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Authentication-and-Authorization
user Authorization in mocroservices1. Single Sign onwhat is SSOSingle sign-on (SSO) allows the user to access multiple services without having to authenticate more than once.This is achieved by storing the user’s authentication information in a tr...…
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Async (@Async & messaging)
Async (@Async & messaging)Async programmingExample: suppose prepare the home page, we need 4 independent calls - userInfo(2s), AccountInfo(4s), BillingInfo(1s), UsageInfo(5s). If we execute synchoronously, we have to wait 12s, If we use Async,...…
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API GateWay
API GateWayWhy do we need API Gateway?API Gateway is a single entry point for all the microservices.Route requests This is convient for frontend developers to make requests to a single endpoint. The API Gateway will route the request to the approp...…
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Spring Profile and Jasypt
What annotation do you use to quickly switch between different environments to load different configurations?@Profile is used to quickly switch between different environments to load different configurations. Add @Profile annotation to the co...…
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Testing in Spring & Code Coverage
Testing in SpringUnit Test vs Integration TestUnit Test is a test focused on functional groups inside an application, generally we will test backend service layer by layer to make sure all layers and all methods work fine.Integration Test is a tes...…
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Spring Data Repository & JPA
JPA (Java Persistence API)JPA is a specification of Java. It is used to persist data between Java object and relational database. It doesn’t provide any implementation, so it need a provider to implement it like Hibernate, EclipseLink, TopLink, et...…
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RESTFul API
RESTFul APIWhat is RESTFul API (Application Programming Interface)?You can think of an API as a mediator between the users or clients and the resources or web services they want to get.What is REST?REST is an architectural style that defines a set...…
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REST Controller in Spring
REST Controller in Spring@RestController VS @Controller@RestController is a convenience annotation that combines @Controller and @ResponseBody. It is used for building RESTful web services that return data in response to HTTP requests in JSON/XML....…
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Srping Security and Authentication
Spring SecuritySpring Security introduction MoreSpring Security is a framework to protect our endpoints.talk about details how authentication and authorization works, login/ not login, permission/role, etc. (Interview question) user want to login...…
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Srping AOP
AOP - Aspect Oriented Programming1. What is AOP?AOP is used to separate functionalities that are not related to the core business logic. In another word, it is used to decouple cross-cutting concerns from the core business logic. (e.g. logging, ex...…
