The subject of suitecrm encompasses a wide range of important elements. This tutorial is developed to provide a comprehensive understanding about the EJB concepts helpful to create and deploy an enterprise level application up and running. EJB - Overview - Online Tutorials Library. EJB provides an architecture to develop and deploy component based enterprise applications considering robustness, high scalability, and high performance. An EJB application can be deployed on any of the application server compliant with the J2EE 1.3 standard specification.
EJB - Create Application - Online Tutorials Library. Another key aspect involves, to create a simple EJB, we will use NetBeans "New" wizard. In the example given below, We will create a stateless EJB class named librarySessionBean under EjbComponent project. EJB - Message Driven Beans - Online Tutorials Library. A message driven bean is a type of enterprise bean, which is invoked by EJB container when it receives a message from queue or topic. Message driven bean is a stateless bean and is used to do task asynchronously.
EJB 3.0 is being a great shift from EJB 2.0 and makes development of EJB based applications quite easy. EJB stands for Enterprise Java Beans. EJB is an essential part of a J2EE platform. J2EE platform has component based architecture to provide multi-tiered, distributed and highly transactional features to enterprise level applications.
EJB - Access Database - Online Tutorials Library. Developers can access database using JDBC API call directly in EJB business methods. To demonstrate database access in EJB, we need to perform the following tasks −
EJB Container normally creates a pool of few stateless bean's objects and use these objects to process client's request. Because of pool, instance variable values are not guaranteed to be same across lookups/method calls. EJB Query Language is quite handy to write custom queries without worrying about underlying database details. Equally important, it is quite similar to HQL, hibernate query language and is often referred by the name EJBQL. To demonstrate EJB persistence mechanism, we need to do the following tasks − Step 1 − Create table in database. Step 2 − Create Entity class corresponding to table.
Step 3 − Create Data Source and Persistence Unit. Step 4 − Create a stateless EJB having EntityManager instance. Step 5 − Update stateless EJB.
📝 Summary
Understanding suitecrm is essential for individuals aiming to this field. The insights shared throughout serves as a solid foundation for deeper understanding.
Whether you're just starting, or well-versed, you'll find something new to learn about suitecrm.