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JUnit: testing exception with Java 8 and Lambda Expressions

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In JUnit there are many ways of testing exceptions in test code, including try-catch idiom, JUnit @Rule, with catch-exception library. As of Java 8 we have another way of dealing with exceptions: with lambda expressions. In this short blog post I will demonstrate a simple example how one can utilize the power of Java 8 and lambda expressions to test ...

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6 Reasons Not to Switch to Java 8 Just Yet

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Java 8 is awesome. Period. But… after we had the chance to have fun and play around with it, the time has come to quit avoiding the grain of salt. All good things come with a price and in this post I will share the main pain points of Java 8. Make sure you’re aware of these before upgrading and letting ...

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RxJava + Java8 + Java EE 7 + Arquillian = Bliss

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Microservices are an architectural style where each service is implemented as an independent system. They can use their own persistence system (although it is not mandatory), deployment, language, … Because a system is composed by more than one service, each service will communicate with other services, typically using a lightweight protocol like HTTP and following a Restful Web approach. You ...

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Configuring Chef part 1

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Below are the first steps in getting started with using chef. The three main components of chef are :                   Work station This is the developer’s machine will be used to author cookbooks and recipes and upload them to the chef-server using the command line utility called knife. Chef-Server This is the ...

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Why You Need a Strategic Data Service

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It’s no longer even a question that data is a strategic advantage. Every business is a data business now, and it’s no longer sufficient to store and archive data, you need to be able to act on it: protect, nurture, develop, buy and sell it. Billion-dollar businesses are built around it. But many businesses are running into the reality that ...

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Seriously. The Devil Made me do It!

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Just as eternal as the cosmic struggle between good and evil is the challenge between our two natures. Religion aside, we have two natures, the part of us that: thinks things through; make good or ethical decisions a.k.a. our angelic nature react immediately; make quick but often wrong decisions a.k.a. our devil nature Guess the powers that be left a bug in ...

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Custom Cassandra Data Types

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In the blog post Connecting to Cassandra from Java, I mentioned that one advantage for Java developers of Cassandra being implemented in Java is the ability to create custom Cassandra data types. In this post, I outline how to do this in greater detail. Cassandra has numerous built-in data types, but there are situations in which one may want to ...

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PostgreSQL’s Table-Valued Functions

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Table-valued functions are an awesome thing. Many databases support them in one way or another and so does PostgreSQL. In PostgreSQL, (almost) everything is a table. For instance, we can write:                 CREATE OR REPLACE FUNCTION f_1 (v1 INTEGER, v2 OUT INTEGER) AS $$ BEGIN v2 := v1; END $$ LANGUAGE plpgsql; … ...

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Top 5 Java Performance Tuning Books – Best of Lot, Must read

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Why Java developer should read a book on Performance tuning? When I first faced this question long time back, I thought I will do it later, but I never get back to that for a long time. I realize my mistake of having lack of knowledge on performance measurement, tuning and finding bottleneck only when I faced serious performance and ...

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