JSP Errors in ForEach Loop

Question

I am using Spring MVC. I am making a dummy project in which I am taking categories of clothes from database using hibernate and add it to the modelAndView(add as list) attribute and send it to the view page. In view page I have to show the categories.But I am not able to get the value. Please my when the view page is getting called I am getting number format exception.

This is my controller code.

@RequestMapping(value = "/insproduct")
    public ModelAndView insertProduct(HttpServletResponse response)
            throws IOException {
        List<Catogories> cat = categories.selectCategories();
        ModelAndView mav = new ModelAndView("admin/insproduct");
        mav.addObject("cato", cat);
        return mav;

    }

The Controller call to my Jsp page. This is my jsp page.

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ page import="online.model.Catogories" %>
    <anyxmlelement xmlns:c="http://java.sun.com/jsp/jstl/core">
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <div style="text-align: center;">
    <div style="box-sizing: border-box; display: inline-block; width: auto; max-width: 480px; background-color: #FFFFFF; border: 2px solid #0361A8; border-radius: 5px; box-shadow: 0px 0px 8px #0361A8; margin: 50px auto auto;">
    <div style="background: #0361A8; border-radius: 5px 5px 0px 0px; padding: 15px;"><span style="font-family: verdana,arial; color: #D4D4D4; font-size: 1.00em; font-weight:bold;">ENTER THE PRODUCT</span></div>
    <div style="background: ; padding: 15px">
    <style type="text/css" scoped>
    <select style="background: ; padding: 15px">
<select style="text-align: left;">


    td { text-align:left; font-family: verdana,arial; color: #064073; font-size: 1.00em; }
    input { border: 1px solid #CCCCCC; border-radius: 5px; color: #666666; display: inline-block; font-size: 1.00em;  padding: 5px; width: 100%; }
    input[type="button"], input[type="reset"], input[type="submit"] { height: auto; width: auto; cursor: pointer; box-shadow: 0px 0px 5px #0361A8; float: right; margin-top: 10px; }

    table.center { margin-left:auto; margin-right:auto; }
    .error { font-family: verdana,arial; color: #D41313; font-size: 1.00em; }
    </style>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form name="input" action="demo_form_action.asp" method="get">
<br>
PRODUCT ID: <input type="text" name="product_id"><br>
PRODUCT NAME: <input type="text" name="product_name"><br>

PRODUCT BUY PRICE: <input type="text" name="product_buy_price"><br>
PRODUCT SELL PRICE: <input type="text" name="product_sell_price"><br>



 <c:forEach items="${cat}" var="cato">
    <tr>      
        <td>${cato.getCatogories_name}</td>
    </tr>
</c:forEach>






<br>
<input type="radio" name="sex" value="male">Male
<input type="radio" name="sex" value="female">Female
<br>

<input type="radio" name="age_group" value="adult">adult
<input type="radio" name="age_group" value="child">child
<br>

PRODUCT SIZE: <input type="text" name="product_detail_size"><br>
PRODUCT COLOR: <input type="text" name="pproduct_image"><br>
PRODUCT DISCOUNT: <input type="text" name="product_discount"><br>

<input type="button" value="ENTER" align="right"  width="48" height="48">

</form> 

</body>
</html>

This is my POJO class from which which I am getting values. Please help me.

package online.model;

import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
@Entity
@Table(name="product_catogories")
public class Catogories {
    @Id
    private int catogories_id;

    @Column(name="catogories_name")
    private String catogories_name;


    @ManyToMany(mappedBy = "catogories")
    private Set<Product> products;

    public Set<Product> getProducts() {
        return products;
    }
    public void setProducts(Set<Product> products) {
        this.products = products;
    }
    public int getCatogories_id() {
        return catogories_id;
    }
    public void setCatogories_id(int catogories_id) {
        this.catogories_id = catogories_id;
    }
    public String getCatogories_name() {
        return catogories_name;
    }
    public void setCatogories_name(String catogories_name) {
        this.catogories_name = catogories_name;
    }


}

This is my DAO Class Implementation

package online.deo;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import online.model.Catogories;
import online.services.CategoriesServices;

