Granny's Programming Pearls
"inside of every large program is a small program struggling to get out"
JavaRanch.com/granny.jsp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Bear Bibeault
  • Tim Cooke
  • Junilu Lacar
Sheriffs:
  • Paul Clapham
  • Devaka Cooray
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • Frits Walraven
Bartenders:
  • Carey Brown
  • salvin francis
  • Claude Moore

How to use HTreeMap to populate a List  RSS feed

 
Aashish Bhutkar
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am trying to use HTreeMap from mapDB to populate a List of million entries in a CSV file, but every time I insert data into the List, the previous entry is overwritten for the HTreeMap.

The only way to avoid overwriting an HTreeMap in the final List of values is to create another DB connection of a hashmap, but with this solution, there is an exception of Java Heap Size.

Is there a subtle way to use HTreeMap in reading a million plus records and adding it to a List without duplicating the data?



The exception reported while executing the above code is as follows.
P.S.: The utility.CSVHandler.fn_ReadCSV_GapListHTMap is a custom class designed by me.

 
I can't beleive you just said that. Now I need to calm down with this tiny ad:
Create Edit Print & Convert PDF Using Free API with Java
https://coderanch.com/wiki/703735/Create-Convert-PDF-Free-Spire
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!