Home » Author Archives: Craig Flichel

Author Archives: Craig Flichel

The Mouse is a Programmer’s Enemy

One of the first programming management books I was encouraged to read was Peopleware – Productive Projects and Teams. It was a great read and I try to re-read it every once in a while. One of the topics covered is actually a term that comes from psychology – flow. Flow carries the idea of being completely mentally immersed in ...

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Java Enterprise Software Versus What it Should Be


A lot of developers end up in the Java “enterprise” world at some point in their careers. I know the term alone conjures up all kinds of reactions, and rightly so. Often environments where lots of interesting technical challenges exist end up being those that nobody wants to work on because they are brittle, difficult to work on and just ...

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Why Developers Keep Making Bad Technology Choices

Today, software developers are faced with a great abundance of options when choosing how to design and implement systems. We are constantly bombarded with choice and are used to dealing with buzzwords like NoSQL, the cloud, REST, Map-Reduce and so on. However, developers in charge of designing systems can be easily seduced into incorporating technologies that don’t provide a clear ...

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Common and Unique Elements In Multiple Collections

This week, we’ll take a break from higher level problems and technology posts to deal with just a little code problem that a lot of us have probably faced. It’s nothing fancy or too hard, but it may save one of you 15 minutes someday, and occasionally it’s nice to get back to basics. So let’s get down to it. ...

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Problems with ORMs Part 2 – Queries

In my previous post on Object-Relational Mapping tools (ORMs), I discussed various issues that I’ve faced dealing with the common ORMs out there today, including Hibernate. This included issues related to generating a schema from POJOs, real-world performance and maintenance problems that crop up. Essentially, the conclusion is that ORMs get you most of the way there, but a balanced ...

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Morphia and MongoDB: Evolving Document Structures

In my previous post on Morphia, I went through some typical usages and mentioned some caveats and workarounds for known problems. I showed how easy it is to work with Morphia and how cleanly it interacts with the Java world. To follow up on that post, I’m going to discuss how to deal with some real life needs: handling changing ...

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Cloning of Serializable and Non-Serializable Java Objects

Frequently developers rely on 3d party libraries to avoid reinventing the wheel, particularly in the Java world, with projects like Apache and Spring so prevalent. When dealing with these frameworks, we often have little or no control of the behaviour of their classes. This can sometimes lead to problems. For instance, if you want to deep clone an object that ...

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Ignoring Self-Signed Certificates in Java

A problem that I’ve hit a few times in my career is that we sometimes want to allow self-signed certificates for development or testing purposes. A quick Google search shows the trouble that countless Java developers have run into over the years. Depending on the exact certificate issue, you may get an error like one of the following, though I’m ...

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Java 7 Feature Overview

We discussed previously everything that didn’t make it into Java 7 and then reviewed the useful Fork/Join Framework that did make it in. Today’s post will take us through each of the Project Coin features – a collection of small language enhancements that aren’t groundbreaking, but are nonetheless useful for any developer able to use JDK 7. I’ve come up ...

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Using MongoDB with Morphia

In the past few years, NoSQL databases like CouchDB, Cassandra and MongoDB have gained some popularity for applications that don’t require the semantics and overhead of running a traditional RDBMS. I won’t get into the design decisions to go into choosing a NoSQL database as others have done a good enough job already, but I will relate my experience with ...

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