@Transactional
@Repository
@Component
public class CategoriesServicesImpls implements CategoriesServices {
    CategoriesServicesImpls() {
    }

    @Autowired
    private SessionFactory sessionFactory;

    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public int insertCategories() {
        return 0;

    }

    @Override
    public int updateCategories() {
        return 0;

    }

    @Override
    public int deleteCategories() {
        return 0;

    }

    @Override
    @Transactional(readOnly = true)
    public List<Catogories> selectCategories() {

        Session session =   sessionFactory.openSession();
        Transaction transaction  = session.beginTransaction();
        Query query = session.createQuery("from Catogories");

        return query.list();

    }

}

And this is what I am getting error. I have trying to under the error but It is only giving that I have numberformat exception.I dont know by it is giving the error

Stacktrace:] with root cause
java.lang.NumberFormatException: For input string: "getCatogories_name"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:492)
    at java.lang.Integer.parseInt(Integer.java:527)
    at javax.el.ListELResolver.coerce(ListELResolver.java:163)
    at javax.el.ListELResolver.getValue(ListELResolver.java:51)
    at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:967)
    at org.apache.jsp.WEB_002dINF.jsp.admin.insproduct_jsp._jspService(insproduct_jsp.java:104)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

Thanks for help.and I am also getting confused in using foreach loop in jstl.

Hey I have updated my question.you @zerocool you can see my Error Stack — Manoj Singh, Sep 09 '14 at 08:53

score 1 · Answer 1 · edited Sep 09 '14 at 12:15

1

Since cat is a collection of list, when you do ${cato.getCatogories_name}, expression language tries to manipulate getCatogories_name as a number(index in the list ie cato[]) hence it tries to parse getCatogories_name name as a number and you end up with NumberFormatException.

How about iterating over the list by using c:out?

<c:forEach items="${cato}" var="cat" varStatus="status">

<c:out value="${cato[status.index].catogories_name}" />

</c:forEach>

edited Sep 09 '14 at 12:15

Manoj Singh

1,329
2
13
24

answered Sep 09 '14 at 09:15

ajay.patel

1,957
12
15

"${cato.catogories_name}" – Pankaj Sharma Sep 09 '14 at 11:19
Hey friends I found out the soultion. – Manoj Singh Sep 09 '14 at 12:08

score 0 · Answer 2 · edited May 23 '17 at 12:12

The name of the variable in request scope is cato:

mav.addObject("cato", cat);

where as you are using this name as cat in forEach loop

<c:forEach items="${cat}"

Also as per Unified Expression Language you have to access the property of your bean using syntax bean.propertyName instead of bean.methodName

So, try using this code and see if it fixes the issue:

 <c:forEach items="${cato}" var="cat">
    <tr>      
        <td>${cat.catogories_name}</td>
    </tr>
</c:forEach>

And finally the reason for the error is: In request scope cato is of type java.util.List so you can access an element at a given index (which should be number) by using cato.indexValue or cato[indexValue] where indexValue is a number.

So the JSP tags assumed you are passing an index and tried to convert getCatogories_name to a number and then it faced NumberFormatException. See this link for more details: Custom list + JSP + java.lang.NumberFormatException

score 0 · Answer 3 · answered Sep 09 '14 at 09:24

when using JSTL to iterate your object. you can directly access its field, and make sure that the key in your modelandview is the same with your items or EL

you put a cat object with cato key here

mav.addObject("cato", cat);

and you use ${cat} which i assume not existing.

 <c:forEach items="${cat}" var="cato">
    <tr>      
              // you are calling the method but you can call the field directly
        <td>${cato.getCatogories_name}</td>
    </tr>
</c:forEach>

change to

<c:forEach items="${cato}" var="cato">
    <tr>      
        <td>${cato.catogories_name}</td>
    </tr>
</c:forEach>

score 0 · Answer 4 · answered Sep 09 '14 at 09:49

0

You may try in your jsp:

<c:forEach items="${cato}" var="c">
    <tr><td>${c.catogories_name}</td></tr>
</c:forEach>

answered Sep 09 '14 at 09:49

JSP Errors in ForEach Loop

4 Answers4

Linked