在从Servlet调用的Session-Bean中，SessionContext始终为空

Question

protected void preventTransactionRolledBackException() {
    if (this.getSessionContext().getRollbackOnly()) {
        this.getSessionContext().setRollbackOnly();
    }
}

public class NewZekEclsServiceServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String operation = null;
        response.setContentType("text/xml");
        try { 
            PrintWriter out = response.getWriter(); 
            // Get Header data
            // Get Attribute data
            // Get Body data:
            InputStream body = request.getInputStream();
            String xml = IOUtils.toString(body, "UTF-8");

            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            docBuilderFactory.setNamespaceAware(true); // required as several namespaces might be used
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(new InputSource(new StringReader(xml)));

            operation = getOperation(doc); // method which scans the xml to retrieve the correct operation to use.

            if (operation.equalsIgnoreCase("Ping")) {

                // Calling the Adapter Bean:
                EclsTestBeanBean eclsTestBean = new EclsTestBeanBean();
                eclsTestBean.ejbCreate();

                PingIn pingIn = new PingIn();
                PingOut pingOut = eclsTestBean.ping(pingIn);

                String xmlString = convertEclsObjectToSOAPString(pingOut);
                out.print(xmlString);

            }
        }
    }
}

/**
 * Bean implementation class for Session Bean: EclsTestBean
 *
 * @ejb.bean
 *  name="EclsTestBean"
 *  type="Stateless"
 *  jndi-name="ejb/ch/zek/ecls/EclsTestBeanHome"
 *  view-type="remote"
 *  transaction-type="Bean"
 *
 * @ejb.home
 *  remote-class="ch.zek.ecls.EclsTestBeanHome"
 *
 * @ejb.interface
 *  remote-class="ch.zek.ecls.EclsTestBean"
 *
 */
public class EclsTestBeanBean implements javax.ejb.SessionBean {

    private Log log = LogFactory.getLog(EcodeAbfragenAction.class);

    private SessionContext mySessionCtx;

    public SessionContext getSessionContext() {
        return mySessionCtx;
    }

    public void setSessionContext(SessionContext ctx) {
        mySessionCtx = ctx;
    }

    public void ejbCreate() throws CreateException {}
    public void ejbActivate() {}
    public void ejbPassivate() {}
    public void ejbRemove() {}

    /**
     * Basic ping service for ECLS
     * @param parameters
     * @return
     * @throws PingEntityNotFoundException
     * @throws PingPermissionException
     * @throws PingSystemException
     */
    public ch.zek.ecls.PingOut ping(ch.zek.ecls.PingIn parameters) throws java.rmi.RemoteException, ch.zek.ecls.PingPermissionException, ch.zek.ecls.PingEntityNotFoundException, ch.zek.ecls.PingSystemException {

        PingOut pingOut = new PingOut();
        String pingAnswer = "Ping_ECLS_v1";
        String adapter = "";
        String operation = "";

        Parameter[] msgParams = new Parameter[1];
        String eclsEnvironment = "TEST";
        pingAnswer += "_" + eclsEnvironment;

        logAvailableEjbs();

        try {
            if (mySessionCtx != null) { // Why can it be null at all?
                log.debug("mySessionCtx: " + mySessionCtx.getContextData());
            } else {
                log.debug("mySessionCtx was null");
                InitialContext ic = new InitialContext();
                mySessionCtx = (SessionContext) ic.lookup("java:comp/env/sessionContext"); // gives error:  javax.naming.NameNotFoundException: Name "comp/env/sessionContext" not found in context "java:".
                System.out.println("mySessionCtx: " + mySessionCtx);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // creating the SOAP data... not relevant for the problem.
        msgParams[0] = new Parameter();
        msgParams[0].setValue(pingAnswer);
        SystemMessage systemMessage = new SystemMessage();
        systemMessage.setCode("OK");
        systemMessage.setMessage("Ping");
        systemMessage.setParameter(msgParams);
        pingOut.setSystemMessage(systemMessage);

        return pingOut;
    }

    /**
     * ONLY USED DURING DEVELOPMENT:
     * Helper method to print "accessible" EJBs.
     */
    protected void logAvailableEjbs() {
        try {
            //Get the Initial Context for the JNDI lookup for a local EJB
            InitialContext ic = new InitialContext();

            NamingEnumeration<NameClassPair> list;
            String level = "";
            String name = "";
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }
            level = "ejb";
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }   
            level = "java:comp";
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }
            level = "java:comp/env";
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }
            /*
            level = "java:comp/env/ejb"; // Throws Error!
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }
            */
            level = "java:global";
            list = ic.list(level);
            while (list.hasMore()) {
                name = list.next().getName();
                System.out.println(level + "/" + name);
            }
        } catch (NamingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

SystemOut     O /jta
SystemOut     O /eis
SystemOut     O /cell
SystemOut     O /thisNode
SystemOut     O /DefaultDatasource
SystemOut     O /services
SystemOut     O /jdbc
SystemOut     O /servername
SystemOut     O /com.ibm.websphere.ejbcontainer
SystemOut     O /com
SystemOut     O /zek
SystemOut     O /wm
SystemOut     O /ejb
SystemOut     O /Increment
SystemOut     O /tm
SystemOut     O ejb/ivtEJBObject
SystemOut     O ejb/ch
SystemOut     O ejb/mgmt
SystemOut     O java:comp/ValidatorFactory
SystemOut     O java:comp/TransactionSynchronizationRegistry
SystemOut     O java:comp/ORB
SystemOut     O java:comp/Validator
SystemOut     O java:comp/UserTransaction
SystemOut     O java:comp/env
SystemOut     O java:comp/BeanManager
SystemOut     O java:comp/websphere
SystemOut     O java:comp/HandleDelegate
SystemOut     O java:global/com.ibm.ws.AppNameSpaces
SystemOut     O java:global/NewZekEar
SystemOut     O java:global/SchedulerCalendars
SystemOut     O java:global/DefaultApplication
SystemOut     O java:global/cell
SystemOut     O java:global/query
SystemOut     O java:global/ManagementEJB
SystemOut     O java:global/ivtApp

@Resource
private SessionContext mySessionCtx;

transaction-type="Container"

没有任何帮助。我理解应该自动创建SessionContext。但如果不是--你有什么选择去创建一个新的呢？进一步的问题：servlet还“创建”了一个我可以访问的会话(request.getSession())，但这是不同的（HTTPSession）。我想我不能共享或“转换”这个会话对象到会话bean？

Answer 1

EclsTestBeanBean eclsTestBean = new EclsTestBeanBean();