Exception de type java.lang.NumberFormatException

Bonjour, je suis nouveau en Java EE.

Je m’exerce sur une application web Java EE de gestion de stock à travers les différentes requête, d'insertion, de modification, de suppression, et de sélection.

Mais voila lorsque je traite la requête de modification dans ma servlet je rencontre un Exception du type : java.lang.NumberFormatException: null.

Ci-dessous vous verrai une copie du code de mes différentes classes et de ma jsp.

Bean Magasin :

Code:

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package com.bean;
 
public class Magasin {
 
    private Long idMagasin;
    private String nomMagasin, adresseMagasin, telephoneMagasin;
 
    public Long getIdMagasin() {
        return idMagasin;
    }
 
    public void setIdMagasin(Long idMagasin) {
        this.idMagasin = idMagasin;
    }
 
    public String getNomMagasin() {
        return nomMagasin;
    }
 
    public void setNomMagasin(String nomMagasin) {
        this.nomMagasin = nomMagasin;
    }
 
    public String getAdresseMagasin() {
        return adresseMagasin;
    }
 
    public void setAdresseMagasin(String adresseMagasin) {
        this.adresseMagasin = adresseMagasin;
    }
 
    public String getTelephoneMagasin() {
        return telephoneMagasin;
    }
 
    public void setTelephoneMagasin(String telephoneMagasin) {
        this.telephoneMagasin = telephoneMagasin;
    }
 
    @Override
    public String toString() {
        return "Magasin [idMagasin=" + idMagasin + ", nomMagasin=" + nomMagasin
                + ", adresseMagasin=" + adresseMagasin + ", telephoneMagasin="
                + telephoneMagasin + "]";
    }
}

DaoFactory :

Code:

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package com.dao;
 
import java.io.InputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
 
public class DaoFactory {
 
    private static final String FICHIER_PROPERTY = "/com/dao/dao.properties";
    private static final String PROPERTY_DRIVER = "driver";
    private static final String PROPERTY_URL = "url";
    private static final String PROPERTY_USERNAME = "username";
    private static final String PROPERTY_PASSWORD = "password";
 
    private String url;
    private String username;
    private String password;
 
    public DaoFactory(String url, String username, String password){
        this.url = url;
        this.username = username;
        this.password = password;
    }
 
    public static DaoFactory getInstance() throws DaoConfigurationException{
        Properties properties = new Properties();
        String driver;
        String url;
        String username;
        String password;
 
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        InputStream fichierProperties = classLoader.getResourceAsStream(FICHIER_PROPERTY);
 
        if(fichierProperties == null){
            throw new DaoConfigurationException("Le fichier contenant les paramètres de connexion "+FICHIER_PROPERTY+" est introuvable.");
        }
 
        try{
            properties.load(fichierProperties);
            driver = properties.getProperty(PROPERTY_DRIVER);
            url = properties.getProperty(PROPERTY_URL);
            username = properties.getProperty(PROPERTY_USERNAME);
            password = properties.getProperty(PROPERTY_PASSWORD);
        }catch(IOException e){
            throw new DaoConfigurationException("Echec de chargement des paramètres de connexion depuis le fichier "+FICHIER_PROPERTY, e.getCause());
        }
 
        try{
            Class.forName(driver);
        }catch(ClassNotFoundException e){
            throw new DaoConfigurationException("Echec de chargement des pilotes.", e.getCause());
        }
 
        DaoFactory instance = new DaoFactory(url, username, password);
 
        return instance;
    }
 
    Connection getConnection() throws SQLException{
        return DriverManager.getConnection(url, username, password);
    }
 
    public ProduitDao getProduitDao(){
        return new ProduitDaoImpl(this);
    }
 
    public FamilleProduitDao getFamilleProduitDao(){
        return new FamilleProduitDaoImpl(this);
    }
 
    public MagasinDao getMagasinDao(){
        return new MagasinDaoImpl(this);
    }
}

Interface MagasinDao :

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package com.dao;
 
import java.util.List;
 
import com.bean.Magasin;
 
public interface MagasinDao {
 
    void creerMagasin(Magasin magasin) throws DaoException;
 
