NoSuchMethodError when using EJB3

[Ravi Kiran Va]

Hi

I am using Servlets and EJB in my application with Hibernate as persistence Technique .
I am setting Data inside Hibernate POJO annotated class an sending it to EJB Layer to do persistence . This is my code .

My EJB Interface :

public interface HelloEjb
{
	public void printHello(Employee emp);
}

// My EJB Class

public class HelloEjbBean implements HelloEjb 
{
	    public void printHello(Employee employee) 
	    {

// After creation of sessionfactory

		  Session session = sessionFactory.openSession();

	      session.save(employee);



            }
}

This is my servlet where i am setting Data and directly sending the POJO class to EJB

HelloEjb  ejbinstance = (HelloEjb)ctx.lookup("HelloEjb#ejb3.HelloEjb");// specific to weblogic container
			
			Employee emp = new Employee();
			emp.setId(new Long(10));
			emp.setName("SaiKiran");
         		ejbinstance .printHello(emp);

I am getting this Exception

Root cause of ServletException.
java.lang.NoSuchMethodError: ejb3.HelloEjb.printHello(Lmypack/Employee;)V
at Test.doGet(Test.java:34)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run
(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecuri
tyHelper.java:125)
Truncated. see log file for complete stacktrace


About the NoSuchMethodError is
Normally, this error is caught by the compiler; this error can only occur at run time if the definition of a class has incompatibly changed.


Can anyboody please tell me why this error is coming and how can i execute successfully .

[Tom Kowalski]

If I were you I would try to reduce the area in which there is cause of this error. Have you tried to comment (//) the code inside the method of the bean? Try to do this, is the error still thrown.

public class HelloEjbBean implements HelloEjb   
{  
        public void printHello(Employee employee)   
        {  
          //Session session = sessionFactory.openSession();  
          //session.save(employee);  
         }  
}  

[Waclaw Borowiec]

Double check if you don't have an outdated (i.e. without all required methods) HelloEjb.class or HelloEjbBean.class files on your classpath. Clean, refresh your resources, make sure to delete all jars/ears you're building and deploying.

[Ravi Kiran Va]

Thank you .i will try and let you know .