how to call a java method from javascript

Is there a way to call a java method from javascript rather than using JSP <%ClassName.aJavaMethod();%>

example:
<script type="text/JavaScript">
ClassName.aJavaMethod();
<script/>

thank

That is principallly impossible, because Java is executed on the server, while JavaScript runs on the client. What are you trying to do?

You might benefit from reading this article.

There is a product named DWR that uses Ajax to sort of implement an RPC setup between client and server. But you should understand the concepts behind servlets and Ajax before attempting to use it.