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Listen to notifications from Postgresql with Scala


In the past I’ve written a couple of articles (Building a REST service in Scala with Akka HTTP, Akka Streams and reactive mongo and ReactiveMongo with Akka, Scala and websockets) which used MongoDB to push updates directly from the database to a Scala application. This is a very nice feature if you just want to subscribe your application to a ...

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Scaling Agile: Questions to Ask Before Choosing Your Agile Framework


In the fourteen years after the publication of the Agile Manifesto, many organizations have realized significant gains in productivity, quality, and even job satisfaction at the team level. According to the results of Version One’s State of Agile Survey, 94 percent of the respondents are using Agile practices in some manner. The survey also calls out the increasing interest in ...

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Downsides of Mixed Identifiers When Porting Between Oracle and PostgreSQL Databases


Both the Oracle database and the PostgreSQL database use the presence or absence of double quotes to indicate case sensitive or case insensitive identifiers. Each of these databases allows identifiers to be named without quotes (generally case insensitive) or with double quotes (case sensitive). This blog post discusses some of the potential negative consequences of mixing quoted (or delimited) identifiers ...

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What the Heck Is Mutation Testing?


In recent times, I came repeatedly upon the term mutation testing. Since the word is that this approach is able to detect test safety net gaps in a way which goes beyond code coverage, I took my time to catch up on the topic and gave it a try. This post summarizes my findings as a quick introduction to the ...

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Apache JMeter Tutorial


Want to load test your web app? Then you should know about Apache JMeter! This JMeter tutorial explains the basic concepts as well as how to create a test plan and how to execute it to benchmark your application. This is a crossposting of my article on Disy’s Tech-Blog – thanks for letting me write it on company time, guys! ...

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JMS Sender application with ActiveMQ and Maven


We have already seen how to create a JMS Receiver application with ActiveMQ and Maven. Let’s check out how we can similarly create the JMS Sender application. web.xml remains the same as we had used for creating the receiver application: <web-app xmlns="" xmlns:xsi="" xsi:schemaLocation="" version="3.0"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/jmsContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app> jmsContext.xml would change a bit to something like: ...

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Wrap around design pattern in java8


Wrap around pattern is not listed in in GOF book but is very useful for problem like below: Loop construct for e.g do while/while/for loop Stopwatch around some code. Wrap checked exception with run time exception Initialization and cleanup for eg Threadpool creation/destruction or file open/close etc Adding context info to threads for eg request context info for logging or ...

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Simplify Email In Your App with Mailgun API


Mailgun is email for developers. Mailgun has elegant REST API to send and receive emails from your mobile app. I know that many developers send emails from their apps for registration, confirmation, and everything else. To make it simple to use the Mailgun API in an, we have introduced a Mailgun plugin in         ...

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Continuous Deployment circleci, AWS (Elastic Beanstalk), Docker


Introduction We run some of our services in Docker container, under Elastic Beanstalk (EB). We use circleci for our CI cycle. EB, Docker and Circlec integrate really nice for automatic deployment. It’s fairly easy to set up all the services to work together. In this post, I am summarising the steps to do it. About EB Applications and Versions Elastic ...

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