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Editorial Team
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Asked: 2026-05-16T18:55:29+00:00

is it possible to create something like static object using EJB3 in Jboss. in

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is it possible to create something like static object using EJB3 in Jboss. in other words i need to create something like a static object using singleton pattern or something like that, that is because i need to preload a configuration from database and i want that every bean that jboss creates uses this class to read this configuration instead of that every bean load it from the database.

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  1. Editorial Team

    EJB 3.1 does have a standard @Singleton annotation but EJB 3.0 doesn’t. However, JBoss offers a JBoss extension to the EJB 3.0 spec to create a singleton with the @Service annotation.

    From the JBoss EJB 3.0 Reference Documentation:

    Chapter 6. JBoss EJB 3.0 extensions

    JBoss provides a few extensions to the
    EJB 3.0 spec. This chapter describes
    those features here.

    6.1. @Service EJBs

    An extension offered by JBoss EJB 3.0
    is the notion of a
    @org.jboss.annotation.ejb.Service
    annotated bean. They are singleton
    beans and are not pooled, so only one
    instance of the bean exists in the
    server. They can have both @Remote and
    @Local interfaces so they can be
    accessed by java clients. When
    different clients look up the
    interfaces for @Service beans, all
    clients will work on the same instance
    of the bean on the server. When
    installing the bean it gets given a
    JMX ObjectName in the MBean server it
    runs on. The default is

    jboss.j2ee:service=EJB3,name=<Fully qualified name of @Service bean>,type=service

    You can override this default
    ObjectName by specifying the
    objectName attribute of the
    @Service annotation.

    References

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