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Grouping, sampling and batching – custom collectors in Java 8

Continuing first article, this time we will write some more useful custom collectors: for grouping by given criteria, sampling input, batching and sliding over with fixed size window. Grouping ...
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Java: Determining the status of data import using kill signals

A few weeks ago I was working on the initial import of ~ 60 million bits of data into Neo4j and we kept running into a problem where the import process just seemed to freeze and nothing ...
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Identifying JVM – trickier than expected

In Plumbr we have spent the last month by building the foundation for future major improvements. One of such building blocks was addition of the unique identifier for JVM in order to ...
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Building extremely large in-memory InputStream for testing purposes

For some reason I needed extremely large, possibly even infinite InputStream that would simply return the samebyte[] over and over. This way I could produce insanely big stream of ...
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JAXB – A Newcomer’s Perspective, Part 1

I know what a lot of you are already thinking, so let’s get this out of the way: “JAXB? As in XML? Come on, all the cool kids are using JSON.” The “XML vs. JSON” debate and ...
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Java Keystore Tutorial

                     Table Of Contents1. Introduction 2. SSL and how it works 3. Private Keys 4. Public Certificates 5. Root ...
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The Knapsack problem

I found the Knapsack problem tricky and interesting at the same time. I am sure if you are visiting this page, you already know the problem statement but just for the sake of completion ...
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An Introduction to Generics in Java – Part 6

This is a continuation of an introductory discussion on Generics, previous parts of which can be found here. In the last article we were discussing about recursive bounds on type parameters. ...
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Daemonizing JVM-based applications

Deployment architecture design is a vital part of any custom-built server-side application development project. Due to it’s significance, deployment architecture design should commence ...
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Introduction to writing custom collectors in Java 8

Java 8 introduced the concept of collectors. Most of the time we barely use factory methods from Collectors class, e.g. collect(toList()), toSet() or maybe something more fancy ...
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