Integer vs. String

[Marko Debac]

Hi,
I have a problem with displaying a number which I has inserted through HTML input

<input type="text" name="in_sand" />
<input type="submit" name="Submit" value="Submit" class="buttonSubmit"/>
 

<c:if test="${param.submitted}">  
<c:set value="${param.in_sand}" var="in_sand" scope="request" />
<%
int number =(int) Integer.parseInt(request.getParameter("in_sand"));     // something is wrong here
 
out.println(number);
%>
</c:if>

Does somebody know why or how?

regardes,
Marko

[Marko Debac]

addition:

when I input String on same whay its ok:

<input type="text" name="name" />
 
<c:set value="${param.name}" var="name" scope="request" />
 
<% String person = (String) request.getParameter("name");
out.println(person);
%>

but on number, everything colapse

regardes,
Marko

[Bear Bibeault]

I'm really confused as to what you are trying to accomplish.

Firstly, you are mixing JSTL, EL and scriptlets? Why the scriplets?

Secondly, you are trying to obtain request params in the same page as defines the form. In this case, the form hasn't even been displayed yet, so how can it have been submitted in order to generate the request params?

[Marko Debac]

Hi Bear,
I am doing some web services, and I am calling operation within jsp, and I passing her a input var, and proceding output of operation on the next page.jsp, so it is a problem - I must mix

But this is very little mixing , and it must be done.

<%  try { getServiceSEIPort().operation(int parameter, String parameter));    }
 catch(java.rmi.RemoteException ex) {        // TODO handle remote exception    } catch(Exception ex) {        // TODO handle custom exceptions here    }    %> 

when I pass the String, it is ok

  String name = (String) request.getParameter("name");  

but when I need to pass int

 int idUser= (int) request.getParameter("id");  

but before
<%....%>
I have

<c:set value="${param.name}" var="name" scope="request" />
<c:set value="${param.id}" var="id" scope="request" />
 
<c:out value="${param.name}"/> //  this is for to see that I have
<c:out value="${param.id}"/>   //  right value, and I have, so its ok
 

so, I need to put those values into <%....%>, but String it accept, and on int, it colapse

And I cant get it,
please help,
regardes,
Marko

[Marko Debac]

I ment this that I have for printing out

 <c:out value="${name}"/> //  this is for to see that I have
 <c:out value="${id}"/>   //  right value, and I have, so its ok 

[Bear Bibeault]

  int idUser= (int) request.getParameter("id");     

The getParameter() method returns a String. Always.

Is this the way that you'd convert a string into an int in a Java program? Of course not. You can't cast a String to an int.

In an earlier code snippet you used Integer.parseInt(). Why did you stop using that?

[Marko Debac]

because it didnt work ,
so I ment that I am loosing track

Marko

[Marko Debac]

I tryed this to, end nothing

 String idUser= (String) request.getParameter("id_user");
     int idUser2 = String.parseInt(idUser);  

[Marko Debac]

 String idUser= (String) request.getParameter("id_user");
       int idUser2 = (int) Integer.parseInt(idUser);    

end this

[Ben Souther]

int idUser2 = (int) Integer.parseInt(idUser); 
--------------^

Integer.parseInt returns an int so there is no need for the cast.

[Bear Bibeault]

it didnt work

These are the three most useless words you could post on this forum. How did it not work?

[Marko Debac]

This is what I get with

 
String idUser= (String) request.getParameter("id_user");
int idUser2 = Integer.parseInt(idUser);

 exception 
 
org.apache.jasper.JasperException: java.lang.NumberFormatException: null
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:382)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:409)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:317)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
 

root cause 
 
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:415)
java.lang.Integer.parseInt(Integer.java:497)
org.apache.jsp.noviProfil_jsp._jspService(noviProfil_jsp.java:215)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:353)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:409)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:317)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
   

[Ben Souther]

org.apache.jasper.JasperException: java.lang.NumberFormatException: null

This is the exception that will be thrown if you try to convert a null to an int.
This means that no "id_user" parameter was sent to your page.

[Marko Debac]

but here I have it

<c:out value="${id_user}" />

and immidietly after this I have

<%String idUser= (String) request.getParameter("id_user");
int idUser2 = Integer.parseInt(idUser);
out.println(idUser2); %>   

It is wery odd

[Marko Debac]

I have figure out:
I will pass String parameter in web service operation, but on the server side I will do parsing before entering the database.

Thank you guys on the thinking with me,
Regardes,
Marko

[Paule Marcelle Ndjatsana Madjo]

Hi marko,
please can you show me how you figured it out?
Kind regards

[Campbell Ritchie]

Welcome to the Ranch

I am afraid this is a thread from 2006, and MD is unlikely to be around to give you an answer.
Please explain what your current problem is, and the rest of us can see what we can do.