May 2018
« Sep    
Your widget title

Posts Tagged ‘EJB’

PostHeaderIcon WebLogic 10.x new features

Recent history

BEA WebLogic 9.0, 9.1 and 9.2 were released from 2007: the main features were: a new console, WLST (WebLogic ScriptingTool), deployment plans, WebLogic Diagnostic Framework (WLDF), new security providers (RDBMS, SAML 1.1, etc.), JMS performance improvements, support of Java EE 4, JDK 5, Spring, OpenJPA, Kodo, etc.

Since this date, some events happened:

  • Oracle bought Sun (2009)
  • Oracle released WebLogic 10.3 (2008)
  • Oracle bought BEA (2008)

WebLogic Server 10 General Features

  • Developer productivity ehancements
    • JDK 6, Java EE 5
    • Support of EJB3 and JPA
    • BEA enhancements
  • Web Services: more annotations, less XML
    • JAX-RPC Web Services Enhancements
    • JAX-WS 2.0 Web Services Implementation
  • Misc:
    • Better administration console
    • Auto-Record of Admin Console actions as WLST scripts
    • Automatic JTA Transaction Recovery Service (TRS) migration
    • SNMP 3.0
    • Production Application Redeployment enhancements
    • Clustering – Unicast messaging (in addition to Multicast)

Programmer Perspective

  • New persistence engine: TopLink
  • OEPE (Oracle Entreprise Pack for Eclipse): sequence of tools and plugins for Eclipse: remote deployment, debugging,  editors for weblogic.xml and weblogic-application.xml, wizards, facets, Weblogic ClientGen, WSDLC and JAXB wizards
  • Optimizations for Spring integration and certication
  • Web 2.0:
    • Ajax / Dojo client support
    • Http publish / submit engine for collaborative applications:
      • Bayeux protocol
      • data exchange within applications over persistent connections
      • scalability for Dojo clients
  • Ad-hoc tools for:
    • Oracle Database
    • Spring
    • JAX-WS webservices

Lightweight WebLogic Server

WebLogic 10 offers a light weight server:

  • Install only “core” WebLogic server
  • Optionally, startup other services (JDBC, EJB, JMS, etc.)
  • FastSwap: modify classes without requiring redeployment.

Architect Perspective

Architects have to consider WebLogic as a complete suite, and not only WebLogic Server:

  • Oracle RAC integration: Connectivity to RAC with load balancing, failover, transactions
  • Enterprise Messaging with JMS: High performance and reliable JMS messaging engine “built-in”
  • ActiveCache with Coherence*Web and EJB/JPA: Coherence Data Grid caching included and integrated
  • Operations Automation: Tools for automating management of applications and servers
  • Operations Insight: Tools for diagnosing problems in development and production
  • Other features
    • Development tools: Choice of tools for developer productivity
    • Web Services: Enterprise Web Services for SOA
    • TopLink: Persist application data to stores with performance and productivity. It works in a way similar to Hibernate L2 cache.
    • Spring: Enable flexible choice of dev frameworks with same WebLogic QOS

Production and Support Perspective

WebLogic 10 provides a tool: JRockit Mission Control

  • monitors more than 150 parameters:
  • CPU
    • memory
    • leaks
    • latency spikes
    • threads
    • object references
    • JDBC connections
    • JMS
    • pools
    • clusters
    • configuration files
    • etc.
  • allows to compare WebLogic domains
  • Runtime Analyzer: runtime capture for offline analysis, Garbage Collector analysis, etc.

Coherence – ActiveCache

Coherence is the Data Grid offered by Oracle. It allows to store Java objects in memory, and share them between all instances. From a certain viewpoint, Coherence looks like the GigaSpaces.

Roadmap for Future WebLogic Releases

  • Support of Java EE 6 (ratified by the community in last December)
  • OSGi deployment
  • More native integration for WebLogic Server – Coherence – Oracle Database
  • JRockit Flight Recorder for constant record
  • Virtualization
  • More integration with Maven, Hudson and Cruise Control
  • Shared Library: use the same JAR for many applications, rather than packing the same JAR in different EARs.
  • On long term:
    • IDE
      • NetBeans to be oriented onto J2ME development
      • JDevelopper to remain Oracle strategic IDE
      • Contributions to Eclipse to go on
    • JRockit and Sun HotSpot JVMs to be merged.

PostHeaderIcon [EJB:011055]Error deploying the EJB


On redeploying the application myFooApplication, this error appears:

[EJB:011055]Error deploying the EJB 'myFooSession(Application: foo-ejbfoo-ear, EJBComponent: foo-foo-services-ejb-0-DEV.jar)', the JNDI name '' is already in use. You must set a different JNDI name in the weblogic-ejb-jar.xml deployment descriptor for this EJB before it can be deployed.


  • Stop the server
  • Delete all files and folders in ${WL_HOME}\servers\myFooApplication.
  • Restart the server

You may encounter an error [Deployer:149163]. In this case, I suggest you to consult the related article: The domain edit lock is owned by another session in exclusive mode – hence this deployment operation cannot proceed

PostHeaderIcon Short Tutorial: Migration from EJB Entity to Hibernate


  • let’s consider an EJB Bean AnimalBean, linked to a table JL_Animal
  • let’s have a human understandable name for the Pojo, let’s say: Animal
  • let an EJB entity have following finders:
* @ejb.finder
*   signature = "Collection findByBirthDate(java.lang.Integer birthDate)"
*   query = "SELECT OBJECT(o) FROM AnimalBean AS o WHERE o.birthDate = ?1"
* @ejb.finder
*   signature = "Collection findByCountryAndBirthDate(java.lang.String from,java.lang.Integer birthDate)"
*   query = "SELECT OBJECT(o) FROM AnimalBean AS o WHERE = ?1 AND o.birthDate = ?2"

Read the rest of this entry »

PostHeaderIcon ids for this class must be manually assigned before calling save()


javax.ejb.EJBException: EJB Exception: : ids for this class must be manually assigned before calling save():

Fix: You must assign the primary-key (which is probably a composite-id) before saving the object.