The AccessTimeout annotation interface, which was introduced in the Java 6 specification, is the standard way to specify container managed concurrency for stateful session beans. The following example shows how to specify that the container should block a new request for 2 seconds before timing out when a bean is currently processing a request.
The following example shows how to tell the container to block a request to a bean indefinitely until the current request completes. Summary The weblogic-ejb-jar. Map weblogic-ejb-jar. To prohibit concurrent access, set the AccessTimeout value to zero. SECONDS The following example shows how to tell the container to block a request to a bean indefinitely until the current request completes.
Here are the common uses of Markdown. Use this element instead of global-role, which has been deprecated and was removed from WebLogic Server in release 9. 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. The global-role element is deprecated and was removed from WebLogic Server in release 9.
Use the externally-defined element instead. Specifies the name of a custom class to use for routing bean method calls. This class must implement weblogic. 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. See entity-clustering and stateful-session-clustering.
Calls to the home stub are load-balanced between the servers on which this bean is deployed, and if a server hosting the bean is unreachable, the call automatically fails over to another server hosting the bean. Default value: Value of weblogic. Specifies the algorithm to use for load balancing between replicas of the EJB home in a cluster.
If this element is not defined, WebLogic Server uses the algorithm specified by the server element, weblogic. Defines list of methods of a clustered EJB which are written in such a way that repeated calls to the same method with the same arguments has exactly the same effect as a single call. This allows the failover handler to retry a failed call without knowing whether the call actually compiled on the failed server.
When you enable idempotent-methods for a method, the EJB stub can automatically recover from any failure as long as it can reach another server hosting the EJB. Clustering must be enabled for the EJB. To enable clustering, see entity-clustering, stateful-session-clustering, and stateless-clustering. The methods on stateless session bean homes and read-only entity beans are automatically set to be idempotent.
It is not necessary to explicitly specify them as idempotent. Range of values: 1 to maxSeconds , where maxSeconds is the maximum value of an int. Defines the maximum length of time an EJB should remain in the cache. After this time has elapsed, WebLogic Server removes the bean instance if the number of beans in cache approaches the limit of max-beans-in-cache. The removed bean instances are passivated.
Also defines the maximum length of time an EJB should remain idle in the free pool before it is removed. After this time has elapsed, WebLogic Server removes the bean instance from the free pool so long as doing so will not cause the number of beans in the pool to fall below the number specified in initial-beans-in-free-pool.
Although idle-timeout-seconds appears in the entity-cache element, WebLogic Server 8. The following entry indicates that the stateful session EJB, AccountBean , should become eligible for removal if max-beans-in-cache is reached and the bean has been in cache for 20 minutes:. Specifies security configuration parameters at the bean level. If you specify a value for initial-beans-in-free-pool , you set the initial size of the pool. WebLogic Server populates the free pool with the specified number of bean instances for every bean class at startup.
Populating the free pool in this way improves initial response time for the EJB, because initial requests for the bean can be satisfied without generating a new instance. Specifies the initial context factory used by the JMS provider to create initial context. Specifies the transport integrity requirements for the EJB.
Using the integrity element ensures that the data is sent between the client and server in such a way that it cannot be changed in transit. The specified method must return a boolean value. Providing a method and setting it as appropriate can improve performance for EJB 1.
However, any errors in the method's return value can cause data inconsistency problems. However, it still applies to BMP and 1. When you deploy EJB 2. TransactionSerializable —Simultaneously executing this transaction multiple times has the same effect as executing the transaction multiple times in a serial fashion. This is because Oracle databases do not lock read data at the TransactionSerializable isolation level. Additionally, at the TransactionSerializable isolation level, it is possible for concurrent transactions on Oracle databases to proceed without throwing the Oracle exception ORA " can't serialize access for this transaction ".
TransactionReadCommitted —The transaction can view only committed updates from other transactions. TransactionReadUncommitted —The transaction can view uncommitted updates from other transactions. TransactionRepeatableRead —Once the transaction reads a subset of data, repeated reads of the same data return the same values, even if other transactions have subsequently modified the data.
This causes the secluded rows to be locked for update. If the Oracle database cannot lock the rows affected by the query immediately, then it waits until the rows are free.
This causes the selected rows to be locked for update. Refer to your database documentation for more information on support for different isolation levels.
Required for durable subscriptions to JMS topics. Specifies the number of seconds between each attempt to reconnect to the JMS destination. Each message-driven bean listens on an associated JMS destination.
Once the JMS Server is up again, the message-driven bean can again receive messages. When applied to a bean class to indicate the JNDI name of a no-interface view, the className is optional.
