Geronimo 3:EJB查找导致NamingException

时间:2016-02-16 22:10:05

标签: java ejb jndi openejb geronimo

我刚刚在Eclipse中使用Web模块和EJB3模块创建了一个简单的企业应用程序项目。

这是我的 EJB

@Stateless
public class MyBean implements MyBeanRemote {
    public String getGreeting(){return "Hello World!";}
}

这是我的远程业务接口

@Remote
public interface MyBeanRemote {
    String getGreeting();
}

这是我的 Servlet

@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        MyBeanRemote myBean = null;

        try {
            myBean=(MyBeanRemote) new InitialContext().lookup("XXX");                //1
        } catch (NamingException e) {e.printStackTrace();}

        response.getWriter().append(myBean.getGreeting());
    }
}

Bean注入就像一个魅力,但我无法成功执行JDNI查找:应该在行//1而不是XXX插入什么?我尝试过任何可能的组合(好吧,显然错过了正确的组合......)

据我所知,Geronimo使用OpenEJB将名称映射到资源,而at this page则可以读取

  

默认的JNDI名称采用以下格式:{deploymentId}{interfaceType.annotationName}

所以我认为这只是MyBeanRemote,但那不起作用......我错过了什么?我花了最后几个小时尝试不成功,并在SO上阅读类似的答案。

这是我的 openejb.jar.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<ejb:openejb-jar xmlns:app="http://geronimo.apache.org/xml/ns/j2ee/application-2.0" xmlns:bp="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:client="http://geronimo.apache.org/xml/ns/j2ee/application-client-2.0" xmlns:conn="http://geronimo.apache.org/xml/ns/j2ee/connector-1.2" xmlns:dep="http://geronimo.apache.org/xml/ns/deployment-1.2" xmlns:ejb="http://openejb.apache.org/xml/ns/openejb-jar-2.2" xmlns:jaspi="http://geronimo.apache.org/xml/ns/geronimo-jaspi" xmlns:log="http://geronimo.apache.org/xml/ns/loginconfig-2.0" xmlns:name="http://geronimo.apache.org/xml/ns/naming-1.2" xmlns:pers="http://java.sun.com/xml/ns/persistence" xmlns:pkgen="http://openejb.apache.org/xml/ns/pkgen-2.1" xmlns:sec="http://geronimo.apache.org/xml/ns/security-2.0" xmlns:web="http://geronimo.apache.org/xml/ns/j2ee/web-2.0.1">
    <dep:environment>
        <dep:moduleId>
            <dep:groupId>default</dep:groupId>
            <dep:artifactId>MyProjectEJB</dep:artifactId>
            <dep:version>1.0</dep:version>
            <dep:type>car</dep:type>
        </dep:moduleId>
    </dep:environment>
</ejb:openejb-jar>

由向导创建。

1 个答案:

答案 0 :(得分:0)

作为用户 achabahe suggested,在这些question/answers的帮助下,我打印了整个JNDI树:

String getJNDITree() {
    Context context=null;
    try {
        context = new InitialContext();
    } catch (NamingException e1) {e1.printStackTrace();}

    List<String>roots=Arrays.asList("java:comp","java:module","java:app","java:global");

    StringBuilder tree=new StringBuilder();
    for(String root:roots)
        recursiveDeepVisit(context,root,"",tree);   

    return tree.toString()+"\n";
}

void recursiveDeepVisit(Context context,String path,String prefix,StringBuilder tree){
    tree.append("\n"+prefix+path);
    try {
        NamingEnumeration<NameClassPair> list = context.list(path);
        while (list.hasMore()) {
            String innerPath = path+"/"+list.next().getName();
            recursiveDeepVisit(context, innerPath, "    "+prefix,tree);
        }
    } catch (Exception e) {}
}

获得此输出

java:
    java:app
        java:app/env
        java:app/MyProjectEJB
            java:app/MyProjectEJB/MyBean!com.dev.bean.MyBeanRemote
            java:app/MyProjectEJB/MyBean
        java:app/AppName
    java:comp
        java:comp/UserTransaction
        java:comp/HandleDelegate
        java:comp/ValidatorFactory
        java:comp/TransactionManager
        java:comp/Bundle
        java:comp/TransactionSynchronizationRegistry
        java:comp/env
        java:comp/ORB
        java:comp/Validator
        java:comp/BundleContext
    java:TransactionManager
    java:TransactionSynchronizationRegistry
    java:module
        java:module/ModuleName
        java:module/env
    java:global
        java:global/MyProject
            java:global/MyProject/MyProjectEJB
                java:global/MyProject/MyProjectEJB/MyBean!com.dev.bean.MyBeanRemote
                java:global/MyProject/MyProjectEJB/MyBean
        java:global/geronimo-mejb-3.0.1
            java:global/geronimo-mejb-3.0.1/MEJB
            java:global/geronimo-mejb-3.0.1/ejb
                java:global/geronimo-mejb-3.0.1/ejb/mgmt
                    java:global/geronimo-mejb-3.0.1/ejb/mgmt/MEJB
                    java:global/geronimo-mejb-3.0.1/ejb/mgmt/MEJB!javax.management.j2ee.ManagementHome
            java:global/geronimo-mejb-3.0.1/MEJB!javax.management.j2ee.ManagementHome
        java:global/env

事实证明

MyBeanRemote myBean=(MyBeanRemote) new InitialContext().lookup("java:app/MyProjectEJB/MyBean!com.dev.bean.MyBeanRemote"); 

是我正在寻找的解决方案。