7 Using an Embedded EJB Container in Oracle WebLogic Server
This chapter includes the following sections:
Overview of the Embeddable EJB Container
Unlike traditional Java EE server-based execution, embeddable container usage allows client code and its corresponding enterprise beans to run in a Java SE environment without having to deploy them to a Java EE server. This provides better support for testing, offline processing (e.g., batch jobs), and the use of the EJB programming model in desktop applications.
Most of the services present in the enterprise bean container in a Java EE server are available in the embedded enterprise bean container, including injection, container-managed transactions, and security. Enterprise bean components execute similarly in both embedded and Java EE environments, and therefore the same enterprise bean can be easily reused in both standalone and networked applications.
For a detailed example of using the Embedded EJB container in a Java SE environment, see EJB 3.1: Example of Using the Embeddable EJB Container in Java SE.
EJB Lite Functionality Supported in the Embedded EJB Container
The EJB Lite subset of the EJB 3.2 API is supported in the Embedded EJB Container. EJB Lite is by definition a subset of functionality and doesn't describe any new feature or functionality. This section outlines the requirements of EJB Lite support as defined by the EJB 3.2 specification.
Table 7-1 represents the official requirements for EJB Lite functionality support as defined by the EJB 3.2 specification.
Table 7-1 Requirements for EJB Lite vs. EJB 3.2 Full
| Requirements | EJB Lite | EJB 3.2 Full |
|---|---|---|
|
Components |
|
|
|
Session Beans (stateful, stateless, singleton) |
Yes |
Yes |
|
Message-Driven Beans |
No |
Yes |
|
2.x/1.1 CMP/BMP Entity Beans |
No |
Yes |
|
JPA 2.1 |
Yes |
Yes |
|
Session Bean Client Views |
|
|
|
Local/No Interface |
Yes |
Yes |
|
3.x Remote |
No |
Yes |
|
2.x Remote Home/Component |
No |
Yes |
|
JAX-WS Web Services Endpoint |
No |
Yes |
|
JAX-RPC Web Services Endpoint |
No |
Yes |
|
Services |
|
|
|
EJB Timer Service (non-persistent) |
Yes |
Yes |
|
Asynchronous Session Bean Invocations (local) |
Yes |
Yes |
|
Interceptors |
Yes |
Yes |
|
RMI-IIOP Interoperability |
No |
Yes |
|
Container-managed Transactions/Bean-managed Transactions |
Yes |
Yes |
|
Declarative and Programmatic Security |
Yes |
Yes |
|
Miscellaneous |
|
|
|
Embeddable API |
Yes |
Yes |