I have already set my PATH in <control panel><system>environmental variable>USer variable>.
But i have not set any classpath till now as it was not necessary for me to run my java programs.
But now i think i have set the CLASSPATH.
I have my tomcat in C:\jakarta-tomcat-3.3a
Can anyone give me the exact path to set.
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The difference between System and User environment variables are simply who has access to them. When you set a System EV, it will persist regardless of the logged in user. User variables are specific only to that user. Which one you decide to set depends on which you really want.. but i believe User variables will override System variables.
Your classpath should then include..
c:\tomcat_install_dir\lib\servlet.jar

How to install servlet-2_3-fcs-classfiles.zip???

Hi!
I am using jdk1.3.1_02 and I try to compile a servlet source code. But I got error message
C:\tomcat\webapps\examples\WEB-INF\classes\HelloWorldExample.java:8: package javax.servlet does not exist
import javax.servlet.*;
^
I already unzip the contents of servlet-2_3-fcs-classfiles.zip in my jdk1.3.1_02 directory, but still it doesn't work. Anyone any ideas how to install it properly?

When you unzip the servlet, there should be a folder named javax, you can either move that folder to C:\jdk1.3.1_02 and compile the program normally (assuming that you have already defined a ckasspath that contains C:\jdk1.3.1_02). Or, you can add the path to your javax folder to the CLASSPATH environment variable.
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How can i make a servlet (class) temporarily unavailable, except for ADMIN

Hello All!
I am rather new to the programming field and have already completed a web-project in Java only with Servlets. (no jsp). I have a login procedure, means I have a user management for users and admins. If an admin is logged in, he/she should be able to deactivate the servlet with a mouse-click as long he activates it again with the same. if the servlet is deactivated, other users/admins trying to access the servlet should get a "servlet is currently unavailable" message. but the admin, who is logged in, still should be able to work with the servlet! how can i realise that?
in other words, by clicking that particular button, the servlet should be made "non-multi-thread" and other way round by activating it.
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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>
shortname
</servlet-name>
<servlet-class>
ClassName
</servlet-class>
</servlet>
</web-app>
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lisa

Ok,
You'll need to find a tutorial on servlet filters. Its not that hard a concept.
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/Servlets8.html#wp64572
Filters need to be configured in the web.xml.
Basically they are a buffer between a request and your servlet.
Any requests for the servlet, go through the filter first. It lets you do some processing before/after the servlet gets called. Its a good way of putting in some generic code that need to be run for many servlets - security checks are often implemented in this fashion.
This should give you an idea of the sort of thing you need. I haven't really written one before, so I copied this out of the tutorial and did some basic framework for it....
public final class TestFilter implements Filter {
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   public void destroy() {
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   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
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       // somehow you have to keep track of this ... maybe in the servletContext ?
    User user = (User) session.getAttribute("user")
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}

How to install oracle xsql servlet on bea weblogic 5.1

          Hi there,
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          in weblogic.properties I started with:
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          <!DOCTYPE web-app
          PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
          "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
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          <servlet>
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          <servlet-class>oracle.xml.xsql.XSQLServlet</servlet-class>
          </servlet>
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          <servlet-name>oracle-xsql-servlet</servlet-name>
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          </servlet-mapping>
          </web-app>
          So the xsql extension is mapped to the named servlet which is found in a jar file
          contained in subdirectory lib.
          The problem is that the general mapping of *.xsql extension to specified class
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          Application server just presents me with the content of the xsql file instead
          of executing servlet whith the xsql file as input.
          Any ideas??
          Thanx in advance.
          JK


What kind of problem do you have?
If it's not connected with JDBC, you'd better post your question
in webservices newsgroup.
Regards,
Slava Imeshev
"leopld goess" <[email protected]> wrote in message
news:[email protected]..
hy out there.
i've been working with apache soap on wl 5.1 for a while now, and
everything seems to be working allright- as long as i don't try to
install a servicepack, namely sp8 or sp10. if i do that, the entire
soap service fails to deploy.
any ideas...
thanx
leopold

How to publish a servlet class to web server?

background:
web server: tomcat apache 4
context path: webapp\test\
servlet path: webapp\test\WEB-INF
servlet name: HelloWorld.class
i tried to placed the servlet class file to above servlet path,
but i can't invoke the servlet by http://localhost:8080/test/HelloWorld
what should i do in order to invoke the servlet at browser?
Is a web.xml necessary a must to provided a mapping between request name and actual class name?

