EJB 2.0 and EJB 3.0 are both Java Enterprise Edition (JEE) technologies used for developing enterprise applications. Though they share the same name, they are actually quite different. In this blog post, we’ll take a look at the key differences between EJB 2.0 and EJB 3.0. Keep in mind that this is just a high-level overview – for more details, be sure to check out the official documentation from Oracle.
What is EJB 2.0?
EJB 2.0 is a specification for enterprise JavaBeans. EJBs are components that run in environments that provide support for transactions, security, scalability, and other services. EJB 2.0 was released in 2001 and updated in 2006. It is the most recent version of the EJB specification.
EJB 2.0 includes support for container-managed transactions, message-driven beans, and XML-based Web services. EJB 2.0 is compatible with earlier versions of EJBs. EJB 3.0 was released in 2009 and is the most recent version of the EJB specification. It includes significant changes from previous versions, such as support for annotations and a simplified programming model. EJB 3.0 is not backward-compatible with EJB 2.0.
What is EJB 3.0?
EJB 3.0 is the latest version of the Enterprise JavaBeans specification. EJB is a component architecture for building distributed, transactional, and security-oriented applications. The EJB specification defines a set of standard interfaces and classes that can be used to develop EJB components. EJB 3.0 simplifies the development of EJB components by reducing the amount of code that needs to be written.
In addition, EJB 3.0 introduces several new features, including dependency injection and annotation-based programming. These new features make it easier to develop and deploy EJB components. As a result, EJB 3.0 is a significant improvement over previous versions of the EJB specification.
Difference Between EJB 2.0 and EJB 3.0
EJB 3.0 was released in 2006, with the intention of simplifying the development process and making EJBs more lightweight. As a result, many of the features that were present in EJB 2.0 were removed or simplified. For example, EJB 3.0 no longer requires the use of home and remote interfaces, nor does it require developers to write boilerplate code for session beans.
In addition, EJB 3.0 annotations can be used to simplify the mapping of entities to database tables. Finally, EJB 3.0 introduced the concept of dependency injection, which further reduces the amount of code that needs to be written. While EJB 2.0 is still supported by most application servers, EJB 3.0 is now the standard for enterprise Java development.
Conclusion
In conclusion, EJB 3.0 has a simplified development process and improved performance when compared to EJB 2.0. However, there are still some areas that need improvement such as security and scalability.
