java - Puting data in HashMap is taking too much time -

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hashmap<string, object> merchantdetailmap = new hashmap<string, object>();                   if(dataandsize != null)             {                 resultlist<voltmerchantdetail>  tempmerchantlist = (resultlist<voltmerchantdetail>) dataandsize.get("voltdbdatalist");                 vmerchantlist = (list<voltmerchantdetail>) tempmerchantlist;                 for(voltmerchantdetail vmerchant : vmerchantlist){                     hashmap<string, object> merchantdetails = new hashmap<string, object>();                     merchantdetails.put("toactormsisdn", vmerchant.gettoactormsisdn());                     merchantdetails.put("fromactormsisdn", vmerchant.getfromactormsisdn());                     merchantdetails.put("customcol1", vmerchant.getcustomcol1());                     merchantdetails.put("customcol2", vmerchant.getcustomcol2());                     merchantdetails.put("customcol3", vmerchant.getcustomcol3());                     merchantdetails.put("customcol4", vmerchant.getcustomcol4());                     merchantdetails.put("customcol5", vmerchant.getcustomcol5());                                    merchantdetailmap.put(vmerchant.getmerusername(),merchantdetails);                 }

value of key (vmerchant.getmerusername()) = papzg+jjzrss4s1frqgkra==

problem time takes time (10 - 15 minutes put elements in it) or hangs during put.

what can problem

i recommend use java profiler see taking of time.

to me, implausible creating ~20 hashmaps 7 entries , adding them hashmap taking 10 15 minutes. real problem more else; example:

  • the query creating resultlist taking long time,
  • the resultlist has many more entries think, or
  • the heap full, , gc running repeatedly in last ditch attempt reclaim space.

for worth, if replaced hashmap used represent merchantdetails simple java class 7 named fields , 7 getters and/or setters, loading process faster, , loaded map take less memory.


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