My Review of Vlad Mihalcea’s High-Performance Java Persistence book

In Java world, JPA/Hibernate is the most popular and widely used framework. When it comes to overall performance of a software system database persistence layer plays the crucial role. The tricky part with JPA/Hibernate is it is very easy to get started but very very hard to master. This is where Vlad Mihalcea‘s High-Performance Java Persistence book helps you a lot. The High-Performance Java Persistence book is not just another Hibernate book saying you put this annotation here and call that method there and you are done. […]

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Select ALL starters on Spring Initializer (http://start.spring.io)

If you are working on Spring Boot then you most probably aware of Spring Initializer (http://start.spring.io) which is an online spring boot application generator. You can select the starters that you want to use and then generate the application. If you notice that there is no SELECT ALL option to select all the starters. Who would do that insane thing of selecting all the starters for an application??!!??? But, i would like to have the SELECT ALL option for one single reason: […]

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Spring Cloud Tutorials – Auto Refresh Config Changes using Spring Cloud Bus

Problem In the previous article Introduction to Spring Cloud Config Server we have seen how to use Spring Cloud Config Server. But, the problem is to reload the config changes in Config Client applications we need to trigger /refresh endpoint manually. This is not practical and viable if you have large number of applications. Solution Spring Cloud Bus module can be used to link multiple applications with a message broker and we can broadcast configuration changes. […]

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Spring Cloud Tutorials – Introduction to Spring Cloud Config Server

Problem SpringBoot provides lot of flexibility in externalizing configuration properties via properties or YAML files. We can also configure properties for each environment (dev, qa, prod etc) separately using profile specific configuration files such as application.properties, application-dev.properties, application-prod.properties etc. But once the application is started we can not update the properties at runtime. If we change the properties we need to restart the application to use the updated configuration properties. […]

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Getting Started with SpringBoot in Intellij IDEA Community Edition

We can use Intellij IDEA Community Edition for working with SpringBoot applications as we don’t need support for configuring servers like Tomcat, Wildlfy etc and can simply run the applications by running main() method. However, there is no provision in Intellij IDEA Community Edition to create SpringBoot application directly, the way it supports in Ultimate Edition. We can go to http://start.spring.io/ and generate the project and then import into our IDE. […]

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Update on SpringBoot : Learn By Example book

I would like to let you know that I have updated/added the following sections to my SpringBoot : Learn By Example book. Additions to existing chapters: Working with Multiple Databases Exposing JPA entities with bi-directional references through RESTful services In some of our applications we need to work with multiple databases. For example, we may have a primary database and a reporting database where most the application uses primary database and the application reports will be generated out of reporting database data. […]

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How to fix “vt-x is disabled in the bios” error?

If you face the “vt-x is disabled in the bios” error while trying to run Android emulator, here is the solution that worked for me. Step 1: Enable Virtualization Technology in BIOS Go to BIOS Setup and enable “Virtualization Technology” option. On my Lenovo laptop this option was already enabled, but still getting this error. I have disabled it and re-enabled it, then it is working. Step 2: Install HAXM Installer from Android SDK Manager Start the Android SDK Manager, select Extras -> Intel x86 Emulator Accelerator (HAXM Installer) and install it. […]

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My New Book SpringBoot : Learn By Example Published Today

I am happy to announce that my new book SpringBoot : Learn By Example got published today on Leanpub. SpringBoot : Learn By Example   What is SpringBoot? Spring is one of the most popular Java frameworks out there to build web and enterprise application. Spring supports variety of configuration approaches (XML, Annotations, JavaConfig etc) and properly configuring Spring applications become a bit tedious and repetitive process. To avoid these problems Spring team introduced SpringBoot to address the complexity of configuring Spring application. […]

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My Review of Sanjay Patel’s Spring Course

Spring is the most popular Java framework for building web and enterprise applications. There are plenty of official documentation, books, and Training Courses available for Spring framework on web. I got an opportunity to review Sanjay Patel‘s Spring Course Material which is divided into 3 modules. http://www.naturalprogrammer.com/spring-tutorial/ The total course is divided into 3 modules covering various aspects of web application development using Spring/SpringBoot framework. Module I : Spring Framework 4 And Dependency Injection For Beginners Module II : Spring Framework for the Real World Module III : Spring Framework REST API Development Module I: Spring Framework 4 and Dependency Injection For Beginners […]

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Creating Custom SpringBoot Starter for Twitter4j

SpringBoot provides lot of starter modules to get up and running quickly. SpringBoot’s auto-configure mechanism takes care of configuring SpringBeans on our behalf based on various criteria. In addition to the springboot starters that comes out-of-the-box provided by Core Spring Team, we can also create our own starter modules. In this post we will look into how to create a custom SpringBoot starter. To demonstrate it we are going to create twitter4j-spring-boot-starter which will auto-configure Twitter4J beans. […]

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