First of all you need a *.war structure which look like this
/app-name
/app-name/WEB-INF/
/app-name/WEB-INF/lib
/app-name/WEB-INF/classes
When you have created this structure you add your servlet (HelloWorld.class) in the classes directory (Create the package structure first).
When this is done you need to map the servlet to a given uri which is done in the web.xml. An example is found below:
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>package.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello/*</url-pattern>
</servlet-mapping>
Hopefully this will help :-)
best regards
Stig

How to access an external text file in a Servlet class?

I do the regular file I/O in the Servlet class. But when I run Servlet class, text file is not loaded. Can sb tell me how to do it?
Thanx
Richard

Hi DrClap;
the following is the main servlet code, which calls other two classes.
===================================================================
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class TermsServlet extends HttpServlet {
          public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
          resp.setContentType("text/html");
          PrintWriter out = resp.getWriter();
          out.println("<HTML>");
          out.println("<TITLE>Computer Terms and Acronyms</TITLE>");
          out.println("<BODY>");
          out.println("<H1>Computer Terms and Acronyms</H1>");
          out.println("<TABLE BORDER=2>");
          out.println("<TR><TH>Term<TH>Meaning</TR>");
          TermsAccessor tax = new TermsAccessor("terms.txt");
          Iterator e = tax.iterator();
          while (e.hasNext()) {
               Term t = (Term)e.next();
               out.print("<TR><TD>");
               out.print(t.term);
               out.print("<TD>");
               out.print(t.definition);
               out.println("</TR>");
          out.println("</TABLE>");
          out.println("<HR></HR>");
          out.println("</BODY></HTML>");
=================================================
import java.io.*;
import java.util.*;
public class TermsAccessor {
     protected BufferedReader is;
     protected String ident;
     public TermsAccessor(String inputFileName) throws IOException {
          is = new BufferedReader(new FileReader(inputFileName));
          String ident = is.readLine();
     public String getIdent() {
          return ident;
     public Iterator iterator() {
     return new Iterator() {
          String line, term, defn;
public boolean hasNext() {
          try {
          return ((line = is.readLine()) != null);
          } catch (IOException e) {
          System.err.println("IO Error: " + e);
          return false;
          public Object next() {
          int i;
          while ((i = line.indexOf("\t"))<0 && hasNext());
          if (line == null)
          throw new IllegalStateException("Invalid EOF state");
                    term = line.substring(0, i);
                    defn = line.substring(i+1);
                    return new Term(term, defn);
          public void remove() {
          throw new UnsupportedOperationException();
=============================================================
public class Term {
          public String term;
          public String definition;
          public Term(String t, String d) {
          term = t;
          definition = d;
=================================================================
part of [terms.txt] file as following:
$Id: terms.txt,v 1.5 2000/03/17 04:08:55 $
AMD     American Micro Devices: a chip maker that competes with Intel.
API     Application Programmer Interface: a set of functions that a programmer can use
ASP     Active Server Pages, a Microsoft technology for imbedding certain commands in HTML pages
BSD     Berkeley Software Distribution, one of the two major flavors of UNIX. See OpenBSD
C     A computer programming language invented for writing UNIX in, and very popular in the late 1970's through the 1990's
C++     An Object-Oriented language heavily based on C; recently displaced by Java
CGI     Common Gateway Interface; a script or program used to handle a form on a web page
COBOL     COmmon Business Oriented Language, a programming language used mainly for large-scale financial applications.
CPU     Central Processing Unit, the "chip" that gives a computer its low-level personality ("machine instruction set") and performs individual instructions (add, multiply, compare...). Common CPUs include Intel/AMD "PC", SPARC, Alpha.
=================================================================
the "terms.txt" file and above class files are under the same directory. I use J2EE server to deploy the file, after run, the erro mesage is:"The requested resource (terms.txt (The system cannot find the file specified)) is not available." That means server can not locate the terms.txt file. So what file path should I use?
Thanx
Richard

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