java - How to set true or false if there is no record in table using hibernate -

i using spring rest hibernate , fetching particular record database table passing id method. method working if there no record in table want false in variable , if record exist want true in variable in json object.

here entity class subscribe.java

@entity @table(name="subscribe") @jsonignoreproperties({"hibernatelazyinitializer", "handler"}) public class subscribe implements serializable {  private static final long serialversionuid = 1l;      @id @generatedvalue @column(name="id") private long id;  @column(name="subscribed_id") private string subid;  @column(name="subscriber_id") private long subrid;   public long getsubrid() {     return subrid; }  public void setsubrid(long subrid) {     this.subrid = subrid; }  public string getsubid() {     return subid; }  public void setsubid(string subid) {     this.subid = subid; }  public long getid() {     return id; }  public void setid(long id) {     this.id = id; }  } 

here dao class

@suppresswarnings({ "unchecked", "rawtypes" }) public list<subscribe> getsubscribebyid(long id) throws exception {     session = sessionfactory.opensession();     criteria cr = session.createcriteria(subscribe.class);     cr.add(restrictions.eq("subrid", id));     list results = cr.list();       tx = session.gettransaction();     session.begintransaction();     tx.commit();     return results; } 

and here controller

    @requestmapping(value = "/subscribe/{id}", method = requestmethod.get) public @responsebody list<subscribe> getsubscriber(@pathvariable("id") long id) {      list<subscribe> sub = null;     try {         sub = profileservice.getsubscribebyid(id);      } catch (exception e) {         e.printstacktrace();     }      return sub; } 

please suggest me how can can this

given way code structured ( pass database object directly rest client ) there no clean way can this.

i think more restful approach return http code indicates requested record not found. http 404 appropriate code use.

so, in pseudo-code,

@requestmapping(value = "/subscribe/{id}", method = requestmethod.get) public @responsebody list<subscribe> getsubscriber(@pathvariable("id") long id) {      list<subscribe> sub = null;     try {         sub = profileservice.getsubscribebyid(id);      } catch (exception e) {         e.printstacktrace();     }      if ( sub.isempty() ){         return http 404  result code     } else {         return sub;     } } 

your client side code need altered respond http result code rather boolean value, otherwise remain unchanged.