Sometimes your system may display a message indicating how the ejb is called by the servlet. There can be several reasons for this error to appear.
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Import the EJB package by referring to the home bean as well as the remote interfaces.Displays a message generated by the servlet.Create an output string with a default error value.Use JNDI to find the EJB local space interface.Create a local bean from all local houses.
In this chapter, you will learn how to connect to Enterprise JavaBeans (EJBs) from servlets running in the OSE/OJVM servlet container.
How do you consume EJB?
If you are remote, download this particular oc4j file. jar file.If necessary, set up JNDI complexes for the connection.Define an InitialContextFactory for which you will use the connection.Retrieve the EJB using the JNDI name or the EJB probe configured in the mask descriptor.iva.
If you are calling a server bean from another client application, you must use a unique network protocol that includes an ORB, such as RMI over IIOP. However, calling from a servlet to help an external object running in the same session as the servlet can be much simpler and easier than calling from a client. When a servlet and another point are running on the same device, session, the connection between them does not use network traffic, but simply shares memory resources. Also, no ORBs are assigned, which simplifies calling code throughout the servlet. Just enter a call the object to search.
The remainder of this chapter documents a fantastic example showing how to call From ejb on a servlet in the mentioned Oracle Java Virtual Machine session.
In this example, ejb is querying my Oracle database to get the contractor ID of the employee, whose last name is usually passed to the EJB by the servlet. Thus, the whole example consists of four elements:
The example is kept simple so that you can clearly see the interaction of the four parts.
To compile and run the level, the Oracle9i server must be installed and running, and the sample HR schema must be reinstalled in the database. (HR scheme is preconfigured.)
How do you call EJB?
1 Right click on the MyAdditionEJB project and select Export -> Export as shown:2 Select EJB -> EJB Jar File as shown:3 Click Browse to select a location to save the JAR file (eg Desktop or C:Boost…).
The HR schema is not only available in the Oracle8i version 3 distribution. However, this example will work for Oracle8i (version 3). You modify this SQL statement in the EJB value to access the SCOTT.EMP table, and modify the batch makefile, or permanently access the SCOTT schema as an HR schema. A
The human example consists of two main pieces of code:
IDServlet.java– servlet code
IDServer/IDBean name="1001178">.java– EJB code
In addition, there are home and remote EJB specifications:
IDCommon/IDHome.java– interface for private households
Finally, each application that uses EJBs requires several guide files:
IDMap.xml– Oracle specific EJB descriptor color=”#330099″
The servlet is called by the client, e.g.web browser. The software should finally pass the employee to the servlet at the problem line. See Servlet Access for an example of the URL class you can use to call a servlet.
How do I access EJB from standalone application?
In client code, create an InitialContext instance:Find the home object in the customer’s discount code by simply entering the JNDI name of the specific home object.Specify the EJB system to access.
The servlet policy is listed in this section. The servlet takes the following steps:
- Import ordered Java packages, including home and remote EJB interfaces.
- Declare Java variables for the target name and for the bundle ID returned by a single bean.
- Get last name from query string.
- Retrieves the initially newly found context for the EJB call.
- Locate the EJB home interface using the post-bean publish name that appears in all JNDI namespaces. See (“
/test/idbean“, “Simple compilation and deployment of the example”).
- value=”6″>Creates a link to the remote user interface.
- The calls you see receive the
getID(String)EJB method withemployee ID number, passing in the last name obtained from part of the query string.
- value=”8″> Typically inserts an identification number into the output stream of an HTTP response.
How does EJB call work?
Imports the desired product.The bean implements a secret getID(String LastName) to get multiple IDs of the database server.The component system declares a JDBC conn connection, an arbitrary JDBC rset result set, in addition to an EmpID string for the appropriate ID.
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