Openejb :: container :: core framework and other Java class libraries

OpenEjb is a container for constructing a Java EE application. It provides some core frameworks and other Java class libraries, which can be used to compare and select.This article will introduce the core framework of OpenEjb and the comparison and choice with other Java class libraries. 1. Openejb core framework 1. Container Engine: OpenEjb uses a container engine to manage and run components in the application, including EJB (Enterprise Java Bean), Servlet, and JPA (Java Persistence API).The container engine implements functions such as life cycle management, transaction support, and concurrency control of these components. 2. Configuration System: OpenEjb provides a flexible configuration system that can set the attributes and behaviors of containers and components by configure files or programming.This allows developers to finely configure and adjust applications. 3. Dependency Injection: OpenEjb supports dependency injection, which can automatically inject the dependency in the component through annotation or XML configuration.This can effectively reduce the redundancy of the code and provide better testability and flexibility. 4. Transaction Management: OpenEjb provides powerful transaction management functions that can control the EJB method, service request and JPA operation.It supports declaration and programming transaction management, and seamlessly integrates frameworks such as JTA (Java Transaction API) and JPA. 5. Security Management: OpenEjb provides scalable security management mechanisms that can perform permissions control and identity authentication on applications.It supports role -based access control and annotation -driven certification. 2. Comparison and choice with other Java libraries 1. Spring Framework: OpenEjb and Spring Framework are both frameworks used to build Java applications.They have some similar functions, such as dependency injection and transaction management.Which framework to choose depends on the preferences and needs of individual or team.If you are familiar with Spring and have used other Spring functions, you can choose to continue using Spring.However, if you pay more attention to the implementation of lightweight and pure Java EE standards, then OpenEjb may be more suitable for you. Below is a simple example of using OpenEjb: import javax.ejb.Stateless; import javax.ejb.LocalBean; @Stateless @LocalBean public class MyBean { public String helloWorld() { return "Hello, World!"; } } 2. Hibernate: Hibernate is a popular Java ORM (object relationship mapping) framework, which is used to map the Java object to the database.Openejb and Hibernate can be used well.When database access is required, Hibernate can be used as the implementation of the durable layer, and OpenEjb is responsible for managing transactions and containers.This combination can provide better maintenance and scalability. The above is some brief descriptions about the comparison and choice of the OpenEjb framework and other Java class libraries.According to the needs and preferences of individuals or teams, you can choose a framework suitable for your own project.I hope this article will help you.