See resource-description and ejb-reference-description. The jndi-name element is deprecated in this release of WebLogic Server. Use jndi-binding instead. Assigning a JNDI name to a bean is not recommended. Global JNDI names generate heavy multicast traffic during clustered server startup. The local-jndi-name element is deprecated in this release of WebLogic Server. JNDI name for a bean's local home.
If a bean has both a remote and a local home, then it can be assigned two JNDI names; one for each home. Specifies the maximum number of objects of this class that are allowed in memory. WebLogic Server maintains a free pool of EJBs for every entity bean, stateless session bean, and message-driven bean class.
The max-beans-in-free-pool element defines the size of this pool. Maps a message destination reference in the ejb-jar. Range of values: A valid message destination reference name from the ejb-jar. Requirements: This element is required if the EJB specifies messages destination references in ejb-jar. Specifies the name of a message destination reference.
This is the reference that the EJB provider places within the ejb-jar. Specifies the EJB interface to which WebLogic Server applies isolation level properties, if the method has the same signature in multiple interfaces.
Range of values: Name of an EJB defined in ejb-jar. If you specify a method-name , the method must be available in the specified ejb-name. The method-params element contains one or more method-param elements, as shown here:. Assigns a custom network channel that the EJB will use for network communications. A network channel defines a set of connection attributes.
The passivate-as-principal-name element, introduced in WebLogic Server 8. The passivate-as-principal-name element only needs to be specified if operations within ejbPassivate require more permissions than the anonymous principal would have. This element affects the ejbPassivate methods of stateless session beans when passivation occurs due to a cache timeout.
See also remove-as-principal-name, create-as-principal-name, and principal-name. Required only for entity EJBs that use container-managed persistence services. The persistence element defines the following options that determine the persistence type, transaction commit behavior, and ejbLoad and ejbStore behavior for entity EJBs in WebLogic Server:.
The persistence-use element stores an identifier of the persistence type to be used for this particular bean. Specifies a file system directory where WebLogic Server stores the state of passivated stateful session bean instances.
Specifies the name of a persistent store on the server's file system where WebLogic Server stores timer objects. If you do not specify a persistent store name in this element, WebLogic Server stores timer objects in the default store. The options are:. Specifies the name of an actual WebLogic Server principal to apply to the specified role-name. At least one principal-name is required in the security-role-assignment element.
You may define more than one principal-name for each role-name. Range of values: 0 to maxSeconds , where maxSeconds is the maximum value of an int. Specifies the number of seconds between ejbLoad calls on a Read-Only entity bean. A value of 0 causes WebLogic Server to call ejbLoad only when the bean is brought into the cache. The following entry causes WebLogic Server to call ejbLoad for instances of the AccountBean class only when the instance is first brought into the cache:.
Specifies the length of time that a remote RMI client will wait before it will time out. This parameter only needs to be specified if operations within ejbRemove need more permissions than the anonymous principal would have. The remove-as-principal-name element, introduced in WebLogic Server 8. The remove-as-principal-name element only needs to be specified if operations within ejbRemove require more permissions than the anonymous principal would have.
This element effects the ejbRemove methods of stateless session beans and message-drive beans. See also passivate-as-principal-name, create-as-principal-name, and principal-name.
If you select None , the state is not replicated. Range of values: A valid resource environment reference name from the ejb-jar. Range of values: A valid resource reference name from the ejb-jar. Specifies the name of a resourcefactory reference. Required element if the EJB specifies resource references in ejb-jar. Maps a resource reference defined in ejb-jar. Maps a resource environment reference defined in ejb-jar.
While it is possible to set this value to less than or equal to 0, Oracle recommends that you do not do so because the EJB container will not retry transactions when this value is not greater than or equal to 1. Specifies the number of times you want the EJB container to automatically retry a container-managed transaction method that has rolled back. Specifies the methods for which you want the EJB container to automatically retry container-managed transactions that have rolled back.
Automatic transaction retry is supported for session and entity beans that use container-managed transaction demarcation. Additionally, regardless of the methods specified in this element, the EJB container does not retry transactions that fail because of system exception-based errors.
Identifies an application role name that the EJB provider placed in the ejb-jar. This is how I look up my EJBs:. If using EJB 3. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Collectives on Stack Overflow. Learn more. Asked 7 years, 6 months ago. Active 7 years, 5 months ago. Viewed 8k times. Improve this question. This links has a good but lengthy explanation with examples: examples. Than you very much for your response. I did find the article you linked before, but rejected it because I found it to differ significantly from my case.
However, is the same possible to do using only the EJB annotations and not invoking the lookup? Add a comment.
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