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Author Archives: Keyhole Software

Keyhole is a midwest-based consulting firm with a tight-knit technical team. We work primarily with Java, JavaScript and .NET technologies, specializing in application development. We love the challenge that comes in consulting and blog often regarding some of the technical situations and technologies we face.

Using PouchDB for Offline/Data Sync

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Recently the term “Mobile First” received additional notoriety as the new CEO of Microsoft proclaimed the company’s shift in focus. As I’ve been researching mobile frameworks lately, I’ve run across another term – “Offline First.” As much as you may be online with your mobile phone or tablet, inevitably there will be times when you’re not connected, but still need ...

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Java And The Sweet Science

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When you have been developing in Java for 15 years and a coworker asks you to help them debug a null pointer exception, you don’t expect to be surprised. Usually it is quite obvious what is null and the only thing you need to do is find out why. Sometimes it is a little more difficult because someone has created ...

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Don’t just randomize, truly randomize!

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The state of web application cryptography has changed, and each development language provides its own way of working with it. I will touch on the current state of random number generation and the differences found with it within the Java and JavaScript development languages. When designing and building web applications, security concerns obviously play a crucial role. The term security ...

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Processing Java Annotations Using Reflection

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In my previous article covering Java Annotations, I outlined a recent use case and provided you with some examples of custom annotations and how they might be used. In this article, I’m going to take that a step further and give you a few examples of custom annotations and how you would process these custom annotations using the Java Reflection API. ...

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JAXB – A Newcomer’s Perspective, Part 2

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In Part 1 of this series, I discussed the basics of loading data from an XML file into a database using JAXB and JPA. (If JSON is called for instead of XML, then the same idea should translate to a tool like Jackson.) The approach is to use shared domain objects – i.e. a single set of POJOs with annotations ...

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Functional Reactive Programming and JavaScript

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Functional reactive programming (FRP) is an emerging programming paradigm that has recently gained popularity in the web world. That popularity isn’t just tied to fact that the video streaming giant Netflix blogged about how it applies FRP to optimize its API, but because it actually provides an elegant way to reduce the complexity of dealing with time-varying events and asynchronous ...

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JavaScript Promises Are Cool

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“And when I promise something, I never ever break that promise. Never.” ― Rapunzel Many languages have libraries of interesting schemes called promises, deferreds, or futures. Those help to tame the wild asynchronous into something more like the mundane sequential. JavaScript promises can promote separation of concerns in lieu of tightly coupled interfaces. This article is about JavaScript promises of ...

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JAXB – A Newcomer’s Perspective, Part 1

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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 the many arguments that contribute to it are pretty well documented; I won’t spend a lot of time rehashing them here. I believe ...

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Creating Your Own Java Annotations

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If you’ve been programming in Java and using any one of the popular frameworks like Spring and Hibernate, you should be very familiar with using annotations. When working with an existing framework, its annotations typically suffice. But, have you ever found a need to create your own annotations? Not too long ago, I found a reason to create my own annotations for a ...

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Lessons Learned in Automated Testing

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I want to discuss some takeaways from my role as a Quality Assurance (QA) Software Developer. My experiences in QA were two-fold: I started as a Software Engineer responsible for QA on a Scrum team and I later had a role as a QA Engineer responsible for implementing automated testing infrastructure. In the latter position, I made sure teams had ...

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