    List<Magasin> selectionnerMagasin() throws DaoException;
 
    Magasin selectionnerMagasinParId(Long idMagasin) throws DaoException;
 
    void modifierMagasin(Magasin magasin) throws DaoException;
 
    void supprimerMagasin(Magasin magasin) throws DaoException;
}

MagasinDaoImpl (Classe implemantant l'interface MagasinDao) :

Code:

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package com.dao;
 
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
 
import com.bean.Magasin;
 
import static com.dao.DaoUtilitaires.*;
 
public class MagasinDaoImpl implements MagasinDao {
 
    private static final String SQL_DELETE_MAGASIN = "DELETE FROM magasin WHERE id_magasin = ?";
    private static final String SQL_INSERT_MAGASIN = "INSERT INTO magasin(nom_magasin, adresse_magasin, telephone_magasin) VALUES(?, ?, ?)";
    private static final String SQL_SELECT_MAGASIN = "SELECT * FROM magasin";
    private static final String SQL_SELECT_MAGASIN_PAR_ID = "SELECT * FROM magasin WHERE id_magasin = ?";
    private static final String SQL_UPDATE_MAGASIN = "UPDATE magasin SET nom_magasin = ?, adresse_magasin = ?, telephone_magasin = ? WHERE id_magasin = ?";
 
    private DaoFactory daoFactory;
 
    public MagasinDaoImpl(DaoFactory daoFactory){
        this.daoFactory = daoFactory;
    }
 
    public Magasin map(ResultSet resultSet) throws SQLException{
        Magasin magasin = new Magasin();
 
        magasin.setIdMagasin(resultSet.getLong("id_magasin"));
        magasin.setNomMagasin(resultSet.getString("nom_magasin"));
        magasin.setAdresseMagasin(resultSet.getString("adresse_magasin"));
        magasin.setTelephoneMagasin(resultSet.getString("telephone_magasin"));
 
        return magasin;
    }
 
    @Override
    public void creerMagasin(Magasin magasin) throws DaoException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet valeurAutoGeneree = null;
 
        try{
            connection = daoFactory.getConnection();
            preparedStatement = initialisationRequetePreparee(connection, SQL_INSERT_MAGASIN, true, magasin.getNomMagasin(), magasin.getAdresseMagasin(), magasin.getTelephoneMagasin());
            int statut = preparedStatement.executeUpdate();
 
            if(statut == 0){
                throw new DaoException("Echec d'insertion d'enregistrement dans la base.");
            }
 
            valeurAutoGeneree = preparedStatement.getGeneratedKeys();
 
            if(valeurAutoGeneree.next()){
                magasin.setIdMagasin(valeurAutoGeneree.getLong(1));
            }else{
                throw new DaoException("Echec de creation de valeur auto générée.");
            }
 
        }catch(SQLException e){
            throw new DaoException(e);
        }finally{
            fermetureSilencieuse(valeurAutoGeneree, preparedStatement, connection);
        }
    }
 
    @Override
    public List<Magasin> selectionnerMagasin() throws DaoException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        List<Magasin> listeMagasin = new ArrayList<Magasin>();
 
        try{
            connection = daoFactory.getConnection();
            preparedStatement = initialisationRequetePreparee(connection, SQL_SELECT_MAGASIN, false);
            resultSet = preparedStatement.executeQuery();
 
            while(resultSet.next()){
                listeMagasin.add(map(resultSet));
            }
 
