java - Database locked while trying to open multiple jframes -

my problem , while opening jframe including different informations main jframe , when tried work on jframe, example inserting data sqlite manager's database . it's giving me database locked error.i can insert data main jframe i'm opening new jframes jcombobox. hink know source dont know how fix this. think need close main jframe open other frames. sqlite database can storage frames datas. here i'll give how can open jframes jcombobox , how i'm trying insert data database. please me or , leave comment what're thinking problem. wrong source idea or true. need helps guys. reading.

1: codes how i'm opening jframes combobox.

public void comboselect(){      int d =combobox_name.getselectedindex();     if (d==0){         cezalıuye s=new cezalıuye();         s.setvisible(true);         dispose();       }        if(d==1){      deaktifuye z=new deaktifuye();         z.setvisible(true);                dispose();      }       if(d==2){      tatbikatform l=new tatbikatform();         l.setvisible(true);                dispose();      }            } 

2:this codes how i'm trying insert data opened jcombobox.

 private void cmd_saveactionperformed(java.awt.event.actionevent evt) {                                                   try{      string sql = "insert cezalitablosu (kimtarafından,kime,neden,kaçıncı,tarih) values (?,?,?,?,?)";       pst=conn.preparestatement(sql);       pst.setstring(1, jtextfield1.gettext());      pst.setstring(2, jtextfield2.gettext());   pst.setstring(3, jtextfield3.gettext());   pst.setstring(4, jtextfield4.gettext());   pst.setstring(5, jtextfield5.gettext());          pst.execute();       joptionpane.showmessagedialog(null, "kaydedildi!");       }          catch(exception e)      {            e.printstacktrace();        joptionpane.showmessagedialog(null, e);          }               update_table();       }        

execute() can not use insert,update , delete.

for insert,update , delete use

executeupdate();