Edit action returns null

Question

I'm new to Struts2 framework and I found a problem when I try to edit an object.

The code of my modification action:

@Action(value = "modifyServer", results = {
        @Result(name = "success", location = Location.MAIN_PAGE),
        @Result(name = "error", location = Location.LOGIN_PAGE) })
public String modifyServer() {
    em = DbConnexion.getEntityManager().createEntityManager();
    String id=request.getParameter(sssid);
    logger.info("id serveur         = "+request.getParameter("id")); 
    try {
        em.getTransaction().begin();
        Simserver server = em.find(Simserver.class, id);
        server.setSssServer(request.getParameter("sssServer"));
        server.setSssIp(request.getParameter("sssIp"));
        server.setSssPort(request.getParameter("sssPort"));
        em.getTransaction().commit();
        System.out.println("modification done !!!");
        em.close();
        return SUCCESS;
    } catch (Exception e) {
        return ERROR;
    }
}

The JSP:

   <form class="form-horizontal" action="modifyServer" role="form"
name="form_message" method="get">
<div id="elmsg"></div>
<div class="panel panel-info">
    <div class="panel-heading expand" id="second-level">
        <h6 class="panel-title">Modification du Serveur</h6>
    </div>
    <div class="panel-body">
        <div class="form-group">
            <label class="col-sm-2 control-label"> Id du Serveur : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssId"
                    disabled="disabled" id="sssId"
                    value="<s:property value="#request.curentserver.sssId" />">
            </div>
        </div>

        <div class="form-group">
            <label class="col-sm-2 control-label"> Nom du Serveur : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssServer"
                    id="sssServer"
                    value="<s:property value="#request.curentserver.sssServer" />">
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label"> Adresse IP : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssIp" id="sssIp"
                    value="<s:property value="#request.curentserver.sssIp" />" />
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label"> Port : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssPort" id="sssPort"
                    value="<s:property value="#request.curentserver.sssPort" />" />
            </div>
        </div>

        <div class="form-actions text-right">
            <button type="submit" value="Envoyer" class="btn btn-success"
                >Modifier le serveur</button>
            <a role="button" href="gestionServeurList" class="btn btn-danger">Retour
                à la list des serveurs</a>
        </div>

---

When I execute my action the request.getParameter returns null.

I think the issue is in the parameter!

Answer 1

If the input element has disabled="disabled" attribute it won't include as parameter when your form is submitted. Also rename the input element name that correspond to a parameter name. Struts2 getter/setter can be used to populate the action bean.

public void setSssId(String id){
  this.id = id;
}