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How To Stream/Serialize JPA Result As JAX-RS Response For Large Data

java-interview-questions-answers

There are times that retrieving a large data set through JPA is necessary (e.g. more than 1,000,000 records) and having them stuffed into a single instance of java.util.List is just risky (memory barrier). So, here’s a quick solution of how a JAX-RS REST resource end-point could still give us a timely Response without breaking the memory constrain through streaming or ...

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The Prolonged Death Spiral Business Model

I recent message from a friend tells me he is putting on his parachute. He can’t take it anymore. He’s tried hard, very hard, to change a challenged company. Actually, I know a little bit more about this company than I should. I once told him that working there was like being aircrew in Catch-22: Only the sane should work ...

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R: Speeding up the Wimbledon scraping job

Over the past few days I’ve written a few blog posts about a Wimbledon data set I’ve been building and after running the scripts a few times I noticed that it was taking much longer to run that I expected. To recap, I started out with the following function which takes in a URI and returns a data frame containing ...

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The Philosophy of the CUBA Platform

A huge amount has happened recently. Following the official launch of CUBA on 1st of June, we have rolled out a new release, published our first article on a few Java sites and presented the platform at the Devoxx UK сonference in London. But before the rush continues, about it is an apt time to articulate the philosophy behind CUBA. ...

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Generating JSON Schema from XSD with JAXB and Jackson

In this post, I demonstrate one approach for generating JSON Schema from an XML Schema (XSD). While providing an overview of an approach for creating JSON Schema from XML Schema, this post also demonstrates use of a JAXB implementation (xjc version 2.2.12-b150331.1824 bundled with JDK 9 [build 1.9.0-ea-b68]) and of a JSON/Java binding implementation (Jackson 2.5.4). The steps of this ...

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Strategy Pattern in Java 8

These are two examples on how to implement a Strategy pattern design using Java 8 functional style together with Cyclops pattern matching and Hamcrest libraries. PrintDependingOnInput method is a strategy that will System.println some message based on the log passed. AddPrefix is another strategy that will add a prefix to a message based on the message content. package com.marco.patternmatching; import ...

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Two people coding is twice as productive, right?

Stands to reason, doesn’t it? If one person can make 5 widgets an hour, then two people can make 10 widgets an hour. Its just the natural way of things. You can’t argue with science. The same is obviously true of software, isn’t it? If one developer can write 10 lines of code an hour, then clearly two can write 20 lines ...

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