Netbeans简单的java web服务

Question

我有一个简单的Web服务，有两个操作，一个调用数据库中的存储过程来插入数据，另一个只返回输入的文本（用于测试）。我已经部署了返回输入文本的Web服务和操作，但是当我尝试测试“调用过程”操作时，我收到消息：

Cannot call methods requiring a transaction if the entity manager has not been joined to the current transaction."

有服务代码：

package service;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.persistence.Query;
import javax.transaction.UserTransaction;

@WebService(serviceName = "HelloSPJPA")
public class HelloSPJPA {
    @PersistenceUnit
    EntityManagerFactory emf;
    @Resource
    UserTransaction utx;
    /**
     * This is a sample web service operation
     */
    @WebMethod(operationName = "hello")
    public String hello(@WebParam(name = "name") String txt) {
        return "Hello " + txt + " !";
    }
    @WebMethod(operationName = "callprocedure")
    public String callProcedure(@WebParam(name = "name") String txt) {
        String result = "OK";
        Query query = emf.createEntityManager().createNativeQuery("begin p_test_insert(message_in => ?); end;").setParameter(1, txt);
        try {
            utx.begin();
            query1.executeUpdate();
            utx.commit();
        } catch (Exception ex) {
            Logger.getLogger(HelloSPJPA.class.getName()).log(Level.SEVERE, null, ex);
            result = ex.getMessage();
        }      
        return result;
    }
}

我不知道如何在交易中加入该实体经理？有什么建议吗？

谢谢！