java - Performance issue in Hibernate while using session.merge -

i have method :

// method session session = context.gethibernatesession(); transaction tx = session.begintransaction(); private void method(tablealist alist) { for(a : alist) { session.merge(a); } tx.commit(); } 

when alist contains more 40 50 objects of table a, it's becoming slow , taking lots of time complete. how resolve issue?

entity a:

/**  * persistent class database table.  *   */ @entity @table(name="a") public class implements serializable { private static final long serialversionuid = 1l;  @embeddedid private apk id;  @column(name="action_cd") private string actioncd;  @column(name="ad_lmt") private bigdecimal adlmt;  @temporal( temporaltype.date) @column(name="beg_dt") private date begdt;  @column(name="beg_time") private string begtime;  @column(name="cst_rma") private bigdecimal cstrma;  private string deal;  @temporal( temporaltype.date) @column(name="end_dt") private date enddt;  @column(name="end_time") private string endtime;  @temporal( temporaltype.date) @column(name="ent_dt") private date entdt;  @column(name="ent_time") private string enttime;  @column(name="itm_cd") private string itmcd;  @column(name="pc_tp") private string pctp;  @temporal( temporaltype.date) @column(name="pluc_dt") private date plucdt;  @column(name="prev_perm_ret") private bigdecimal prevpermret;  @column(name="promo_key_value") private string promokeyvalue;  @column(name="ret_prc") private bigdecimal retprc;  public a() { }  public apk getid() {     return this.id; }  public void setid(apk id) {     this.id = id; }  public string getactioncd() {     return this.actioncd; }  public void setactioncd(string actioncd) {     this.actioncd = actioncd; }  public bigdecimal getadlmt() {     return this.adlmt; }  public void setadlmt(bigdecimal adlmt) {     this.adlmt = adlmt; }  public date getbegdt() {     return this.begdt; }  public void setbegdt(date begdt) {     this.begdt = begdt; }  public string getbegtime() {     return this.begtime; }  public void setbegtime(string begtime) {     this.begtime = begtime; }  public bigdecimal getcstrma() {     return this.cstrma; }  public void setcstrma(bigdecimal cstrma) {     this.cstrma = cstrma; }  public string getdeal() {     return this.deal; }  public void setdeal(string deal) {     this.deal = deal; }  public date getenddt() {     return this.enddt; }  public void setenddt(date enddt) {     this.enddt = enddt; }  public string getendtime() {     return this.endtime; }  public void setendtime(string endtime) {     this.endtime = endtime; }  public date getentdt() {     return this.entdt; }  public void setentdt(date entdt) {     this.entdt = entdt; }  public string getenttime() {     return this.enttime; }  public void setenttime(string enttime) {     this.enttime = enttime; }  public string getitmcd() {     return this.itmcd; }  public void setitmcd(string itmcd) {     this.itmcd = itmcd; }  public string getpctp() {     return this.pctp; }  public void setpctp(string pctp) {     this.pctp = pctp; }  public date getplucdt() {     return this.plucdt; }  public void setplucdt(date plucdt) {     this.plucdt = plucdt; }  public bigdecimal getprevpermret() {     return this.prevpermret; }  public void setprevpermret(bigdecimal prevpermret) {     this.prevpermret = prevpermret; }  public string getpromokeyvalue() {     return this.promokeyvalue; }  public void setpromokeyvalue(string promokeyvalue) {     this.promokeyvalue = promokeyvalue; }  public bigdecimal getretprc() {     return this.retprc; }  public void setretprc(bigdecimal retprc) {     this.retprc = retprc; } } 

apk: @embeddable public class apk implements serializable {

private static final long serialversionuid = 1l;  @column(name="sku_num") private string skunum;  @column(name="prc_zone_cd") private string prczonecd;  @column(name="prc_grp_cd") private string prcgrpcd;  @column(name="pc_num") private string pcnum;  public apk() { } public string getskunum() {     return this.skunum; } public void setskunum(string skunum) {     this.skunum = skunum; } public string getprczonecd() {     return this.prczonecd; } public void setprczonecd(string prczonecd) {     this.prczonecd = prczonecd; } public string getprcgrpcd() {     return this.prcgrpcd; } public void setprcgrpcd(string prcgrpcd) {     this.prcgrpcd = prcgrpcd; } public string getpcnum() {     return this.pcnum; } public void setpcnum(string pcnum) {     this.pcnum = pcnum; }  public boolean equals(object other) { if (this == other) { return true; } if (!(other instanceof apk)) { return false; } apk castother = (apk)other; return  this.skunum.equals(castother.skunum) && this.prczonecd.equals(castother.prczonecd) && this.prcgrpcd.equals(castother.prcgrpcd) && this.pcnum.equals(castother.pcnum);  }  public int hashcode() { final int prime = 31; int hash = 17; hash = hash * prime + this.skunum.hashcode(); hash = hash * prime + this.prczonecd.hashcode(); hash = hash * prime + this.prcgrpcd.hashcode(); hash = hash * prime + this.pcnum.hashcode();  return hash; } }