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How to use HTreeMap to populate a List  RSS feed

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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.

It is sorta covered in the JavaRanch Style Guide.
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