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The vast majority of data is not in a database. Data, even very large data, is usually exchanged between businesses in the form of files. Processing this data with single-threaded scripts or other code is just not working anymore. Making many passes through the data with SQL isn't working either. How do we implement data-oriented design in Java? Well, first, why would I choose to implement this application in Java? A common misconception about Java is that it doesn't perform and doesn't scale. The argument about Java not scaling is mainly blamed on garbage collection. While that may have been true several Java versions ago, it's not so now. Java can perform well and it can scale.