Call Java from JSP?

Question

I have a button on a JSP.
This jsp is using normal html tags - not htmlb tags.
Normally, I think, the onClick action of a button calls JavaScript.
Is it possible to call a Java method that is on the same jsp page instead of calling a javascript function?
If I use HTMLB tags, my code would look like:
<hbj:button
                              id="<%=SAPMLogonLogic.uidPasswordLogonAction%>"
                              text="<%=logonLocale.get("LOGON")%>"
                              jsObjectNeeded="TRUE"         
                              width="125px"
                              tooltip="Click here to log on"
                              onClick="getUserAgreement"
                              onClientClick="submitForm"         
                              disabled="false"
                              design="EMPHASIZED"
                         />
But, I just want to use html tags. So, my code would look like this, I suppose:
<input style="height:3ex;" class="urBtnStd" type="button" name="<%=SAPMLogonLogic.uidPasswordLogonAction%>" value="<%=logonLocale.get("LOGON")%>" onClick="getUserAgreement()">
Message was edited by: Eric Heilers

Answer 1

No, you can't do this.
This is because java is a server side script which cannot be directly called from client side script (javascript).
You need to post a html form and do some processing there.
You could for example have a hidden field in the form which you set dynamically with javascript to the method you wish to call, then when you get the form posted to the java code again you can use java reflection api to call the method. (this is in essence what HTMLB does when using the onClick method)