Cannot access a servlet from a Java application

[Alejandro Barrero]

I don't know how, but I solved the problem. I just re created the servlet from scratch adding one bit of functionality and one external jar at a time and lo and behold it worked. I swear I didn't change anything in the web.xml file. I apologize for the time I took from some of you.


I am trying to access a servlet from a Java application

	public static void main(String[] args) {
		HttpURLConnection connection = null;
		OutputStreamWriter wr = null;
		BufferedReader rd = null;
		StringBuilder sb = null;
		String line = null;
		URL serverAddress = null;
		try {
			serverAddress = new URL("http://localhost:8080/servlet/Paperless/");
			connection = null;
			connection = (HttpURLConnection) serverAddress.openConnection();
			connection.setRequestMethod("POST");
			connection.setDoOutput(true);
			connection.setReadTimeout(10000);
			connection.connect();
			rd = new BufferedReader(
					new InputStreamReader(connection.getInputStream()));
			sb = new StringBuilder();
			while ((line = rd.readLine()) != null) {
				System.out.println(line);
				sb.append(line + '\n');
			}
			System.out.println(sb.toString());
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (ProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			connection.disconnect();
			rd = null;
			sb = null;
			wr = null;
			connection = null;
		}
	}

In the server web.xml MyEclipse created

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <servlet>
  <description>This is the description of my J2EE component</description>
  <display-name>This is the display name of my J2EE component</display-name>
  <servlet-name>Paperless</servlet-name>
  <servlet-class>com.paperless.Paperless</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>Paperless</servlet-name>
  <url-pattern>/servlet/Paperless</url-pattern>
 </servlet-mapping>
 <login-config>
  <auth-method>BASIC</auth-method>
 </login-config>
</web-app>

I am getting the exception "java.io.FileNotFoundException: http://localhost:8080/PaperlessOfice/Paperless/".

[William Brogden]

1. Where is that error message appearing?
2. Why are you doing a POST but not sending a request body?

Bill

[Alejandro Barrero]

Thank you William. I am running the program in the MyEclipse debugger; the message comes in the console. I get the same error even if I send data in the request

			DataOutputStream out = new DataOutputStream( connection.getOutputStream() );
			out.writeBytes( "?x=0" ); // Or any string
			out.flush();
			out.close();			

I have Tomcat running; I can use

			serverAddress = new URL("http://localhost:8080/docs/");

and it works fine. Initially, the web application was created with index.jsp specified in the web.xml and my request was running the JSP; so Tomcat is running my war. I think that my client code is correct, but I have to do something in web.xml. In the client I have tried all combinations of PaperlessOffice, Paperless and servlet to no avail.

[Ben Souther]

Are you able to hit that component with a browser?
If so, then the web portion is OK, and the problem is in the client.

Likewise, you can test the client code by aiming it at URL that you know works.

[Alejandro Barrero]

I just don't getit.
I am using "serverAddress = new URL("http://localhost:8080/Paperless/servlet/Paperless/");" the idea is to invoke the url-pattern "servlet/Paperless" in the war file "Paperless".
I am using

 <servlet>
  <servlet-name>Paperless</servlet-name>
  <servlet-class>com.paperless.Paperless</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>Paperless</servlet-name>
  <url-pattern>/servlet/Paperless</url-pattern>
 </servlet-mapping>

in my web.xml file. It associates the url pattern "servlet/Paperless" with the name "Paperless". In the servlet tag this name is associated with class com.paperless.Paperless. This class exists in WEB-INF/classes. It should find this calls, but I am getting a 404 error in the tomcat log which tells me thta the resource is not found and In Java I get "java.io.FileNotFoundException: http://localhost:8080/Paperless/servlet/Paperless/".
When I use "serverAddress = new URL("http://localhost:8080/Paperless/" )"I get the text of the index.jsp file in <welcome-file> in web.xml, so "http://localhost:8080/Paperless/" is a web address (I should know that because 404 means that the request was received).
I am getting the same error with Tomcat and GlassFish. I don't know what I am doing wrong in the web.xml file. I really need the help of an expert.

[Ben Souther]

Have you looked at the logs to see if the servlet wasn't able to be deployed?

[Alejandro Barrero]

Thank you Ben. I haven't seen anything in the Tomcat or GlassFish logs. But on GlassFish I just saw "[#|2011-05-12T12:46:02.684-0400|INFO|oracle-glassfish3.1|javax.enterprise.system.tools.admin.org.glassfish.deployment.admin|_ThreadID=193;_ThreadName=Thread-1;|PaperlessOfice was successfully deployed in 316 milliseconds.|#]

".
But I am still having the same error with "serverAddress = new URL("http://localhost:8080/Paperless/paperless");". Using

 <servlet>
  <servlet-name>Paperless</servlet-name>
  <servlet-class>com.paperless.Paperless</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>Paperless</servlet-name>
  <url-pattern>/paperless</url-pattern>
 </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>