Calling java class from jsp page

Dear Friends.
I wrote jsp page and java class.
Am calling java class from jsp page. after processing result,
I have to refresh jsp page from java class.
processing time may take 5 minutes or 1 minute etc. that depends on user.
Can It be possible ? if possible , How ?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

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Is it possible to load java class fom jsp page?
thanks and have a good day!

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Calling my Java class from JSP page

Hello, I am trying to call my Java class from my JSP page passing parameters to it and getting back a collection of result sets. Can someone tell me what I might be doing wrong:
JSP code to call Java class:
<%
String strEssUser = "test";
String strProcessingMonth = "JUL";
String strProcessingYear = "2002";
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
%>
I get this error when I try to run this JSP page using tomcat:
C:\Program Files\Apache Tomcat 4.0\work\Standalone\localhost\em\jsp\Test_0005fSummarySBU_0005fscreen$jsp.java:77: Class org.apache.jsp.ListReturn not found.
strQueryList=new ListReturn(strEssUser.toString(), strProcessingMonth.toString(), strProcessingYear.toString());
I'm not sure if this problem is the way I am calling the Java class, or if I have a problem in the Java code itself. Can anyone help?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

Using java class from JSP page

I have a class that connects to the database and return the result in form of array of objects, now I wrote a tester and I was able to print the result on the console but when it came to JSP how can I use this class I am a bit confused, how can I declare an array of objects and save the result that comes from the class method
note: my class is not a bean it is a service class that contain methods to retreive different information from the database.
I would apritiate any help but please make it in sequence for example declaring an array to hold the result then call the method that returns the array of objects..etc
please help, I am really confused and don't know what to write
thank you

You can access a class in the same way as a bean, after all a bean is just a class that follows a set of rules.
You need to put your classes in packages to access them.
I have 2 packages, params and DTO. I set the class that returns the Data Transfer Object, or array of objects up as I would a bean
<jsp:useBean id="DTO" scope="request" class="params.DTO" />
I think you skip the above declaration and access it directly in code using
params.DTO();
but setting it up as I would a bean allows me to simply use
DTO();
DTO is the class that passes back the array of objects.
Objects themselves I have in a seperate package, also called DTO (sorry if this is confusing, made sense at the time :-) ) You dont need them in seperate packages, just helped me keep DTO objects seperate from business logic classes......
Now before I use params.DTO() I declare a variable of the Object type DTO() returns
<%! DTO.workSheet[] ws; %>
So, ws is the object type that will be returned by params.DTO()
Then to get my array of objects back from params.DTO() :-
ws = DTO.workSheet(day);
or if you dont like the bean declaration
ws = params.DTO.workSheet(day);
You need to put your packages under WEB-INF/Classes when using Tomcat
So I have
Tomcat 5.0\webapps\myApplication\WEB-INF\classes\params
Tomcat 5.0\webapps\myApplication\WEB-INF\classes\DTO
Under which reside the classes

Getting error when calling Java program from JSP page.

Hi All,
I'm getting below error msg, previously the page use to display and also java program use to run properly, but suddenly today i came across this error. May be some settings have been changed on my server, since number of developers uses this common webserver here.
Any help would be much appreciated. Pls let me know if if anyone requires much info regarding this one.
javax.servlet.ServletException: sun/tools/javac/Main
     at java.lang.Throwable.fillInStackTrace(Native Method)
     at java.lang.Throwable.fillInStackTrace(Compiled Code)
     at java.lang.Throwable.(Compiled Code)
     at java.lang.Exception.(Compiled Code)
     at javax.servlet.ServletException.(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.service(Compiled Code)
     at javax.servlet.http.HttpServlet.service(Compiled Code)
     at org.apache.tomcat.core.ServletWrapper.doService(Compiled Code)
     at org.apache.tomcat.core.Handler.service(Compiled Code)
     at org.apache.tomcat.core.ServletWrapper.service(Compiled Code)
     at org.apache.tomcat.facade.RequestDispatcherImpl.doForward
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     at org.apache.jasper.compiler.SunJavaCompiler.compile(Compiled Code)
     at org.apache.jasper.compiler.Compiler.compile(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.doLoadJSP(Compiled Code)
     at org.apache.jasper.servlet.JasperLoader12.loadJSP(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.loadJSP(Compiled Code)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(Compiled Code)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.service(Compiled Code)
Message was edited by:
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Calling java class from jsp page

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