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Ceylon on Java 9 + Jigsaw


Everyone is talking about modules these days. New languages try to incorporate them, and older languages try to retrofit them in. Which is great news, because modules are essential. Java 9 is around the corner, because it’s supposed to come out next year, and the really big new feature is modularity, which it calls the Jigsaw project. Ceylon is a ...

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How to Fill Sparse Data With the Previous Non-Empty Value in SQL


The following is a very common problem in all data related technologies and we’re going to look into two very lean, SQL-based solutions for it: How do I fill the cells of a sparse data set with the “previous non-empty value”? The problem The problem is really simple and I’m reusing the example provided by Stack Overflow user aljassi in ...

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The importance of tuning your thread pools


Whether you know it or not, your Java web application is most likely using a thread pool to handle incoming requests. This is an implementation detail that many overlook, but sooner or later you will need to understand how the pool is used, and how to correctly tune it for your application. This article aims to explain the threaded model, ...

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Real time sentiment analysis example with Apache Storm


Real Time Sentiment Analysis refers to processing streams of natural language text (or voice) in order to extract subjective information. The trivial use case is for building a recommendation engine or for finding social media trends. I have selected Apache Storm as real time processing engine. Storm is very robust (we are using it on production) and very easy to ...

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Microservices and Java EE


Microservices based architectures are everywhere these days. We learn so much about how today’s innovators, like Netflix and Amazon use these to be even more successful in generating more business. But what about all of us, who are using Java EE application servers and write classical systems? Are we all doing it wrong? And how could we make our technical designs ...

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Dockerizing Web Application with Puppet


In post Installing Puppet Modules – Librarian Puppet we provisioned a Vagrant VM to install the puppet module from  Puppet Forge using librarian-puppet, now in this post we will do the same thing except we provision Docker container instead of Vagrant VM and deploy a hello-spring application in provisioned container. Before starting with application deployment in Docker container let’s understand brief about Docker and ...

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Running Web Application in Linked Docker Containers Environment


In post Dockerizing Web Application with Puppet we hosted web application in a single container, this time we will host a web application in a linked docker container environment – one in which our database (mysql) resides leveraged by our web application hosted in another docker container. Before start, let’s have a brief about Linking Docker containers and how it helps us. Linking ...

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Configuring Logstash with Filebeat


In post Configuring ELK stack to analyse Apache Tomcat logs  we configured Logstash to pull data from directory whereas in this post we will configure Filebeat to push data to Logstash. Before configuring, let’s have a brief about why we need Filebeat. Why Filebeat? Filebeat helps in decentralization the server where logs are generated from where logs are processed, thus sharing the load from a single ...

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Using the JDBC Insert Features in Oracle


Introduction In this article I will show an example of how to use the JDBC bulk insert features supported by Oracle — and which are specific to Oracle. For more details on why one might like to resort to using bulk inserts in general, e.g., performance considerations when certain circumstances warrant, see the JCG article, “JDBC Batch Insert Example ” ...

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Safe Database Migration Pattern Without Downtime


I’ve been doing a continuous delivery talk for a while now and during my talk I describe a pattern of how to safely migrating one database to another database without downtime. Since many people contacted me and asked for more details about it, I will describe it here in more details as promised. You can use this pattern to migrate ...

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