Blog Archives
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05. Spring Cloud routing with Netflix’s Zuul

Q. What is Netflix’s Zuul usecase in Micro Services Architecture? A. In a typical micro service architecture you have many micro services running on different hosts and ports. The challenge with this type of architecture is how different clients like browser based Web Applications, Mobile based apps, third-party apps, etc… …

06: Spring Cloud declarative REST client Feign

Q. What use Feign client?
A. Feign is a declarative web service client, which makes creation of web service clients a breeze.

1) Unlike a RestTemplate, Feign client acts as a load balancer. Spring Cloud integrates Netflix/ribbon and Netflix/eureka to provide a load balanced http client when using Feign.…

07: Spring Cloud with Resilience4j CircuitBreaker

Q. What is Resilience4j?
A. Resilience4j is a fault-tolerance library implementing the Circuit Breaker pattern inspired by Netflix Hystrix, but offers a more convenient API and a number of other features like Rate Limiter to block too many frequent requests to some services, Bulkhead to limit the number of concurrent …

08: Spring boot with OpenAPI (Swagger) tutorial

This tutorial extends Create a simple REST API with Spring Boot.

Q1. What is Swagger?
A1. The OpenAPI (used to be called Swagger) automates the documentation of REST APIs. Documentation of any REST Service API is a must because

1) Consumers of the services need to know …

Basic Spring batch tutorial with Maven and Eclipse.

Batch jobs with Spring batch framework is very common and popular. This tutorial assumes that

1) You have set up you Java, Maven, and Eclipse

Once you have followed the following steps, you should have a project structure as shown below.


Step 1: Create a new Maven project with the …

CDI annotations @Named and @Inject Dependency Injection in Spring 3.0 Tutorial

In Spring 3.0 the support for the CDI annotations @Named and @Inject are provided.

1) @Inject instead of Spring’s @Autowired to inject a bean.
2) @Named instead of Spring’s @Component to declare a bean.

Step 1: Create a simple Maven project. Just press enter for all the prompts.

Hibernate Query Language (HQL) tutorial

Step 1: The ER diagram showing the relationships among the tables. The column names and types are omitted to keep it simple. Step 2: The basic table details. The UserApp table uses “UserName” and “AppCd” as the primary key. It links to the User table using the “UserName”. “UserName” is… …

Hibernate tutorial with HSQLDB

This tutorial is basically an extension to the “Setting up” Java” and “JDBC tutorials”. Hibernate is an ORM (Object to Relational Mapping) tool. Step 1:  First step is to bring in the relevant Hibernate framework jar files like hibernate-xxx.jar, hibernate-annotations-xxxx.jar, and other dependent jar files that are transitively brought in… …

JAXB with Spring ORM for marshaling tutorial

This extends Basic JAXB tutorial with Maven & XSD – 1 to marshall with Spring OXM and Spring XML.

Right mouse click on target/generated-sources and select “Build Path –> Use as Source Folder

Step 1: add spring-orm to use JAXB and spring-xml to use StringResult.

JAXB with Spring ORM for unmarshaling tutorial

This extends Basic JAXB tutorial with Maven & XSD – 1 to unmarshal with Spring OXM and Spring XML.

The Spring & JAXB marshaling tutorial used XML based config to inject the “jaxb2Marshaller”, but in this to make things a bit more interesting, let’s use “Java” class based Spring configuration …

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Java developer & architect Q&As

Java developers Q&As