        }catch(SQLException e){
            throw new DaoException(e);
        }finally{
            fermetureSilencieuse(resultSet, preparedStatement, connection);
        }
 
        return listeMagasin;
    }
 
    @Override
    public Magasin selectionnerMagasinParId(Long idMagasin) throws DaoException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        Magasin magasin = null;
 
        try{
            connection = daoFactory.getConnection();
            preparedStatement = initialisationRequetePreparee(connection, SQL_SELECT_MAGASIN_PAR_ID, false, idMagasin);
            resultSet = preparedStatement.executeQuery();
 
            if(resultSet.next()){
                magasin = map(resultSet);
            }
 
        }catch(SQLException e){
            throw new DaoException(e);
        }finally{
            fermetureSilencieuse(resultSet, preparedStatement, connection);
        }
 
        return magasin;
    }
 
    @Override
    public void modifierMagasin(Magasin magasin) throws DaoException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
 
        try{
            connection = daoFactory.getConnection();
            preparedStatement = initialisationRequetePreparee(connection, SQL_UPDATE_MAGASIN, true, magasin.getNomMagasin(), magasin.getAdresseMagasin(), magasin.getTelephoneMagasin(), magasin.getIdMagasin());
            int statut = preparedStatement.executeUpdate();
 
            if(statut == 0){
                throw new DaoException("Echec de modification de l'enregistrement.");
            }
 
        }catch(SQLException e){
            throw new DaoException(e);
        }finally{
            fermetureSilencieuse(preparedStatement, connection);
        }
 
    }
 
    @Override
    public void supprimerMagasin(Magasin magasin) throws DaoException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
 
        try{
            connection = daoFactory.getConnection();
            preparedStatement = initialisationRequetePreparee(connection, SQL_DELETE_MAGASIN, true, magasin.getIdMagasin());
            int statut = preparedStatement.executeUpdate();
 
            if(statut == 0){
                throw new DaoException("Echec de suppression de l'enregistrement.");
            }
 
        }catch(SQLException e){
            throw new DaoException(e);
        }finally{
            fermetureSilencieuse(preparedStatement, connection);
        }
    }
}

Classe ModifierMagasinForm :

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package com.servlet;
 
import java.io.IOException;
 
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
 
import com.bean.Magasin;
import com.dao.DaoFactory;
import com.dao.MagasinDao;
import com.form.ModifierMagasinForm;
 
public class ModifierMagasin extends HttpServlet {
 
    private static final String ATT_CONF_DAO_FACTORY = "daofactory";
    private static final String ATT_FORM = "form";
    private static final String ATT_MAGASIN = "magasin";
    private static final String PARAM_ID_MAGASIN = "idMagasin";
    private static final String VUE_MODIFIER_MAGASIN = "/WEB-INF/modifiermagasin.jsp";
 
    private MagasinDao magasinDao;
 
    public void init() throws ServletException{
        this.magasinDao = ((DaoFactory)getServletContext().getAttribute(ATT_CONF_DAO_FACTORY)).getMagasinDao();
    }
 
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 
        String valeurParametre = getValeurParametre(request, PARAM_ID_MAGASIN);
 
        Magasin magasin = magasinDao.selectionnerMagasinParId(Long.parseLong(valeurParametre));
 
        request.setAttribute(ATT_MAGASIN, magasin);
 
        this.getServletContext().getRequestDispatcher(VUE_MODIFIER_MAGASIN).forward(request, response);
    }
 
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 
        ModifierMagasinForm form = new ModifierMagasinForm(magasinDao);
        Magasin magasin = form.modifierMagasin(request);
 
        request.setAttribute(ATT_FORM, form);
        request.setAttribute(ATT_MAGASIN, magasin);
 
        this.getServletContext().getRequestDispatcher(VUE_MODIFIER_MAGASIN).forward(request, response);
    }
 
    private String getValeurParametre(HttpServletRequest request, String nomParametre){
        String valeurParametre = request.getParameter(nomParametre);
 
        if(valeurParametre == null || valeurParametre.trim().length() == 0){
            return null;
        }else{
            return valeurParametre.trim();
        }
    }
}

JSP listemagasin :

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<%@ page pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Liste des magasin</title>
        <link rel="stylesheet" type="text/css" href="<c:url value="/inc/style.css"/>"/>
    </head>
    <body>
        <div id="main">
            <%-- Entete de page --%>
            <div id="header">
              <div id="banner">
                <div id="welcome"><h1>Online Stock Application</h1></div>
                <div id="welcome_slogan"><h1>Always think big</h1></div>
              </div>
            </div>
 
