HowToDoInJava

Java 9 – Private Methods in Interface

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Java 9 onward, you are allowed to include private methods in interfaces. Using private methods, now encapsulation is possible in interfaces as well. In this java 9 tutorial, we will learn about interface private methods in detail. Table of Contents Interfaces till Java 7 Static and defaults methods since Java 8 Private methods since java […]

Spring Cloud – Create API Gateway with Netflix Zuul

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Learn to create load balancer using Netflix Zuul and its solid bonding with Spring Cloud. Here we will mainly concentrate on API gateway pattern and it’s usage. We will build a demo where we will create a microservice ecosystem and test its effectiveness and applicability of Zuul API gateway in the whole ecosystem.

Consul Service Registration and Discovery Example

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Learn to create Microservices, based on Spring cloud, registering on HashiCorp Consul registry server and how other microservices (discovery clients) use it to register and discover services to call their APIs.

How to Create and SSH Connect to AWS EC2 Instance

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EC2 stands for Elastic Compute Cloud and this is the backbone of AWS Infrastructure as a Service (IaaS) offering. In this tutorial, we will learn to create an EC2 instance from AWS console and also check how to connect EC2 from SSH client e.g. PuTTY installed in local machine. Table of Contents What is AWS […]

Spring Cloud Hystrix Circuit Breaker Pattern Example

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Learn to leverage the one of the Spring cloud Netflix stack component called Hystrix to implement circuit breaker while invoking underlying microservice. It is generally required to enable fault tolerance in the application where some underlying service is down/throwing error permanently, we need to fall back to different path of program execution automatically. This is […]

Spring Boot – Role Based Security with JAX-RS Annotations

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Learn to create JAX-RS 2.0 REST APIs using Spring Boot and Jersey framework, and add role based security using JAX-RS annotations e.g. @PermitAll, @RolesAllowed or @DenyAll. Table of Contents Project Structure Create REST APIs Secure REST APIs with JAX-RS Annotations Write security filter using JAX-RS ContainerRequestFilter Demo Project Structure The project structure of application created […]

Swagger2 – Spring REST Example

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Now a days REST and Microservices have got a lot of momentum. At the same time, actual REST specification does not suggest any standard way to document the REST APIs that we are going to expose [like WSDL for SOAP]. As a result, everybody is documenting their APIs in their own way, resulting a gap […]

How to Host Static Website or Content on AWS S3 Storage

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Learn about Amazon S3 (Simple Storage Service), creating a bucket in AWS S3 and then hosting static website or static contents in the storage area. Table of Contents What is AWS S3 Static Website Hosting with AWS S3 What is AWS S3 The Amazon S3 is a easy-to-use object store and one of the oldest […]

Spring Boot Jersey Example

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Learn to configure and create JAX-RS 2.0 REST APIs using Spring Boot and Jersey framework. This example application uses Jersey’s ServletContainer to deploy the REST APIs.

Spring Cloud Service Discovery with Netflix Eureka

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Learn to create microservice, based on Spring cloud, which act as Netflix Eureka registry server and how other microservices (Eureka clients) use it to register and discover services.

Spring Cloud Config Server with Git Integration

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Config server is where all configurable parameters of microservices are written are maintained. It is more like externalizing properties / resource file out of project codebase to an external service altogether, so that any changes to that property does not necessitate the deployment of service which is using the property. All such property changes will be reflected without redeploying the microservice.

Command Design Pattern

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Command pattern is a behavioral design pattern which is useful to abstract business logic into discrete actions i.e. commands. It motivates loose coupling.

Constructors in Java

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Java constructors are special methods (without return type) which allow you to fully initialize the object state before it can be used by other classes inside application. Constructors in java are invoked using new keyword.

Inheritance In Java with Examples

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Inheritance in java (IS-A relationship) is referred to the ability where child objects inherit or acquire all the properties and behaviors from parent object. In object oriented programming, inheritance is used to promote the code re-usability.

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