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Tag Archives: Spring

Understanding Callable and Spring DeferredResult

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1. Introduction Asynchronous support introduced in Servlet 3.0 offers the possibility to process an HTTP request in another thread. This is specially interesting when you have a long running task, since while another thread processes this request, the container thread is freed and can continue serving other requests. This topic has been explained many times, but there seems to be ...

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Throttle methods with Spring AOP and Guava rate limiter

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External services or APIs may have usage limits or they just cannot handle loads of requests without failing. This post explains how to create a Spring Framework based aspect that can be used to throttle any adviced method calls with Guava’s rate limiter. The following implementation requires Java 8, Spring AOP and Guava. Let’s start with an annotation that is ...

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Learning Spring-Cloud – Writing a microservice

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Continuing my Spring-Cloud learning journey, earlier I had covered how to write the infrastructure components of a typical Spring-Cloud and Netflix OSS based micro-services environment – in this specific instance two critical components, Eureka to register and discover services and Spring Cloud Configuration to maintain a centralized repository of configuration for a service. Here I will be showing how I ...

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Spring Batch – Replacing XML Job Configuration With JavaConfig

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I recently assisted a client in getting up and running with a Spring Batch implementation. The team had decided to move forward with a JavaConfig-based configuration for their batch jobs instead of the traditional XML-based configuration. As this is becoming a more common approach to configuring Java applications, I felt it was time to update Keyhole’s Spring Batch series to show you how ...

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A Developers Perspective on Spring vs JavaEE

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In Java community Spring vs JavaEE is a never ending debate. In such debates people form two groups consisting of evangelists, architects and hard core fans of one platform and debate endlessly. Those who participate in the debates may be architects who are responsible for platform selection. But what would developers think about this Spring vs JavaEE debate? I am ...

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Learning Spring-Cloud – Infrastructure and Configuration

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I got a chance to play with Spring-Cloud to create a sample set of cloud ready microservices and I am very impressed by how Spring-Cloud enables different infrastructure components and services to work together nicely. I am used to creating microservices based on Netflix OSS based stack and typically in a Netflix stack Eureka is considered the hub using which ...

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JavaEE or Spring? Neither! We Call Out For a Fresh Competitor!

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If you’ve been following some key Java people on Twitter or reading the “news” on Reddit, you could not have missed the hilarious “bitch fight” (pardon my French) between some Spring and JavaEE evangelists. First, Jürgen Höller’s provocative article: “Happy second birthday, Java EE 7! How is it going in production?” Then, Reza Rahman’s response: “The Ghosts of Java EE ...

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RESTful Error Handling with Spring

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This post will illustrate a way in which exception handling can be implemented for RESTful web services in Spring in such a manner that the exception handling concerns are separated from the application logic. Taking advantage of the @ControllerAdvice annotation we are able to create a global helper class for all controllers. By adding methods that we annotate with both ...

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Groovier Spring Boot Integration Testing

spring-interview-questions-answers

Recently I had a chance to use Groovy’s groovy.json.JsonSlurper in a soapUI REST project. The usage scenario in soapUI (in particular, soapUI Open Source) was very simple: in a Groovy assertion, load the content of a response into a variable and than verify it like this: import groovy.json.JsonSlurper; def slurper = new JsonSlurper() def result = slurper.parseText(messageExchange.responseContent) assert result.incidentType == ...

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Akka samples with scala and Spring

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I was looking around recently for Akka samples with Spring and found a starter project which appeared to fit the bill well. The project however utilizes Spring-Scala which is an excellent project, but is no longer maintained. So I wanted to update the sample to use core Spring java libraries instead. So here is an attempt on a fork of ...

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