Calling servlet from a JSP page's form action

Question

I'm trying to pass a value input to a textbox in a JSP page to a servlet that will store the value as a variable. But when I click the submit button the servlet isn't found. I get an error stating the requested resource is not available

Servlet Class:

    //parse input from hello.jsp input box 
    //and assign to fibNum variable
    
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        
        
        
    }
    

}

I've looked at some questions like this: <form action="/sampleServlet" giving me exception but changing the path didn't change the outcome.

Does anyone know how to fix this problem calling of a servlet? Or is there a step I'm missing in linking up the servlet?

res

package

Also this is the structure of my project tree:

@Reimeus just updated the question to include the ``wem.xml`. Could this issue be because there has to be a reference to the servlet in this file? — Brian Var, Dec 09 '14 at 01:16

score 1 · Accepted Answer · edited May 23 '17 at 11:50

1

You need to create servlet mapping in your web.xml. See here as well. So in your web.xml define;

<servlet>
  <servlet-name>hello</servlet-name>
  <servlet-class><package name>.HelloServlet</servlet-class>
</servlet>

Then create mappings (url patterns) for the servlet.

<servlet-mapping>
  <servlet-name>hello</servlet-name>
  <url-pattern>/say_hello/*</url-pattern>
</servlet-mapping>

Now in your JSP refernce the servlet like

 <form action="say_hello" method="get">            
   <b>Fibonacci Sequence Length </b>  <br>
   <input type="text" name="fibNum"size="20px" style="font-size:30pt;height:60px" >
   <input type="submit" value="submit" style="font-size:30pt;height:60px" > <br>  
   Value [1-100]<br>
 </form>

edited May 23 '17 at 11:50

Community

1
1

answered Dec 09 '14 at 01:19

Jerome Anthony

7,823
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31

I tired the above but it seems there is a problem with on one of the tags at the line: `.HelloServlet`. The error I'm geting is `Attribute name "name" associated with an element type "package" must be followed by the ' = ' character.` – Brian Var Dec 09 '14 at 14:56
I also had to change the form action to `post` to match the servlet. – Brian Var Dec 09 '14 at 18:57
The above solution worked, just had to correct the mappings as pointed out, How could I pass an integer array to the jsp page instead of just an integer value? I was thinking something like this:`resp.sendRedirect(("result.jsp?fibSeq=" + fibSeq));` but then I get the eeror: `fibSeq cannot be resolved to a variable` I'm guessing there is a different method involved for passing an array? The integer array is declared like `int[] fibSequence` – Brian Var Dec 10 '14 at 22:48

score 1 · Answer 2 · answered Dec 09 '14 at 04:11

1

you have to pass the servlet name same as your url_pattern(web.xml) to action tag of form.

answered Dec 09 '14 at 04:11

Sanjay

2,481
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score 1 · Answer 3 · answered Dec 09 '14 at 04:35

1

you have to do mapping in web.xml with url pattern - HelloServlet.

answered Dec 09 '14 at 04:35

Rajasekhar

787
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score 1 · Answer 4 · answered Dec 09 '14 at 05:25

I think in your code you just missed out some servlet declaration in web.xml file

<servlet>
   <servlet-name>...</servlet-name>
   <servlet-class>...</servlet-class>
</servlet>

<servlet-mapping>
   <servlet-name>...</servlet-name>
   <url-pattern>...</url-pattern>
</servlet-mapping>

score 0 · Answer 5 · answered Jan 10 '22 at 20:57

0

Final Solution: Tomcat 10 has problem please remove. download tomcat 9 from https://tomcat.apache.org/download-90.cgi.

I tried in Eclipse and Intellij with Tomcat 9 it works but the same code with Tomcat 10 has problem.

answered Jan 10 '22 at 20:57

Ashraf Gardizy

357
4
9

Calling servlet from a JSP page's form action

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