            <%-- Barre de menu --%>
            <div id="menubar">
                <c:import url="/inc/menu.jsp"/>
            </div>
 
            <%-- Contenu de la page --%>
            <div id="site_content">
                <c:choose>
                    <c:when test="${empty listemagasin}"><c:out value="Pas de produit à afficher"/></c:when>
                    <c:otherwise>
                        <table border="1">
                            <tr>
                               <th style="width: 80px;">Code magasin</th>
                               <th style="width: 200px;">Nom</th>
                               <th style="width: 200px;">Adresse</th>
                               <th style="width: 180px;">Téléphone</th>
                               <th style="width: 100px;">Modifier</th>
                               <th style="width: 100px;">Supprimer</th>
                            </tr>
                                <c:forEach items="${listemagasin}" var="varListeMagasin" varStatus="double">
                                    <tr>
                                        <td>${varListeMagasin.idMagasin}</td>
                                        <td>${varListeMagasin.nomMagasin}</td>
                                        <td>${varListeMagasin.adresseMagasin}</td>
                                        <td>${varListeMagasin.telephoneMagasin}</td>
                                        <td><a href="<c:url value="modifiermagasin"><c:param name="idMagasin" value="${varListeMagasin.idMagasin}"/></c:url>">Modifier</a></td>
                                        <td><a href="<c:url value="supprimermagasin"><c:param name="idMagasin" value="${varListeMagasin.idMagasin}"/></c:url>">Supprimer</a></td>                                    
                                    </tr>                                                                    
                                </c:forEach>
                        </table>
                    </c:otherwise>
                </c:choose>
                <p style="margin: 10px 20px 0 0; float: right;"> | <a href="connection.jsp">Logout</a></p>
            </div>
 
            <%--Info pied de page --%>
            <div id="content_grey">
                <div class="content_grey_container_box">
                    <h4>Latest Blog Post</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <div class="content_grey_container_box">
                    <h4>Latest News</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <div class="content_grey_container_boxl">
                    <h4>Latest Projects</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <br style="clear:both"/>
 
            </div>
 
        </div>
 
        <%-- Pied de page --%>
        <div id="footer">
            <a href="#">Valid XHTML</a> | <a href="#">Valid CSS</a> | <a href="#">Images</a> | Conception <a href="#">Alco Services</a>
        </div>
    </body>
</html>

JSP modifiermagasin :

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<%@ page pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Modifier un magasin</title>
        <link rel="stylesheet" type="text/css" href="<c:url value="/inc/style.css"/>"/>
    </head>
    <body>
        <div id="main">
            <%-- Entete de page --%>
            <div id="header">
              <div id="banner">
                <div id="welcome"><h1>Online Stock Application</h1></div>
                <div id="welcome_slogan"><h1>Always think big</h1></div>
              </div>
            </div>
 
            <%-- Barre de menu --%>
            <div id="menubar">
                <c:import url="/inc/menu.jsp"/>
            </div>
 
            <%-- Contenu de la page --%>
            <div id="site_content">
                <form action="modifiermagasin" method="post">
                <label for="idMagasin">Code magasin : <span>*</span></label>
                    <input type="text" id="idMagasin" name="idMagasin" value="<c:out value="${magasin.idMagasin}"/>" size="50" maxlength="250" disabled/><br/>
                    <label for="nomMagasin">Nom magasin <span>*</span></label>
                    <input type="text" id="nomMagasin" name="nomMagasin" value="<c:out value="${magasin.nomMagasin}"/>" size="50" maxlength="250"/><span>${form.erreur['nomMagasin']}</span><br/>
                    <label for="adresseMagasin">Adresse <span>*</span></label>
                    <input type="text" id="adresseMagasin" name="adresseMagasin" value="<c:out value="${magasin.adresseMagasin}"/>" size="50" maxlength="250"/><span>${form.erreur['adresseMagasin']}</span><br/>
                    <label for="telephoneMagasin">Telephone <span>*</span></label>
                    <input type="text" id="telephoneMagasin" name="telephoneMagasin" value="<c:out value="${magasin.telephoneMagasin}"/>" size="50" maxlength="250"/><span>${form.erreur['telephoneMagasin']}</span><br/>
                    <input type="submit" id="btnEnvoyer" name="btnEnvoyer" value="Valider"/>
                    <input type="reset" id="btnAnnuler" name="btnAnnuler" value="Annuler"/>
                    <p><c:if test="${!empty form.erreur}"><c:out value="${form.resultat}"/></c:if></p>
                </form>
            </div>
 
