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javax.el.PropertyNotFoundException: Property 'codigoproduto' not found

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posted 5 months ago

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Hi, I have a getter and setter class but when I call this bean in my JSP to load records of MySql table to jtable I'm get an error that say that a item of my bean class not found, I can not see where are this error.
My bean:

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.itcsystems.beans;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Cezar Apulchro
 */
public class ProdutosBean extends HttpServlet
{
    private String  CodigoProduto,
                    DescricaoProduto,
                    PrecoProduto,
                    QuantidadeEstoque;

public ProdutosBean()
    {
        this.CodigoProduto = CodigoProduto;
        this.DescricaoProduto = DescricaoProduto;
        this.PrecoProduto = PrecoProduto;
        this.QuantidadeEstoque = QuantidadeEstoque;
    }
    /**
     * @return the CodigoProduto
     */
    public String getCodigoProduto()
    {
        return this.CodigoProduto;
    }

/**
     * @param CodigoProduto the CodigoProduto to set
     */
    public void setCodigoProduto(String CodigoProduto)
    {
        this.CodigoProduto = CodigoProduto;
    }

/**
     * @return the DescricaoProduto
     */
    public String getDescricaoProduto()
    {
        return this.DescricaoProduto;
    }

/**
     * @param DescricaoProduto the DescricaoProduto to set
     */
    public void setDescricaoProduto(String DescricaoProduto)
    {
        this.DescricaoProduto = DescricaoProduto;
    }

/**
     * @return the QuantidadeEstoque
     */
    public String getQuantidadeEstoque() {
        return this.QuantidadeEstoque;
    }

/**
     * @param QuantidadeEstoque the QuantidadeEstoque to set
     */
    public void setQuantidadeEstoque(String QuantidadeEstoque) {
        this.QuantidadeEstoque = QuantidadeEstoque;
    }

/**
     * @return the PrecoProduto
     */
    public String getPrecoProduto() {
        return this.PrecoProduto;
    }

/**
     * @param PrecoProduto the PrecoProduto to set
     */
    public void setPrecoProduto(String PrecoProduto) {
        this.PrecoProduto = PrecoProduto;
    }
    
    public String toString()
    {
        return "ProdutosBean{" +
                " CodigoProduto = " + this.CodigoProduto +
                ", DescricaoProduto = " + this.DescricaoProduto + 
                ", QuantidadeEstoque = " + this.QuantidadeEstoque +
                ", PrecoProduto = " + this.PrecoProduto + '}';
    }
    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Produtos_DAO_S01</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet Produtos_DAO_S01 at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

/**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

/**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

Log of error:

29-Oct-2020 20:21:03.121 SEVERE [http-nio-8084-exec-345] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [jsp] in context with path [/ITC_Systems_WEB_MVTC00] threw exception [An exception occurred processing JSP page /Gestao_Enfermaria_W001.jsp at line 607

604:                         <c:forEach var="tbproduto" items="${produtos}">
605:                             <tr id="produto">
606:                                 <td id="codigo" style="width: 50px;">
607:                                     <c:out value="${tbproduto.codigoproduto}" />
608:                                 </td>
609:                                 <td id="descricao" style="width: 175px;">
610:                                     <c:out value="${tbproduto.descricaoproduto}" />

Stacktrace:] with root cause
 javax.el.PropertyNotFoundException: Property 'codigoproduto' not found on type com.itcsystems.beans.ProdutosBean
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:268)
	at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:221)
	at javax.el.BeanELResolver.property(BeanELResolver.java:355)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:95)
	at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
	at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:943)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspx_meth_c_005fout_005f0(Gestao_005fEnfermaria_005fW001_jsp.java:908)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspx_meth_c_005fforEach_005f0(Gestao_005fEnfermaria_005fW001_jsp.java:868)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspService(Gestao_005fEnfermaria_005fW001_jsp.java:815)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

Thanks in advance.

Dave Tolls

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Posts: 4801

posted 5 months ago

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First off the naming for your instance variables should be camel case, so codigoProduto and not CodigoProduto.
You method names are correct, but the reference to the instance variables in your el needs to match the variable name...it is case sensitive.
So codigoProduto and not codigoproduto .
Same goes for descricaoproduto.

Technically speaking the instance variable could be called anything, as it's the getter that the el engine targets, but it helps to get the naming correct.

Cezar Apulchro

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Posts: 302

posted 5 months ago

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Problem still the same, now in 'descricaoproduto'.
Log error:

30-Oct-2020 08:21:54.977 GRAVE [http-nio-8081-exec-47] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [jsp] in context with path [/ITC_Systems_WEB_MVTC00] threw exception [An exception occurred processing [/Gestao_Enfermaria_W001.jsp] at line [586]

583:                                     <c:out value="${itemproduto.codigoproduto}" />
584:                                 </td>
585:                                 <td id="descricao" style="width: 175px;">
586:                                     <c:out value="${itemproduto.descricaoproduto}" />
587:                                 </td>
588:                             </tr>
589:                         </c:forEach>

Stacktrace:] with root cause
 javax.el.PropertyNotFoundException: Property [descricaoproduto] not found on type [com.itcsystems.beans.ProdutosBean]
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:260)
	at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:212)
	at javax.el.BeanELResolver.property(BeanELResolver.java:347)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:92)
	at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:113)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190)
	at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:702)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspx_meth_c_005fout_005f1(Gestao_005fEnfermaria_005fW001_jsp.java:994)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspx_meth_c_005fforEach_005f0(Gestao_005fEnfermaria_005fW001_jsp.java:930)
	at org.apache.jsp.Gestao_005fEnfermaria_005fW001_jsp._jspService(Gestao_005fEnfermaria_005fW001_jsp.java:796)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

Cezar Apulchro

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Posts: 302

posted 5 months ago

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Hi, problem is solved. I have created a new bean with string codigo, descricao, quantidade e preco, then alt+insert and generated the getter, setter and tostring. What I can't understan is why in the first post codigoproduto works fine and descricaoproduto don't work.
Thanks for all.

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