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How I Chose my Replacement for Parse.com Part 2

You probably recently received the “Next Steps from the Parse Team” newsletter in your inbox in which you were urged to take immediate action as it pertains to migrating your Parse.com-hosted apps. Or at least, you’re aware of the ultimate January 28, 2017 deadline for migrating your apps. While you should take such reminders seriously, there’s no need to panic. ...

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Remembering to Reset Thread Context Class Loader

I’m having a difficult time thinking of anything I like less about working with Java than working with class loaders. This is particularly true when working with application servers or OSGi where the use of multiple class loaders is prevalent and the ability to use class loaders transparently is reduced. I agree with the OSGI Alliance Blog post What You ...

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Testing Spark Streaming: Unit testing

There is enough evidence to prove the importance of automated testing. Projects in new fields often neglect automated testing, as the domain itself steals the attention of the developers. However, lack of testing implies ‘laugh now, cry later’. Some of the tools around Big Data space have been architected around testability or, at least, the community has taken care of ...

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How to avoid underestimating complexity

People involved in software projects would say that software development is about understanding complexity. What is complexity? Complexity is easy to define at a high level, but people get vague when pressed for a precise definition.  Let’s see if we can quantify the problem, then come back and define it.             Assume we need to ...

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Update DynamoDB Items with Java

java-interview-questions-answers

On a previous post we proceeded into inserting items to DynamoDB using Java. DynamoDB also supports updating items. We will use the Login table for the update examples. When issuing an update you must specify the primary key of the item you want to update. public void updateName(String email,String fullName) { Map<String,AttributeValue> attributeValues = new HashMap<>(); attributeValues.put("email",new AttributeValue().withS(email)); attributeValues.put("fullname",new AttributeValue().withS(fullName)); ...

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Ye Olde Monolith

As a professional software engineer, you probably have encountered an architectural stumbling block known as a MONOLITH#1. A monolith is essentially a single tier application in enterprise architecture. Forget about the traditional break-down of Java EE application, where they break down an Uber-WAR file into presentation, business-logic and database tiers. That is just gloss over our very eyes, a single ...

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Guide to time and date in Java

Properly handling dates, time, time zones, daylight saving time, leap years and such has been my pet peeve for a long time. This article is not a comprehensive guide to time domain, see Date and time in Java – much more detailed but slightly, ekhem, dated. It’s still relevant, but doesn’t cover java.time from Java 8. I want to cover ...

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