你的ejb-jar.xml至少的包括:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 1.1//EN" "http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd">
<ejb-jar>
    <enterprise-beans>
        <session>
            <ejb-name>HelloWorld</ejb-name>
            <home>HelloWorldHome</home>
            <remote>HelloWorld</remote>
            <ejb-class>HelloWorldBean</ejb-class>
            <session-type>Stateless</session-type>
            <transaction-type>Container</transaction-type>
        </session>
 <assembly-descriptor>
        <container-transaction>
            <method>
                <ejb-name>HelloWorld</ejb-name>
                <method-name>*</method-name>
            </method> 
            <trans-attribute>Required</trans-attribute>
        </container-transaction>
    </assembly-descriptor>
weblogic-ejb-jar.xml的有:
<weblogic-ejb-jar>
    <weblogic-enterprise-bean>
        <ejb-name>HelloWorld</ejb-name>
        <jndi-name>HelloWorld</jndi-name>
    </weblogic-enterprise-bean>
</weblogic-ejb-jar>