Ejb-jar.xml

[Elwanda Menhennett]

Iam looking to add an interceptor class to an EJB.According to my understanding I need to add a few tags to my ejb-jar.xml file to intercept all incoming requests.Is there any documentation out there that can give me a full list of different tags I can put in the ejb-jar.xml file?

I do not see any problem with "maven-ejb-plugin" 2.5.1 version it seems to be working fine. The only thing you need to remember that you should place your ejb-jar.xml inside the "$EJB_Project/src/main/resources/META-INF" directory something like following:

Does someone one have a simple explaination w/example showing how to setup the jboss.xml from an ejb-jar.xml? I find nothing on JBOSS or Goggle? Specifically I'm looking for the enterprise beans and resource section. Below is the contents of my ejb-jar.xml.

I have attached several files that I hope will provide someone with the insight to assist. I'm trying to access an EJB in a jar file from MyEclipse(I believe I would have the same problem from eclipse). The heart of the matter(I believe) can be found in the log from the server where the ejb-jar.xml and jboss.xml won't synch and therefore when I try to execute CalculationAppealsManager ejb = EJBFactory.getCalculationAppealsManager() it fails since JBOSS wasn't able to connect to the EJB. I've tried many different things but to no avail. I'm not ashamed to say that some of this is lack of EJB/JBOSS knowledge. I'm a developer, not a systems guy and my Enterprise Java is extremely rusty(been in the c#.net world for several years). Any assistance would be appreciated.

Been a while since I posted but I still have the same problem and find very little on the internet to assist. If I create my own enterprise java bean from source code using Xdoclet to assist the jar does deploy. I match the jboss.xml from the successful deploy

How can I configure my application to use the annotations where present and use the ejb-jar.xml file only for stuff thats configured inside it. As far as I understood the documentation, this should be the normal case anyway.

The beans.xml is not needed for this at all. It is required for enabling CDI (which you don't need if you only refer to your beans from other beans), have a look at this post about what it is and when you need it.

The following sections describe the EJB 2.0 deployment descriptor elements found in the weblogic-ejb-jar.xml file, the weblogic-specific XML document type definitions (DTD) file. Use these definitions to create the WebLogic-specific weblogic-ejb-jar.xml file that is part of your EJB deployment.

The EJB deployment descriptors contain structural and application assembly information for an enterprise bean. You specify this information by specifying values for the deployment descriptors in three EJB XML DTD files. These files are:

The ejb-jar.xml file is based on the deployment descriptors found in Sun Microsystems's ejb.jar.xml file. The other two XML files are weblogic-specific files that are based on the deployment descriptors found in weblogic-ejb-jar.xml and weblogic-cmp-rdbms-jar.xml.

When you edit or create XML deployment files, it is critical to include the correct DOCTYPE header for the deployment file. In particular, using an incorrect PUBLIC element within the DOCTYPE header can result in parser errors that may be difficult to diagnose.

WebLogic provides a public location for you to access the correct text for the WebLogic Server-specific DTD file, weblogic-ejb-jar.xml. However, an identical version of this DTD file is embedded in WebLogic Server for internal use. weblogic.appc uses this file when the XML parser checks the sequence of the deployment descriptors files.

The contents and arrangement of elements in your XML files must conform to the Document Type Definition (DTD) for each file you use. WebLogic Server ignores the DTDs embedded within the DOCTYPE header of XML deployment files, and instead uses the DTD locations that were installed along with the server. However, the DOCTYPE header information must include a valid URL syntax in order to avoid parser errors.

Note: Most browsers do not display the contents of files having the .dtd extension. To view the DTD file contents in your browser, save the links as text files and view them with a text editor.

The allow-concurrent-calls element specifies whether a stateful session bean instance allows concurrent method calls. By default, allows-concurrent-calls is False. However, when this value is set to True, the EJB container blocks the concurrent method call and allows it to proceed when the previous call has completed.

The cache-between-transactions element applies only to entity beans. When it is set to True, WebLogic Server assumes that EJB data can be modified between transactions and reloads the data at the beginning of each transaction. When set to False, WebLogic Server assumes that it has exclusive access to the EJB data in the persistent store.

