Sorry if it is a repeated question (I've searched a lot yet, and did not found anything to solve my problem)

I cannot compile servlets previous to uploading them to the server. I have tested uploading the .java source, and after Resin auto-compilation, everything works fine. But when I compile the servlet in my computer and upload it, it reports:
-----------------------------------------
500 Servlet Exception
javax.servlet.ServletException: Class `com.threeeff.trg.j2ee.MyServlet'
was not found in classpath.
Classes normally belong in /j2ee/WEB-INF/classes.
-----------------------------------------

Let me explain what I've done:
1. downloaded resin-2.1.17.zip and extracted "jsdk23.jar" and included in the classpath for compiling
2. with ant:
2.1 compile the class for java 1.4 target
2.2 build the webapp so:
2.2.1 MyServlet.class copies to j2ee/WEB-INF/classess/com/threeeff/trg/j2ee
2.2.1 jsdk23.jar is not included in j2ee/WEB-INF/lib

Please, can anybody tell me where is the mistake?

thanks, Juan.

Thanks for the details, but that was my mistake when writing the message.

That didn't solve te problem.

Juan.

FINALLY!!

 I've found the solution after painfull retries. The solution was to target the javac compilation to 1.4 version.

  My problem was to lack of better know-how on "ant" (I knew I needed to target compilation to 1.4) I was trying to target 1.4 version using "compiler" attribute in "javac" (ant) target. My solution was to use "source=1.4" and "target=1.4" attributes. So the line on ant must be:

<javac [...other attributes...] source="1.4" target="1.4"/>

Hope this help to others...

Juan.