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1. JPA Mini Book

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Hibernate Tutorial – The ULTIMATE Guide

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EDITORIAL NOTE: Hibernate ORM (Hibernate in short) is an object-relational mapping framework, facilitating the conversion of an object-oriented domain model to a traditional relational database. Hibernate solves the object-relational impedance mismatch problems by replacing direct persistence-related database accesses with high-level object handling functions. Hibernate is one of the most popular Java frameworks out there. For this reason we have provided ...

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How to exclude libraries from all dependencies in Gradle

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I am using Spring boot. Spring boot by default comes with logback. I wanted to use log4j (for whatever reasons..) In order to do that I had to exclude logback and add new log4j dependencies: Logback is “hidden” inside this package: compile("org.springframework.boot:spring-boot-starter:$project.ext.springBootVersion") { exclude module: 'org.springframework.boot:spring-boot-starter-logging' } compile("org.springframework.boot:spring-boot-starter-log4j:$project.ext.springBatchVersion") Now when you try to run app you get this Exception: SLF4J: Class ...

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Shooting yourself in the foot with Random number generators

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This is not going to be one of the posts explaining how a random number generator is not so random after all. So those of you expecting a guideline for how to hack a slot machine, move along, nothing to see here. Instead, it is a post about one of the not-so-uncommon lock contention issues, hidden inside random number generators ...

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Hot and cold rx-java Observable

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My own understanding of Hot and Cold Observable is quite shaky, but here is what I have understood till now! Cold Observable Consider an API which returns an rx-java Observable: import obs.Util; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import rx.Observable; import rx.schedulers.Schedulers; public class Service1 { private static final Logger logger = LoggerFactory.getLogger(Service1.class); public Observable<String> operation() { return Observable.<String>create(s -> { logger.info("Start: ...

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A New Idea for Calling Functions

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Disclaimer: This is going to come off a bit ranty. I’m not as frustrated by the “problems” I bring us as it sounds; rather, it is used to emphasize why my thought processes did what it did. I’m not even going to be using header titles, which is weird for me :) I’ve had a recent thought process about calling ...

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Common Agile objections

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Last time (“Waterfall works when…”) I promised to discuss some of those common objections to “Agile.” (Actually, reading back this this post I’m struck by how like my “12 Myths of Agile Development” which was originally a blog post 2 years ago called “11 Agile Myths of 2 Truths”.) (Apologies by the way, “Waterfall works when…” was misposted the first ...

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Waterfall works when…

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I frequently find myself in situations where someone says something like: “Waterfall is appropriate when…” Some people out there think there are occasions when an Agile (mainly iterative) approach is “best’ and other occasions when “Waterfall” is “best”. Most of the time I let this line of argument go because its boring, I can’t be bothered arguing. (I’ll look at ...

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Neo4j: Generating real time recommendations with Cypher

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One of the most common uses of Neo4j is for building real time recommendation engines and a common theme is that they make use of lots of different bits of data to come up with an interesting recommendation. For example in this video Amanda shows how dating websites build real time recommendation engines by starting with social connections and then ...

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Replanning your project with a time machine

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I have an amazing time machine that lets me think better about projects. This is part 1 in a series of blog posts exploring the use of a time machine. Let’s say that you have a project that has been running for a couple of months. Looking back at your issue tracker and other artifacts, you notice that it’s hard ...

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InetAddressImpl#lookupAllHostAddr slow/hangs

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Since I upgraded to Yosemite I’ve noticed that attempts to resolve localhost on my home network have been taking ages (sometimes over a minute) so I thought I’d try and work out why. This is what my initial /etc/hosts file looked like based on the assumption that my machine’s hostname was teetotal: $ cat /etc/hosts ## # Host Database # ...

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