Apex Class-BatchJobProgressBarController

public class BatchJobProgressBarController {
    private Id batchClassId;
    final public String NOT_START = 'not_started';
    final public String PROCESSING = 'processing';
    final public String FINISHED = 'finished';
    public String batchStatus {get;set;}
    public Id batchId {get;set;}
    public String message {get;set;}
    public Integer errornum {get;set;}
    
    public BatchJobProgressBarController (){
        //here specify the Apex batch class name for which you want to display progress bar
        batchClassId = [Select Name, Id From ApexClass Where Name = 'RecordTypeAccessFinder' Limit 1][0].id;
        batchStatus = NOT_START;
        batchId = null;
        message = ''; 
        errornum =0; 
       
    }
    public boolean getShowProgressBar() {
        if(batchStatus == PROCESSING )
            return true;
        return false;
    }
    //this method will fetch apex jobs and will update status,JobItemsProcessed,NumberOfErrors,TotalJobItems
    public BatchJob[] getJobs() {
        
        List<AsyncApexJob> apexJobs = 
            [Select TotalJobItems, Status, NumberOfErrors, ExtendedStatus, JobItemsProcessed, Id, JobType, ApexClassId, CreatedDate From AsyncApexJob Where ApexClassId =: batchClassId Order by CreatedDate DESC];
        
        if(apexJobs.size() == 0) {
            return new List<BatchJob>();
        }

        List<BatchJob> jobs = new List<BatchJob>();      
        for(AsyncApexJob job : apexJobs) {
            if(job.id != batchId)
                continue;
                
            BatchJob bj = new BatchJob();
            bj.isCompleted = false;
            
            if(job.ApexClassId == batchClassId) {
                bj.Job_Type = 'Process 1';
            }            
            bj.aj = job;

            // NOT START YET
            if(job.jobItemsProcessed == 0) {
                bj.Percent= 0;
                jobs.add(bj);
                continue;
            }

            Decimal d = job.jobItemsProcessed;
            d = d.divide(job.TotalJobItems, 2)*100;
            bj.Percent= d.intValue();

            // PROCESSING
            if(bj.Percent != 100){
                jobs.add(bj);
                continue;
            }

            // FINISED
            if(job.ApexClassId == batchClassId) {
                batchStatus = FINISHED;
                                
            }
            errornum += job.NumberOfErrors;
            bj.isCompleted = true;
            jobs.add(bj);           
        }
        return jobs;
    }


    public PageReference StartBactJob() {
        //execute RecordTypeAccessFinder batch
        if(!test.isRunningTest()){
                string selectedObject='Account';
                RecordTypeAccessFinder acc=new RecordTypeAccessFinder(selectedObject);
                batchId=database.executebatch(acc,10);
                system.debug('************batchid:'+batchid);
  
        }
        batchStatus = PROCESSING;
        return null;
    }
    
    public PageReference updateProgress() {
        if(batchStatus == FINISHED) {
            message = 'COMPLETED';
        }
        return null;
    }
    public class BatchJob{
        public AsyncApexJob aj {get;set;}
        public Integer Percent {get;set;}
        public String Job_Type {get;set;}
        public Boolean isCompleted {get;set;}
        public BatchJob(){}     
    }

}

VF Page-

<apex:page controller="BatchJobProgressBarController">
<style>
    .prog-bar {
      height: 14px;
      margin: 3px;
      padding: 0px;
      padding-right:3px;
      background: #FFA037;
      text-align:right;
      font-size:12px;
      font-weight:bold;
      color:#333333;
    }

    .prog-bar-done {
      height: 14px;
      margin: 3px;
      padding: 0px;
      padding-right:3px;
      background: #C9DDEC;
    }

    .prog-border {
      width: 209px;
      background: #fff;
      border: 1px solid silver;
      margin: 0px;
      padding: 0px;
    }
    </style>
<apex:form id="f1">
    <apex:pageBlock >
        <apex:pageblockButtons location="top">
            <apex:commandButton value="Start batch Job" action="{!StartBactJob}" rerender="f1" status="actionstatus"/>
            <apex:actionPoller rerender="f1" interval="5" action="{!updateProgress}" status="counterstatus"/>
        </apex:pageblockButtons>
        
        <apex:pageblockSection columns="1">
            <apex:pageBlockTable id="prog" value="{!Jobs}" var="item">
                <apex:column headerValue="{!$ObjectType.AsyncApexJob.fields.Status.label}" >
                    <apex:outputText value="{!item.aj.status}"/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                  <apex:image url="/img/loading.gif" id="progressbar_img1" rendered="{!ShowProgressBar}" style="visibility: {!IF(item.isCompleted,'hidden','visible')}"/>
                </apex:column>
                <apex:column headerValue="Progress (%)"> 
                    <div class="prog-border" >
                        <apex:outputPanel layout="block" styleClass="{!if(item.Percent>=100,'prog-bar-done','prog-bar')}" style="width: {!item.Percent*2}px;">
                            <apex:outputText value="{!item.Percent}" rendered="{!if(item.Percent!=100,true,false)}" />
                        </apex:outputPanel> 
                    </div>
                </apex:column>
            </apex:pageBlockTable> 
        </apex:pageblockSection>
    </apex:pageBlock>
</apex:form>
</apex:page>

Hello Sunil - I am trying to write a class for the controller. However I seem to have got stuck when I attempt to pass the batchid as its returning a null. Could you please help me know how do I go about this?