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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...…
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Transactions in Spring (monolithic)
Transactions in Spring (monolithic)1. TransactionTransaction represents a single unit of work. The ACID properties define transactional requirements. Atomicity: All operations within the transaction must succeed or fail as a unit. If failed, ...…
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Common Annotations in Spring
Common Annotations in Spring@Component & @Repository & @Service @Component: generic annotation, Spring will automatically detect and register it as a bean @Repository: used to annotate DAO class, subclass of @Component. It is u...…
