Playframework 2.6.x FormUrlEncoded return null value in post action

I tried to extract some manytomany values with request().body().asFormUrlEncoded().get(“RolesItems”);

My model :

@Entity 
public class Sysuser extends BaseModel {
        
	@Constraints.Required
    public String username;

    @ManyToMany(cascade=CascadeType.ALL)
    public List<Role> roles;

My routes :

POST    /sysusers/:id                  controllers.SysuserController.update(id:Long)
POST    /DelRoles/:id                  controllers.SysuserController.DeleteRoles(id:Long)

But it seems to return a value here :

/** 
  * DELETE Roles from Sysuser
  */
public Result DeleteRoles(Long id) 
{
  String[] postAction = request().body().asFormUrlEncoded().get("RolesItems");	
  Logger.info("Post Action is not null : "+postAction);
.
.
  if (postAction == null || postAction.length == 0) 
    {return badRequest("No roles selected");}             
  else
    {String selected = ListUtils.mkString(postAction, s -> "" + s, ";");
     String[] ids = selected.split(";");
     Logger.info("Ids Selected are : "+ids);	  
        for (String temp : ids) 
        {
		 List<Role> roles = new ArrayList<Role>();
		 roles.add(Role.find.ref(Long.valueOf(temp)));
		 Logger.info("List of roles here : "+roles);
		 /*
		 final Sysuser sysuser = Sysuser.find.byId(id);    
                 sysuser.roles.remove(Role.find.byId(Long.parseLong(temp)));
	         Logger.info("Id : "+temp+" a été supprimé avec succès");
         sysuser.save();*/
		}      
    }    
	String refererUrl = request().getHeader("referer");
    return redirect(refererUrl);
}

And returning a Null value here :

    public CompletionStage<Result> update(Long id) throws PersistenceException {		
  String[] postAction = request().body().asFormUrlEncoded().get("RolesItems");	
  Logger.info("Post Action is null : "+postAction);
.
.
        Form<Sysuser> sysuserForm = formFactory.form(Sysuser.class).bindFromRequest();  
        if (sysuserForm.hasErrors()) {
            // Run departments db operation and then render the failure case
            return departmentRepository.options().thenApplyAsync(departments -> {
                // This is the HTTP rendering thread context
                return badRequest(views.html.sysuser.edit.render(Sysuser.findByUserName(request().username()), id, sysuserForm, departments, Sysuser.find.byId(id)));
            }, httpExecutionContext.current());
        } else {			
            Sysuser newSysuserData = sysuserForm.get();  		
            // Run update operation and then flash and then redirect
            return sysuserRepository.update(id, newSysuserData).thenApplyAsync(data -> {
                // This is the HTTP rendering thread context
                flash("success", "Sysuser ["+ newSysuserData.name +"] a été modifié avec succès");				
				return GO_HOME;                
            }, httpExecutionContext.current());
        }
    }

The both methods are POST, but why in the update, seems to return a NULL value of :
public CompletionStage<Result> update(Long id) throws PersistenceException { String[] postAction = request().body().asFormUrlEncoded().get("RolesItems"); Logger.info("Post Action is null : "+postAction);

But here, the postaction is not null :

/** 
  * DELETE Roles from Sysuser
  */
public Result DeleteRoles(Long id) 
{
  String[] postAction = request().body().asFormUrlEncoded().get("RolesItems");	
Logger.info("Post Action is not null : "+postAction);