"Missing SEI" when generating artifacts with WSGEN

I am a beginner in the development of web services. I want to generate artifacts using wsgen.exe.

Here is my code:

  package com.calc.ws;

  import javax.jws.WebService;

  @WebService
  public class Calculator {
      public int add(int a, int b) {
          return (a + b);
      }
      public int sub(int a, int b) {
          return (a - b);
      }
  }

The problem I'm facing is when I want to generate the artifacts from the command line with this command (one liner):

C:\Program Files\Java\jdk1.7.0_05\bin\wsgen 
     -cp "c:\users\mico\workspaceSOA\calcWS\src\com.calc.ws.Calculator" 
     -verbose 
     -d "C:\users\mico\classes\"

I get this error:

Missing SEI.

What is causing this?

Wsgen.exe is called in the following way:

WSGEN [options] <SEI>

It reads a web service endpoint implementation class (SEI) and generates all the required artifacts for web service deployment, and invocation.

In the command line you posted I only see options, you specified no SEI. And from here the message "Missing SEI" (i.e. you didn't provide a mandatory command line argument).

I don't know your exact setup but if I were to have this structure:

c:\temp
├───classpath
│   └───com
│       └───calc
│           └───ws
│               └───Calculator.class
└───generated

If I run (on one line):

wsgen -cp c:\temp\classpath 
      -keep 
      -s c:\temp\generated 
      com.calc.ws.Calculator

I will get my classes, but if I run just:

wsgen -cp c:\temp\classpath 
      -keep 
      -s c:\temp\generated 

I will get:

Missing SEI