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Understanding the first level JPA cache

java-interview-questions-answers

I can bet that every Java developer at least heard about L1 (aka EntityManager or Session) cache. But is your level of understanding it good enough? If you’re not sure, consider going through this post. At first, we need to know what the persistence context is. Following EntityManager JavaDoc we know, that: “A persistence context is a set of entity instances in which for ...

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Spring Batch Restartability

spring-interview-questions-answers

First of all, I’d like to give a big thank you to the wonderful folks from Spring who have given countless hours of their time to ensure the viability of Spring Batch jobs, and the seemingly magical ability to issue restart on a job! Thank you for this elegant toolset that permit us to tear through massive datasets, while enabling ...

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Grails Anti-Pattern: Everything is a Service

The context Grails makes it very easy to put any logic of your application in a service. Just grails create-service and you’re good to go. There’s a single instance by default, injectable anywhere. Powerful stuff and makes it easy to get up ‘n running very fast! Creating a new application, following so-called “best practices” from blogs like these and the ...

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Use Spring Cloud Config as externalized configuration

spring-interview-questions-answers

One of the most important practices when it comes to continuous delivery is building your binaries only once and use that one in the different environments (dev, test, acceptance, etc). This means that most likely you will need to externalize your configuration of your application. With Spring Boot applications it comes down to keep the values of your properties in ...

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How to Effectively Sweep Problems Under the Rug in Java

Because software bugs can make us appear bad as developers and lead to others thinking less of us, it is best to avoid writing bugs, to identify and fix bugs quickly, or to cover up our bugs. There are numerous blog posts and articles that discuss avoiding bugs and identifying and fixing bugs, so, in this blog post, I look ...

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Grails Anti-Pattern: Locally Optimized Dynamic Finders Everywhere

The context Grails makes it very easy to persist and find stuff using domain classes. It uses GORM (Grails’ Object Relational Mapping) under the hood, which by default uses Hibernate to map domain classes to tables in a database. Powerful stuff and makes it easy to get up ‘n running very fast! Creating a new application, following so-called “best practices” ...

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Testing the Java EE 8 Specifications

java-interview-questions-answers

The Java EE 8 Platform has definitely been moving along within the past couple of months.  Specifications have been releasing early draft reviews, milestones, and even final releases.  As a matter of fact, JSR-372 has just gone final, as JSF 2.3 has been released.  For more information, please see Arjan’s Post.  It had the privilege to be a part of ...

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