Posted On: Apr 07, 2020
JPA or Java Persistence API is a mechanism through which JAVA can outlive the application processes that have created them. JPA allows you to define which objects are persisted and how they should be persisted in the Java applications. At first, JPA was introduced as an EJB 3.0 subset. Every EJB container contains a persistent layer that is defined by the JPA.
Junit can be defined as the open-source framework for unit testing in Java. It is an example of xUnit architecture. Junit identifies the bugs in the code much early that makes them more trustworthy. It is ideal for developers working in a test-driven environment.
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Singleton class in Java contains only one object at one time. For the designing of the singleton class, the construction needs to be private. The static method needs to be written to return the object...
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