The clients-on-same-server attribute determines whether WebLogic Server sends JNDI announcements for this EJB when it is deployed. When this attribute is "False" (the default), a WebLogic Server cluster automatically updates its JNDI tree to indicate the location of this EJB on a particular server. This ensures that all clients can access the EJB, even if the client is not collocated on the same server.

You can set clients-on-same-server to True when you know that all clients that will access this EJB will do so from the same server on which the bean is deployed. In this case, a WebLogic Server cluster does not send JNDI announcements for this EJB when it is deployed. Because JNDI updates in a cluster utilize multicast traffic, setting clients-on-same-server to True can reduce the startup time for very large clusters.

The confidentiality element specifies the transport confidentiality requirements for the EJB. Using the confidentiality element ensures that the data is sent between the client and server in such a way as to prevent other entities from observing the contents.

The connection-factory-jndi-name element specifies the JNDI name of the JMS ConnectionFactory that the MessageDriven Bean should look up to create its queues and topics. If this element is not specified, the default is the weblogic.jms.MessageDrivenBeanConnectionFactory in config.xml.

Set the delay-updates-until-end-of-tx element to True (the default) to update the persistent store of all beans in a transaction at the completion of the transaction. This setting generally improves performance by avoiding unnecessary updates. However, it does not preserve the ordering of database updates within a database transaction.

If your datastore uses an isolation level of TransactionReadCommittedUncommitted, you may want to allow other database users to view the intermediate results of in-progress transactions. In this case, set delay-updates-until-end-of-tx to False to update the bean's persistent store at the conclusion of each method invoke. See ejbLoad() and ejbStore() Behavior for Entity EJBs for more information.

Note: Setting delay-updates-until-end-of-tx to False does not cause database updates to be "committed" to the database after each method invoke; they are only sent to the database. Updates are committed or rolled back in the database only at the conclusion of the transaction.

ejb-name specifies the name of an EJB to which WebLogic Server applies isolation level properties. This name is assigned by the ejb-jar file's deployment descriptor. The name must be unique among the names of the enterprise beans in the same ejb.jar file. The enterprise bean code does not depend on the name; therefore the name can be changed during the application-assembly process without breaking the enterprise bean's function. There is no built-in relationship between the ejb-name in the deployment descriptor and the JNDI name that the deployer will assign to the enterprise bean's home.

If you set enable-call-by-reference to False, parameters to the EJB methods are copied (pass-by-value) in accordance with the EJB 1.1 specification. Pass by value is always necessary when the EJB is called remotely (not from within the server).

The entity-cache-name element refers to an application level entity cache that the entity bean uses. An application level cache is a cache that may be shared by multiple entity beans in the same application.

The entity-cache-ref element refers to an application level entity cache which can cache instances of multiple entity beans that are part of the same application. Application level entity caches are declared in the weblogic-application.xml file.

Use the concurrency-strategyto define the type of concurrency you want the bean to use. The concurrency-strategy must be compatible with the application level cache's caching strategy. For example, an Exclusive cache only supports banes with a concurrency-strategy of Exclusive. While a MultiVersion cache supports the Database, ReadOnly, and Optimistic concurrency strategies.

For example, suppose bean A ad bean B share a cache, called AB-cache, that has a size of 1000 bytes and the size of A is 10 bytes and the size of B is 20 bytes, then the cache can hold at most 100 instances of A and 50 instances of B. If 100 instance s of A are cached, this implies that 0 instances of B are cached.

The finders-load-bean element determines whether WebLogic Server loads the EJB into the cache after a call to a finder method returns a reference to the bean. If you set this element to True, WebLogic Server immediately loads the bean into the cache if a reference to a bean is returned by the finder. If you set this element to False, WebLogic Server does not automatically load the bean into the cache until the first method invocation; this behavior is consistent with the EJB 1.1 specification.

home-call-router-class-name specifies the name of a custom class to use for routing bean method calls. This class must implement weblogic.rmi.extensions.CallRouter(). If specified, an instance of this class is called before each method call. The router class has the opportunity to choose a server to route to based on the method parameters. The class returns either a server name or null, which indicates that the current load algorithm should select the server.

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