Java applet outputting HTML

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1

I’m trying to create a simple HelloWorld applet and I’m running into problems getting it to work in Firefox 3.6. The Java Tester page (Java Tester - What Version of Java Are You Running?) says I’m running Java 1.6 and my Internet Explorer 8 doesn’t even show anything at all–just a blank image placeholder where the Java readout should be displayed. Weird thing is that my Java applet runs perfectly fine on Internet Explorer 8 but not on Firefox. :sick:

Would this have anything to do with the “set CLASSPATH=” part of using javac?

(I’m sorry, but I forgot to mention that I’m using Tomcat 7 to deliver these things on my Windows XP box.)

2

Can you post the html that you’re using to load the applet?

3

I think I messed-up with explaining what I’m trying to do here…

I have the following .java file located in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\webdev\WEB-INF\classes\sample:

package sample;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet{
	public void doGet(HttpServletRequest req, HttpServletResponse res)
		throws ServletException, IOException{
			res.setContentType("text/plain");
			PrintWriter out = res.getWriter();
			out.println("<html>");
			out.println("<head><title>Hello World!</title></head>");
			out.println("<body>");
			out.println("<h1>Hello World! Dude!</h1>");
			out.println("</body></html>");
	}
}

The Tomcat XML file being used in this is the following and found in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\webdev\WEB-INF:

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app 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_3_0.xsd" version="3.0">  

    <description>
      AppDev Class Example
    </description>
    <display-name>Hello World! Dude!</display-name>

    <servlet>
      <servlet-name>HelloWorld</servlet-name>
      <servlet-class>sample.HelloWorld</servlet-class>
    </servlet>
 
	<servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/HelloWorld</url-pattern>
    </servlet-mapping>


</web-app>

In the Apache Tomcat 7 Properties window (the “Configure Tomcat” tool that’s accessed from the Start / Programs / Apache Tomcat 7.0 directory), “Java Classpath” is set to: C:\Program Files\Apache Software Foundation\Tomcat 7.0\bin\bootstrap.jar;C:\Program Files\Apache Software Foundation\Tomcat 7.0\bin\ omcat-juli.jar

Unfortunately, my HelloWorld Java app wouldn’t compile correctly unless I used the j2ee.jar from the Sun directory: C:\Sun\SDK\lib

I’ve been trying to view my final .class file (after compiling it with javac) by going into Firefox and accessing the URL “[B]http://localhost:8888/webdev/HelloWorld[/B]” (I’ve had to set it to listen to 8888 due to other servers running on the system).

Inside the about:plugins with Firefox 3.6, there’s information about “Java™ Platform SE 6 U25” and “Java Deployment Toolkit 6.0.250.6”. They’re both enabled.

Whenever I try to access this final .class file through the browser (I refer to it as an applet–which is probably wrong) I get nothing but the markup within that Java file. However, when I try to access it inside of IE8, everything comes out great.

Sorry for any confusion. What’s going on here? Why doesn’t this work in Firefox?

4

Okay, just to clear this up, applets are a completely different animal, this is a servlet.

The fact that you’re getting the mark-up was the key, I see you’ve set the content type to text/plain, then turn around and send text/html.

Given MS’s track record of not following any standards known to mankind, it’s hardly a surprise that IE is a bit more lenient; conversely, FF takes the server’s word for it when it’s told that the response will be plain text and obediently displays the markup.

Change the content type to text/html (or omit it, I think html is the default) and it’ll work fine.

5

Nail on the head, rushiku. It’s working. Thanks!