Passer la liste de la servlet vers jsp
Bonjour,
Mon but est de pouvoir exécuter une requête de la base de données MySQL et charger le résultat dans un <option value=""></option>.
Voici ma jsp:
Code:
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|
<label for="choix">Liste :</label>
<select name="type_relance">
<option value=""></option>
<%List<Type_relance> romy=(List<Type_relance>) request.getAttribute("Relance"); %>
<% for(int j=0;j<romy.size();j++){%>
<option value=""><%= romy.get(j).getTyperelance() %></option>
<% } %>
</select> |
Ma servlet: Relance:
Code:
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| package servletPackage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import daoPackage.DaoType_relance;
public class Relance extends HttpServlet {
public static final String VUE="relance.jsp";
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
req.setAttribute("Type_relance",DaoType_relance.select_typerelance());
this.getServletContext().getRequestDispatcher(VUE).forward(req, resp);
}
} |
Ma servlet DaoType_relance
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package daoPackage;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import classMetier.Type_relance;
import daoPackage.ConnexionManager;
public class DaoType_relance {
public static List<Type_relance> select_typerelance(){
ResultSet result;
List<Type_relance> list = new ArrayList<Type_relance>();
ConnexionManager connection= new ConnexionManager();
if(connection.Connecter_Bd()){
String sql ="SELECT * FROM Table";
PreparedStatement select_typerelance =null;
try{
select_typerelance = ConnexionManager.con.prepareStatement(sql);
result=select_typerelance.executeQuery();
while (result.next()){
System.out.println("Dans le while de la liste des type de relance");
Type_relance typerelance=new Type_relance(result.getInt(1),result.getString(2),result.getString(3));
list.add(typerelance);
}
} catch (Exception e){
System.out.println("Erreur d'execution de la requete"+e.getMessage());
}
finally {
ConnexionManager.fermerConnection(ConnexionManager.con);
}
}
return list;
}
} |
Et exécutant tout ceci, j'ai ce message d'erreur:
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|
janv. 22, 2015 6:01:40 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [jsp] in context with path [/cm.xxxxxx] threw exception [An exception occurred processing JSP page /relance.jsp at line 33
30: <select name="type_relance">
31: <option value=""></option>
32: <%List<Type_relance> romy=(List<Type_relance>) request.getAttribute("Relance"); %>
33: <% for(int j=0;j<romy.size();j++){%>
34: <option value=""><%= romy.get(j).getTyperelance() %></option>
35: <% } %>
36: </select>
Stacktrace:] with root cause
java.lang.NullPointerException
at org.apache.jsp.relance_jsp._jspService(relance_jsp.java:151)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
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:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source) |
Merci de votre aide
