package info.ejava.examples.jaxrs.todos.rs;
   
   import javax.ejb.Stateless;
   import javax.ejb.TransactionAttribute;
   import javax.ejb.TransactionAttributeType;
   
   import info.ejava.examples.jaxrs.todos.ejb.InternalErrorException;
   import info.ejava.examples.jaxrs.todos.ejb.InvalidRequestException;
   
  @Stateless
  public class GreetingEJB {
      @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
      public String greet(String name) throws InvalidRequestException {
          try {
              if (name==null || name.isEmpty()) {
                  throw new InvalidRequestException("Unable to greet, name not supplied");
              }
              
              return String.format("hello %s", name);  //core business code
              
          } catch (RuntimeException ex) {
              throw new InternalErrorException("Internal error greeting name[%s]: %s", name, ex);
          }
      }
  }