There are many situations where a particular method needs to be executed at a time by just one thread or http request. For example it’s common that scheduled tasks in our project be executed at most once at the same time. If a task is being executed on one node…

Microservices architecture is very popular. But one of the main problems is how to manage distributed transactions across each microservices. In a monolith application, transactions handle in a single database. Transactions will be initiated at the database level and will be committed or rolled back based on the flow of…

What is OpenJPA? Apache OpenJPA is a Java persistence project at The Apache Software Foundation that can be used as a stand-alone POJO persistence layer or integrated into any Java EE compliant container and many other lightweight frameworks, such as Tomcat and Spring. [Reference] What is Oracle identity column? Oracle…

Feign is a declarative web service client. It makes writing web service clients easier. To use Feign, create an interface and annotate it. It has pluggable annotation support including Feign and JAX-RS annotations. Spring Cloud adds support for Spring MVC annotations and for using the same HttpMessageConverters used by default…