1 Reply Latest reply on Nov 21, 2011 3:21 PM by danielrowe

I need help persisting an Object in a Seam Web Service

sola.sola.akanmu.gmail.com Nov 21, 2011 2:14 AM

Hi All,

Please I am trying to create a Web Service within the Seam Framework. I have been able to consume it using a sample web client. Now I am trying to persist an object within a WebMethod and I keep getting the error : cannot get Transaction for a JTA Transaction and when I try it without using a transaction, It doesn't work or throw any error at all. I have also tried using UserTransaction but then I get:

08:02:32,339 ERROR [STDERR]     at org.jboss.seam.ScopeType.getContext(ScopeType.java:121)
08:02:32,340 ERROR [STDERR]     at org.jboss.seam.Component.getInstance(Component.java:1999)
08:02:32,341 ERROR [STDERR]     at org.jboss.seam.Component.getInstance(Component.java:1994)
08:02:32,342 ERROR [STDERR]     at org.jboss.seam.Component.getInstance(Component.java:1967)
08:02:32,344 ERROR [STDERR]     at org.jboss.seam.Component.getInstance(Component.java:1962)
08:02:32,345 ERROR [STDERR]     at org.jboss.seam.transaction.Transaction.instance(Transaction.java:39)
08:02:32,346 ERROR [STDERR]     at com.dtec.T2MDashboard.ws.SmsInterface.sendSms(SmsInterface.java:64)
08:02:32,348 ERROR [STDERR]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) .....

See my Codes below:

package com.dtec.T2MDashboard.ws;

import java.util.Date;

import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;

import javax.ejb.Stateful;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;

import org.jboss.seam.annotations.Begin;
import org.jboss.seam.annotations.FlushModeType;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.Transactional;
import org.jboss.seam.ScopeType;
import org.jboss.seam.transaction.Transaction;

import com.dtec.T2MDashboard.SmsMessages;

@WebService
@SOAPBinding(style = SOAPBinding.Style.RPC)
public class SmsInterface {

        @WebMethod
        @Begin(flushMode = FlushModeType.MANUAL)
        @Transactional
        public String sendSms(String message, String destination, String sendtime) {
                String result = "-1";

                if (message == null || destination == null || message.trim().equals("")
                                || destination.trim().equals("")) {
                        result = "1";
                        return result;
                }
                SmsMessages smsMessage = new SmsMessages();
                smsMessage.setMessage(message);
                smsMessage.setDestination(destination);
                smsMessage.setDate(new Date());
                if (sendtime.trim().equals("")) {
                        smsMessage.setScheduledDatetime(new Date());
                }

                EntityManagerFactory emf = null;
                try {
                        emf = (EntityManagerFactory) new InitialContext()
                                        .lookup("java:/T2MDashboardEntityManagerFactory");
                        EntityManager em = emf.createEntityManager();
                        // em.getTransaction().begin(); // UserTransaction txn
                        // =Transaction.instance(); //
                        // txn.begin()
                        UserTransaction ut = Transaction.instance();
                        ut.begin();
                        em.persist(smsMessage); // em.flush();
                        // em.getTransaction().commit();
                        // txn.commit();
                        ut.commit();
                        em.flush();

                        result = "0";
                } catch (Exception e) { // TODO Auto-generated catch block
                        e.printStackTrace();
                        result = "-1";
                }

                return result;
        }

        @WebMethod
        public String registerCustomer() {
                return "register customer";
        }

        @WebMethod
        public String transactionAlert() {
                return "transaction alert";
        }
}

I would really appreciate your help in resolving this issue.

Thanks

1. Re: I need help persisting an Object in a Seam Web Service

danielrowe Nov 21, 2011 3:21 PM (in response to sola.sola.akanmu.gmail.com)

I have used Lifecycle.beginCall() and Lifecycle.endCall() to solve this (at least I'm pretty sure that is what gets things working for me -- it's be a while since I wrote that code...)

I don't need to call explicit transaction code (except maybe for rollback on error, but maybe someone else can say that is not necessary?), then, so no need for ut.commit, etc...

It looks like roughly like this:

@Stateless
@WebService(name = "RCMDS", targetNamespace = "com.rcmds.webservices.rcmds")
public class RCMDSAPI {
   @PersistenceContext(unitName = "mdrc") private EntityManager entityManager;
   @Resource SessionContext ctx; // Session-context (used for explicit transaction rollback)

   @WebMethod(operationName = "someMethod")
   public String someMethod() {
      try {
         Lifecycle.beginCall();

         // Persist something
         SomeObject someObject = ...
         entityManager.persist(someObject);

         // Return the result
         return "persisted";
      }
      catch (Exception e) {
         blah, blah...
         return null;
      }
      finally {
         // If we didn't succeed, roll-back the transaction
         if (!success) {
            ctx.setRollbackOnly();

         Lifecycle.endCall();
      }
   }

Hope this helps!
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