[jboss-user] [EJB 3.0] - transaction problem

[Sukar1205]

I am trying to run a client class to test the CustomerBean class that I wrote but its giving me an error which mentions EntityManager must be access within a transaction. I am new to EJB3 so bear with me please.
This the code for my customerBean class.


  | @Stateless
  | public class CustomerBean implements CustomerRemote {
  |     
  |     @Resource(mappedName = "java:/SQL")
  |     private DataSource SQL;
  | 
  |     @PersistenceContext private EntityManager em;
  |      
  |     public void addCustomer(TempCustomer a){
  |         em.persist(a);   //This is where the Exception occurs ..thanks
  |     }
  |     
  |     public TempCustomer findCustomerbyID(int id) {
  |         return em.find(TempCustomer.class, id);
  |     }
  |     
  |     public void deleteCustomer(TempCustomer a) {
  |          em.remove(a);
  |     }
  |     
  |     public void deleteID(int id){
  |         em.remove(id);
  |     }
  | 
  | 

And this is my client class to test my CustomerBean class... I am just trying to add 2 customers in the table.


  | public class Client {
  |     public static void main(String[] args) throws Exception
  |     {
  |         Connection conn;
  |         // Step 1: Load the JDBC driver.
  |         Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
  |         System.out.println("Driver Loaded.");
  |         // Step 2: Establish the connection to the database.
  |         String url = "jdbc:sqlserver://localhost:1433;database=jdocxpt";
  |         conn = DriverManager.getConnection(url, "sa", "");
  |         System.out.println("Got Connection.");
  |         
  |         Context ctx = getInitialContext();
  |         CustomerRemote c = (CustomerRemote) ctx.lookup("CustomerBean/remote");
  |         
  |         TempCustomer first = new TempCustomer();
  |         TempCustomer second = new TempCustomer();
  |         
  |         System.out.println("adding Customers");
  |         first.setId(20);
  |         first.setName("aaaa");
  |         second.setId(21);
  |         second.setName("kkkk");
  |         c.addCustomer(first);
  |         c.addCustomer(second);
  | }

I would appreciate it if some could help me with this transaction problem.
THANKS IN ADVANCE.

the error is 

  | Exception in thread "main" javax.ejb.EJBTransactionRolledbackException: EntityManager must be access within a transaction
  |         at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:87)
  |         at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
  |         at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
  |         at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:106)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  |         at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:278)
  |         at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
  |         at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
  |         at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:734)
  |         at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:560)
  |         at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:369)
  |         at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:165)
  | 

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