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Compiling and Running Java Without an IDE

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A recent Java subreddit thread called “Compiling Java Packages without IDE” posed the question, “is [there] a command that compiles a group of java files that are inside a package into a separate folder (let’s just call it bin), and how would I go about running the new class files?” The post’s author, kylolink, explains that “When I started out ...

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How to process stream and read text file in Java 8

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I have converted one of my old utility class using latest Java8. I use this often to print content of manifest file to check any mysterious jar file for version etc. Just run “java ztools.PrintJar /path/to/my.jar” to see output. In the new code, you will see how I use the Java 8 stream processing to filter what I need from ...

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How to implement a Session Timeout in Play Framework 2

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If you fol­low the Play Frame­work 2 guide for imple­ment­ing authen­ti­ca­tion: http://​www​.playframe​work​.com/​d​o​c​u​m​e​n​t​a​t​i​o​n​/​2​.​2​.​2​/​J​a​v​a​G​u​i​de4 — you will notice that there is no ses­sion time­out in Play Frame­work 2. It was there in Play Frame­work 1, but Play Frame­work 2 fol­lows a dif­fer­ent approach. I you want to imple­ment your own ses­sion time­out, then fol­low the guide for set­ting up authen­ti­ca­tion, by extend­ing ...

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Why Abstraction is Really Important

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Abstraction Abstraction is one of the key elements of good software design. It helps encapsulate behavior. It helps decouple software elements. It helps having more self-contained modules. And much more. Abstraction makes the application extendable in much easier way. It makes refactoring much easier. When developing with higher level of abstraction, you communicate the behavior and less the implementation.   ...

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Spring-boot and Scala

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There is actually nothing very special about writing a Spring-boot web application purely using Scala, it just works! In this blog entry, I will slowly transform a Java based Spring-boot application completely to Scala – the Java based sample is available at this github location – https://github.com/bijukunjummen/spring-boot-mvc-test To start with, I had the option of going with either a maven ...

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[Java] How to Schedule a task to run in an interval

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There is often need in application to run some particular task in background to accomplish some work in an interval. The example can be, service running in background for cleanup of application just like, we have the Java Garbage collection. In this article, i will show you 3 different ways to achieve this They are as follows using simple thread ...

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Domain-Driven Design Revisited

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Recently I read a book titled Domain-Driven Design by Eric Evans. This wasn’t the first time I read this book but this time I realized that I had been totally wrong about domain-driven design. I thought that the domain model consists of entities and value objects. In fact, I was obsessed with moving the domain logic to entities and value ...

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Five Funny Moments in Developer History

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I’ve been working in development environments my whole career, over 30 years. I started out sharing an office that actually had a door on it; yes, that was a really long time ago. I’ve gone from offices to cubes to open spaces. I’ve worked on really large teams, very small teams, and lots of medium-sized teams. I’ve also used waterfall, ...

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