            <%--Info pied de page --%>
            <div id="content_grey">
                <div class="content_grey_container_box">
                    <h4>Latest Blog Post</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <div class="content_grey_container_box">
                    <h4>Latest News</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <div class="content_grey_container_boxl">
                    <h4>Latest Projects</h4>
                    <p> Phasellus laoreet feugiat risus. Ut tincidunt, ante vel fermentum iaculis.</p>
                    <div class="readmore"><a href="#">Read more</a></div>
                </div>
 
                <br style="clear:both"/>
 
            </div>
 
        </div>
 
        <%-- Pied de page --%>
        <div id="footer">
            <a href="#">Valid XHTML</a> | <a href="#">Valid CSS</a> | <a href="#">Images</a> | Conception <a href="#">Alco Services</a>
        </div>
    </body>
</html>

Servlet ModifierMagasin :

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package com.servlet;
 
import java.io.IOException;
 
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
 
import com.bean.Magasin;
import com.dao.DaoFactory;
import com.dao.MagasinDao;
import com.form.ModifierMagasinForm;
 
public class ModifierMagasin extends HttpServlet {
 
    private static final String ATT_CONF_DAO_FACTORY = "daofactory";
    private static final String ATT_FORM = "form";
    private static final String ATT_MAGASIN = "magasin";
    private static final String PARAM_ID_MAGASIN = "idMagasin";
    private static final String VUE_MODIFIER_MAGASIN = "/WEB-INF/modifiermagasin.jsp";
 
    private MagasinDao magasinDao;
 
    public void init() throws ServletException{
        this.magasinDao = ((DaoFactory)getServletContext().getAttribute(ATT_CONF_DAO_FACTORY)).getMagasinDao();
    }
 
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 
        String valeurParametre = getValeurParametre(request, PARAM_ID_MAGASIN);
 
        Magasin magasin = magasinDao.selectionnerMagasinParId(Long.parseLong(valeurParametre));
 
        request.setAttribute(ATT_MAGASIN, magasin);
 
        this.getServletContext().getRequestDispatcher(VUE_MODIFIER_MAGASIN).forward(request, response);
    }
 
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
 
        ModifierMagasinForm form = new ModifierMagasinForm(magasinDao);
        Magasin magasin = form.modifierMagasin(request);
 
        request.setAttribute(ATT_FORM, form);
        request.setAttribute(ATT_MAGASIN, magasin);
 
        this.getServletContext().getRequestDispatcher(VUE_MODIFIER_MAGASIN).forward(request, response);
    }
 
    private String getValeurParametre(HttpServletRequest request, String nomParametre){
        String valeurParametre = request.getParameter(nomParametre);
 
        if(valeurParametre == null || valeurParametre.trim().length() == 0){
            return null;
        }else{
            return valeurParametre.trim();
        }
    }
}

Message d'erreur :

Code:

