jdbc - java program not getting inside while loop for unique row result set -

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i have result set should contain 1 row (i have tested this). program not getting inside while(rs2.next()) loop, have noticed after debugging. that's why i'm getting sqlexception : not variables bound.

resultset constitues = cnx.createstatement().executequery(request.getconstitues());              while(constitues.next()){                 preparedstatement ps = cnx.preparestatement(request.setnewconstitue());                 preparedstatement ps2 = cnx.preparestatement(request.getdossierfromnumeroparcelle());                  ps2.setint(1, constitues.getint("num_ordre"));                 ps2.setint(2, constitues.getint("num_parcelle"));                          //rs2 contains 1 row                 resultset rs2 = ps2.executequery();                         // program not entering loop                 while(rs2.next()){                    ps.setint(1, rs2.getint("num_dossier"));                    ps.setstring(2, rs2.getstring("indice"));                    ps.setstring(3, constitues.getstring("observations"));                    ps.setint(4, constitues.getint("type_consistance"));                 }                  ps.executeupdate();                 rs2.close();                 ps.close();              }

request.getconstitues() : 

 select * parc_constitues

request.setnewconstitue() : 

insert constitue(num_dossier,indice,observation,code_consistance) values(?,?,?,?)

request.getdossierfromnumeroparcelle() : 

select num_dossier,indice parc_parcelles num_ordre = ? , num_parcelle= ?

why program not getting inside while loop ?

i suspect data not available in db or failing retrieve db.

but way check condition before go while loop

boolean isempty = ! rs.first();

and print isempty debugging.

so use 

if(!isempty) {  while(rs2.next()){                    ps.setint(1, rs2.getint("num_dossier"));                    ps.setstring(2, rs2.getstring("indice"));                    ps.setstring(3, constitues.getstring("observations"));                    ps.setint(4, constitues.getint("type_consistance")); }             }

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