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Editorial Team
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Asked: 2026-05-17T19:11:25+00:00

I wrote next jsp: <html> <head> <meta http-equiv=Content-Type content=text/html; charset=UTF-8> <title>JSP Page</title> <link rel=stylesheet

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I wrote next jsp:

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
    <link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
    <h1>Monster Calculator</h1>
    <FORM METHOD="POST" ACTION="Controller">
        N1: <input type ="text" name="nr1" value="0">
        op: <input type ="text" name="op" value="+">
        N2: <input type ="text" name="nr2" value="0">
        <INPUT class ="button" TYPE="submit" NAME="actiune" VALUE="Calculate"/>
    </FORM>
    <jsp:useBean id="binaryOperation" class="beans.BinaryOperation" scope="session"/>
    <jsp:setProperty name="binaryOperation" property="*"/>
    Message: <jsp:getProperty name="binaryOperation" property="nr1"/>

</body>

Theproblem is that I expect that next line:

Message: <jsp:getProperty name="binaryOperation" property="nr1"/>

to display “Message: 0” at runtime.

This is the bean:

public class BinaryOperation {

private String nr1 = "";
private String op = "";
private String nr2 = "";

public void setNr1(String nr1) {
    this.nr1 = nr1;
}

public void setOp(String op) {
    this.op = op;
}

public void setNr2(String nr2) {
    this.nr2 = nr2;
}

public String getNr1() {
    return nr1;
}

public String getOp() {
    return op;
}

public String getNr2() {
    return nr2;
}

}

alt text

Where is the problem?

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1 Answer

  1. Editorial Team

    I’ve did one more jsp file between index.jsp and Servlet:

    <jsp:useBean id="binOp" class="beans.BinaryOperation" scope="session"/>
<jsp:setProperty name="binOp" property="*"/>

    This did the “magic”.

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