Software is made up of several lines of codes written in a particular programming language or a mix of one or more programming languages. After the making of the software, the software is tested and, then it is launched, sometimes it is available for free, but mostly it comes with a subscription package.
EJB (enterprise java bean), is developed by Sun Microsystems. It is referred to as a server-side component that manages the application’s security and provides a better environment for developing business-related applications and software. Message-driven, entity bean, and session bean are its categorizations.
EJB 2.0 vs EJB 3.0
The main difference between EJB 2.0 and EJB 3.0 is that EJB 2.0 is an older version of EJB 3.0 and, it contains many older functions that are of no use now. On the other hand, EJB 3.0 is the latest version of java bean and, there is no home interface in this IDE which makes it simpler than EJB 2.0.
EJB 2.0 was released in 2001 and designed by the java community process. This enterprise java bean was mainly created to generate applications related to business organizations. And this became the standard platform for developing distributed object-oriented applications that are written in java language associated with the business.
EJB 3.0 was released in 2006 and was a modified version of previous EJB versions. This version introduced annotations which means that some amount of short data or text can be added to the main code that is written in java. Previously deployment descriptors were used instead of annotations.
Comparison Table Between EJB 2.0 and EJB 3.0
| Parameters of Comparison | EJB 2.0 | EJB 3.0 |
| Interfaces | EJB 2.0 includes interfaces related to home and remote, and for that, there are separate deploy descriptors. | It does not include interfaces related to home and remote, and it uses annotations instead of deploy descriptors. |
| Database access | It uses a java EE component related to the server-side for acquiring user databases or information. | It has its application programming interface named java persistence for accessing the database. |
| Third-party plugins | EJB 2.0 does not offer many third-party plugins and is not very portable or flexible. | EJB 3.0 can be attached to any third-party plugin and, it offers flexibility. |
| Security issues | Issues related to security or hacking are handled by deploy descriptors. | Issues related to security or reliability depend on annotations. |
| Query | It does not support the EJB query language for writing queries for databases. | It supports enterprise java bean query language and is very flexible while using this language for writing database queries. |
What is EJB 2.0?
EJB 2.0 was the first application that used enterprise java bean structure to execute applications and web services or websites that uses the latest java language as its source code. This version uses large codes to write its home and remote interfaces, which were necessary to implement before any software execution.
EJB 2.0 uses tools from different suppliers and combines them to make distributed applications, which makes this version flexible and user-friendly. Earlier versions of EJBs were not much compatible with the existing system interface, but this version introduces compatibility with any system that can be extended according to users’ needs.
EJB 2.0 also introduced CMR concepts to its applications, which means it can also be used to maintain container-managed relationships that help to collect entity beans from the actual database.
What is EJB 3.0?
EJB 3.0 made everything easy by eliminating the EJB-jar.xml files and introducing the business interface and the entity bean class for easy access to the database. In this version of enterprise java bean, people can use POJOs that is plain old java object and does not require any defined classpath for reusability of the program.
EJB 3.0 manages its database using java persistence application programming interface and, therefore, there is no use of suppliers or vendors database mapping applications. Its container only contains client, business interface, an enterprise bean class which makes it simpler than EJB 2.0.
The interceptor methods can be executed more than once in this version of EJB and, the existing interceptor methods can be configured easily for all enterprise java beans that are inside the java-archive file.
Main Differences Between EJB 2.0 and EJB 3.0
- EJB 2.0 contains communication interfaces related to home and remote, and for that, there are separate deploy descriptors. Whereas EJB 3.0 does not include interfaces related to home and remote, and it uses annotations instead of deploy descriptors.
- EJB 3.0 has its application programming interface named java persistence for accessing the database. While EJB 2.0 uses a java EE component related to the server-side for acquiring user databases or information.
- EJB 3.0 can be attached to any third-party plugin and, it offers flexibility. Whereas EJB 2.0 does not offer many third-party plugins and is not very portable or flexible.
- EJB 3.0 supports enterprise java bean query language and is very smooth while using this language for writing database queries. While EJB 2.0 is not smooth with EJB query language for writing queries for databases.
- In EJB 2.0, Issues related to security or hacking are handled by deploy descriptors. Whereas, in EJB 3.0, issues related to unauthenticated access or security are handled by annotations.
Conclusion
There are so many websites that are big and contain tons of user data. These websites need constant maintenance because of the rush and, many people surf the same website at the same time. Therefore, software like java bean, spring framework, etc., is created for the website handlers for maintenance of these websites and for making these websites more secure.
Enterprise java bean is also helpful for business sector related people because it provides a clear logic for business applications, transaction processing services, and security for workers computers or laptops, etc. Many versions of enterprise java beans have been launched since 1998 and, it includes EJB1.0, EJB 1.1, EJB 2.0, EJB 2.1, EJB 3.0, EJB 3.1, EJB 3.2, EJB 3.2.6, and the latest release was EJB 4.0 that was released in 2020.
References
- http://www.inferdata.com/resources/whitepapers/ejb20whitepaper.pdf
- https://www.koreascience.or.kr/article/JAKO201219565295905.page