Hi all,

I need to be able to display all my case comments and case emails in an <apex:repeat> block and they should be ordered by the date they were sent. I'm rather new to salesforce development and I'm not 100% sure how to do this. 

I have tried the following:

My Controller:

public class CaseFeedItem
    {
        public string creatorSmallPhotoUrl {get; set;}
        public string createdByName {get; set;}
        public string textBody {get; set;}
        public dateTime createdDate {get; set;}        
    }
    
    public list<CaseFeedItem> myCaseFeedItems {get; set;}

PageReference loadcase(Id caseID) 
    {
        system.debug('loadcase: starting... ');

        if (caseID == null)
            return page.conf_error;  /// NEED TO DO SOMETHING HERE
        
        mycase = 
            [
                SELECT
                        Id,
                        CaseNumber,
                        Subject,
                        Owner.Name,
                        CreatedDate,
                        Status,
                        Description,
                        Auditor_First_Name__c,
                        Auditor_Last_Name__c,
                        Auditor_Email__c,
                        Auditor_Phone__c,
                        Client_Name__c,
                        Client_Year_End_Date__c,
                        Client_No_of_Requests__c,
                        Client_Date_Requests_were_Sent__c,
                        Client_Audit_Deadline_Date__c,
                        ClosedDate,
                		IsClosed
                    FROM 
                        Case
                    WHERE
                        Id = :caseID
            ];
        
        system.debug('viewcase: case: '+mycase.subject);
        
        mycasecomments = 
            [
                SELECT 
                    Id,
                    CommentBody,
                    CreatorName,
                    CreatedById,
                    CreatedDate,
                    CreatorFullPhotoUrl,
                    CreatorSmallPhotoUrl,
                    IsPublished,
                    CreatedBy.Name
                    
                FROM 
                    CaseComment
                WHERE 
                    ParentID = :caseID
                ORDER BY
                    CreatedDate DESC
            ];
 
        myCaseEmails = 
        [
            SELECT
            	Id,
            	FromAddress,
            	FromName,
            	TextBody,
            	MessageDate,
            	ToAddress,
            	Subject
            	
            FROM
            	EmailMessage
            WHERE
            	ParentID = : caseId
            ORDER BY
            	MessageDate DESC
        ];
        newcomment = new CaseComment(ParentId=caseID);
        createCaseFeed();
        return null;

    }

 public void createCaseFeed()
    {
        for(CaseComment comment : mycasecomments)
        {
            CaseFeedItem feedItem = new CaseFeedItem();
            feedItem.creatorSmallPhotoUrl = comment.CreatorSmallPhotoUrl;
            feedItem.createdByName = comment.CreatedBy.Name;
            feedItem.textBody = comment.CommentBody;
            feedItem.createdDate = comment.CreatedDate;
            myCaseFeedItems.add(feedItem);
        }
        
        for(EmailMessage email : myCaseEmails)
        {
            CaseFeedItem feedItem = new CaseFeedItem();
            feedItem.creatorSmallPhotoUrl = null;
            feedItem.createdByName = email.FromName;
            feedItem.textBody = email.TextBody;
            feedItem.createdDate = email.MessageDate;
            myCaseFeedItems.add(feedItem);
        }
    }

<apex:repeat value="{!CaseFeedItems}" var="feedItem">
                        
      <div class="col-md-2 col-sm-2 xs-marginbottom">
            <img src="{!feedItem.creatorSmallPhotoUrl}" width="60" height="60" alt=""/><br/>
             <apex:outputText value="{!feedItem.createdByName}" />
       </div>
       <div class="col-md-10 col-sm-10">
              <apex:outputText value="{!feedItem.textBody}" />
               <br/><br/>
               <small>Date/Time Sent:&nbsp; 
                  <apex:outputText value="{0,date,MM'/'dd'/'yyyy  HH:MM}">
                        <apex:param value="{!feedItem.createdDate}" /> 
                  </apex:outputText>
               </small> 
       </div>
       <div class="col-md-12 col-sm-12">
           <hr/>
        </div>
</apex:repeat>

At the moment I get:

Error: Error occurred while loading a Visualforce page. on /confirmation/conf_caseView
Attempt to de-reference a null object 

And I would also like to find out how I would sort the "myCaseFeedItems" list by date