Seam method not found

I am using the seam framework and when I render .xhtml file (which contains stManagerImpl) it开发者_Python百科 should create an instanse of stManagerImpl. But it gives me an exception:

javax.el.MethodNotFoundException: Method not found:
    com.student.stManagerImpl@1b41711.showForm(java.lang.Long)

Even before calling @begin annotated function.

Where can be attached the showForm((java.lang.Long) method to stManagerImpl

Thanks