[JSP] I want execute a script only on click image

Hello.Is it possible to execute a script JSP, only if I click on a image.
Particulary i want to fill a field in a form only if I click on an image in the same page .jsp. In this field I should insert a name that I can recover like request.getParameter("name"); only if I click on image!!
Thanks in advance to anyone for any insight.

mmm. I can set a javaScript variable using JSP. How can I do?
I have this scenario in my web site. Page 1 have a form where I can insert an username. On submit Page2.jsp has the script jsp at issue(String usr=request.getParameter("username")). In the same page there is the field to fill with above mentioned username when I click on image.
So i could use usr to set a javaScript variable and onclick image I can set the field using JavaScript.
If it is possible, there is another problem:
All other people that access the page have to see the username of each other in the field(I need only two username).Using javaScript is not possible because JavaScript is client side.
Is it right? (Sorry if I am boring)

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<If the post was helpful mark as 'Helpful' and if the post answered your query, mark as 'Answered'>

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Ok.
Let's proceed surgically, else we'll never solve or overcome anything.
In the last your reply you wrote:
the normal output is what I get when the script runs successfully, the script first prints a few things
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The stuffs you spoke of are really performed?
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that let you think the script execution went alright, while instead it didn't.
In this case we have to investigate some other thing.
I can't still exclude that the problem isn't related with the buffer size of the stdout
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1. Exec.java
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4.Exec.c
#include "Exec.h"
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[JSP] I want execute a script only on click image

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