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mai 11, 2017 10:35:06 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVERTISSEMENT: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:gestionclient' did not find a matching property.
mai 11, 2017 10:35:06 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVERTISSEMENT: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:gestioncommande' did not find a matching property.
mai 11, 2017 10:35:06 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVERTISSEMENT: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:gestionconnexion' did not find a matching property.
mai 11, 2017 10:35:06 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVERTISSEMENT: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:gestioninscription' did not find a matching property.
mai 11, 2017 10:35:06 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVERTISSEMENT: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:webstockapplication' did not find a matching property.
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Server version:        Apache Tomcat/7.0.73
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Server built:          Nov 7 2016 21:27:23 UTC
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Server number:         7.0.73.0
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: OS Name:               Windows 8.1
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: OS Version:            6.3
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Architecture:          amd64
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Java Home:             C:\Program Files\Java\jre7
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: JVM Version:           1.7.0_75-b13
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: JVM Vendor:            Oracle Corporation
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: CATALINA_BASE:         C:\Users\Adebayo G. Wilfried\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp5
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: CATALINA_HOME:         C:\tomcat7\apache-tomcat-7.0.73
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Command line argument: -Dcatalina.base=C:\Users\Adebayo G. Wilfried\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp5
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Command line argument: -Dcatalina.home=C:\tomcat7\apache-tomcat-7.0.73
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Command line argument: -Dwtp.deploy=C:\Users\Adebayo G. Wilfried\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp5\wtpwebapps
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Command line argument: -Djava.endorsed.dirs=C:\tomcat7\apache-tomcat-7.0.73\endorsed
mai 11, 2017 10:35:06 AM org.apache.catalina.startup.VersionLoggerListener log
INFOS: Command line argument: -Dfile.encoding=Cp1252
mai 11, 2017 10:35:06 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFOS: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_66/bin/server;C:/Program Files/Java/jre1.8.0_66/bin;C:/Program Files/Java/jre1.8.0_66/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Java\jdk1.7.0_75;C:\wamp\bin\php\php5.5.12;C:\Users\Adebayo G. Wilfried\Desktop\eclipse-jee-kepler-SR2-win32-x86_64\eclipse;;.
mai 11, 2017 10:35:07 AM org.apache.coyote.AbstractProtocol init
INFOS: Initializing ProtocolHandler ["http-bio-8080"]
mai 11, 2017 10:35:07 AM org.apache.coyote.AbstractProtocol init
INFOS: Initializing ProtocolHandler ["ajp-bio-8009"]
mai 11, 2017 10:35:07 AM org.apache.catalina.startup.Catalina load
INFOS: Initialization processed in 2291 ms
mai 11, 2017 10:35:07 AM org.apache.catalina.core.StandardService startInternal
INFOS: Démarrage du service Catalina
mai 11, 2017 10:35:07 AM org.apache.catalina.core.StandardEngine startInternal
INFOS: Starting Servlet Engine: Apache Tomcat/7.0.73
mai 11, 2017 10:35:08 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:09 AM org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom
INFOS: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [171] milliseconds.
mai 11, 2017 10:35:09 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:10 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:11 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:11 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:12 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:35:12 AM org.apache.coyote.AbstractProtocol start
INFOS: Starting ProtocolHandler ["http-bio-8080"]
mai 11, 2017 10:35:12 AM org.apache.coyote.AbstractProtocol start
INFOS: Starting ProtocolHandler ["ajp-bio-8009"]
mai 11, 2017 10:35:12 AM org.apache.catalina.startup.Catalina start
INFOS: Server startup in 4718 ms
null
mai 11, 2017 10:35:39 AM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: "Servlet.service()" pour la servlet ModifierMagasin a généré une exception
java.lang.NumberFormatException: null
    at java.lang.Long.parseLong(Unknown Source)
    at java.lang.Long.parseLong(Unknown Source)
    at com.form.ModifierMagasinForm.modifierMagasin(ModifierMagasinForm.java:54)
    at com.servlet.ModifierMagasin.doPost(ModifierMagasin.java:43)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    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.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
    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:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:958)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
 
mai 11, 2017 10:57:55 AM org.apache.catalina.core.StandardContext reload
INFOS: Le rechargement du contexte [/webstockapplication] a démarré
mai 11, 2017 10:57:55 AM org.apache.catalina.startup.TldConfig execute
INFOS: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mai 11, 2017 10:57:56 AM org.apache.catalina.core.StandardContext reload
INFOS: Le rechargement de ce contexte est terminé

J'ai une idée d'où peut provenir l'erreur (com.form.ModifierMagasinForm.modifierMagasin(ModifierMagasinForm.java:54), mais j'arrive pas à la corriger. rien de ce que je fais ne marche.

Merci de bien vouloir me donner un coup de main afin que je puisse continuer ma formation.