JPA Specification
JPA (Java Persistence API) is a Java specification for managing relational data in Java applications. It allows to access and persist data between Java object/class and …
Maven BOM (Bill of Materials)
Maven tag <dependencyManagement> does not create dependencies, but informs of which dependency versions will be used in the project. Usually <dependencyManagement> is defined either in parent …
Java ThreadLocal
Java ThreadLocal class enables developer to create variables that can only be read and written by the same thread. Thus, even if two threads are executing …
Java Volatile Keyword
The Java volatile keyword guarantees visibility of changes to variables across threads. In a multithreaded applications, where the threads operate on non-volatile variables, each thread may …
Class initialization in Java
Class initialization means initializing all static members of the class. Class in Java is initialized when : An instance of the class is created using either …
Class Loaders in Java
Class loaders are responsible for loading Java classes during runtime dynamically to the JVM. They are part of JRE. JVM doesn’t need to know about the …
@RequestBody and @ResponseBody annotations
Simply put, the @RequestBody annotation maps the HttpRequest body to a transfer or domain object, enabling automatic deserialization of the inbound HttpRequest onto a Java object. The example …
CommandLineRunner and ApplicationRunner interfaces
Spring Boot provides two interfaces to run specific pieces of code when an application is fully started. These interfaces get called just before run() once SpringApplication …
Maven Dependency Scopes
Maven Dependency Scope attribute is used to specify the visibility of a dependency, relative to the different lifecycle phases (build, test, runtime etc). Maven provides six …
Building an Application with Spring Boot
To launch Spring Boot Application developer needs to do the following : Add dependencies provided by Spring Boot to a project. This can be done in …