[SalesForce] Invalid conversion from runtime type String to SOBJECT:

I have create a filed set on a custom object and trying to display the filed set to a VF page from apex code. This much is working fine but when i try to loop through the map in which the value is entered i am getting an error Invalid conversion from runtime type String to SOBJECT:. My code :

 public Candidates__c ca_Insert {get; set;} // For inserting Candidates records 
public blob Attach {get;set;}  // For attaching Resume to the specific record
public String fileName {get; set;}
public Attachment a {get; set;}
public Id jobID {get; set;}// To get the ID from URL
public Boolean isSaved{get; set;}// To know is saved successfully
public List<Schema.FieldSetMember> candidateFields{get; set;}
public map<string, Candidates__c> fieldMap {get; set;}
public map<string, string> fieldMap_api {get; set;}
public Candidates__c field_disp {get;set;}


public ctrl_Candidate_Site(){    
    ca_Insert = new Candidates__c(); 
    //ca_Insert = (Candidates__c)stdController.getRecord(); // getting records from VF page 
    jobID = ApexPages.currentPage().getParameters().get('jobId'); // Getting the jobId from URL   
    candidateFields = new List<Schema.FieldSetMember> ();
    a = new Attachment();  
    candidateFields = Schema.SObjectType.Candidates__c.fieldSets.getMap().get('CMSR__Candidate').getFields() ;
    system.debug('Fieldset values ' + candidateFields );

    fieldMap = new map<string, Candidates__c>();
    fieldMap_api = new map<string, string>();
    field_disp = new Candidates__c ();  
     for(integer i =0; i < candidateFields.size(); i++ ){
         system.debug('get field field ' + candidateFields[i] );
         system.debug('get field Label ' + candidateFields[i].getLabel() );
         system.debug('get field Required ' + candidateFields[i].getRequired());
         fieldMap.put( candidateFields[i].getLabel(),  field_disp );
         fieldMap_api.put( candidateFields[i].getLabel(),  candidateFields[i].getFieldPath() );
     }
     system.debug('Map fields' + fieldMap);
}


public PageReference SaveResult(){

     system.debug('Value entered in map from Vf page ' + fieldMap); 
     for(string f : fieldMap.keyset()){

         system.debug('map keyset Value ' + f);
         system.debug('map entered Value ' + string.valueof(fieldMap.get(f)));

     }

     return null;
}

VF page:

<apex:page id="Cnd_page1" showHeader="false" controller="ctrl_Candidate_Site" >

<apex:pageMessages ></apex:pageMessages>

  <style>
    h1{
        font-size:16px;
        padding-left:50px;
        font-family:'trebuchet ms', helvetica, sans-serif;
        color:#3366FF;
        line-height:20px;
    }
    .tableStyle{
        padding-left:50px;
        font-size:14px;
        font-family:'trebuchet ms', helvetica, sans-serif;
        color:#343434;
    }
    .cm_formCss{
         height:100%;
         margin:auto;
         width:960px;


    }
    .tdStyleFirst{
        height:25px;
        margin-bottom:13px;
        margin-left:2px;
        width:50%;
    }
    .tdStyleSecond{
        height:25px;

    }

</style>


<apex:composition template="{!$Site.Template}" >
 <apex:define name="body" > 
    <apex:form id="Cnd_form" >
        <h1>Candidate</h1>
          <table class="tableStyle">              
          <apex:repeat value="{!fieldMap}" var="f"> 

                <tr>



                     <td class="tdStyleFirst"> 
                          <apex:outputText value="{!f}"  />  </td> 
                     <td> <apex:inputText value="{!fieldMap[f]}" />  </td>                         
                </tr>        

          </apex:repeat> 
                  <tr>
                      <td>Attach Resumes</td>
                      <td><apex:inputFile value="{!Attach}" accept="doc, docx, txt, pdf" filesize="1000" filename="{!fileName}"></apex:inputFile> </td>
                  </tr> 
                  <tr>
                      <td></td>                          
                      <td> <apex:commandButton action="{!SaveResult}" value="Submit"/>
                           <apex:commandButton action="{!reset}" value="Reset" /> </td>
                  </tr>

          </table>
    </apex:form>
</apex:define>

can anybody guide me how to get it solved.

Best Answer

This line on visualforce page is reason:

<apex:inputText value="{!fieldMap[f]}" />

fieldMap is a Map which returns sObject type when you pass a key of type String and you are referencing it with <apex:input> which accepts String

Instead of directly assigning sObject Candidate__c assign its field value ex:

<apex:inputText value="{!fieldMap[f].name}" />

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We’ll illustrate this with some code samples. But first, let’s step back and define these terms.

“Pass by value” means when a method is called, a second copy of the parameter variable is made in memory, and this copy is passed to the method as a parameter. This copy can be modified in the method, but the original variable in the caller is unchanged, and the changes to the copy are lost upon return.

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The copy of the memory address passed as a parameter is overwritten with the address of the newly allocated memory. The original, however, is not overwritten. That change in address is not known to the caller!

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You can use either Window.postMessage to safely transfer data between the popup and the original window; this is the preferred method. Alternatively, you can also set an Apex Cookie that can be shared between the two windows. Using expando properties of window.opener should not be used, because you can't even verify that the receiving page is even the original page which opened the popup; this might cause undesirable behavior.

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