JSP tags with java beans !! Design Help needed ..

Hi,
I have three tables State,District,College.
My requirement is to get the fields from three tables one time from the DB and populate them with the JSP(so that the DB connections will not be much).
For that :::
I have designed to have three Beans StateBean,DistrictBean and CollegeBean.
Every row in State table will be a StateBean and will be added to an ArrayList called StateBeanList
similarly I got two other lists DistrictBeanList and CollegeBeanList.
And I am using application.setAttribute() to send all the information to the JSP by using RequestDespatcher..
When I run the servlet on tomcat it is getting OutOfMemory Exception in java Heap..Can I increase the heap size on tomcat ?
Apart from increasing the heap size I want to know good design...
My actual requirement is::: in the forwared JSP I need to populate state text field and after selecting state field I need to get the district fileds populated in other text filed, by the value of district field I need to populate college field... we can see it many websites...
Please suggest me the good design..
Thanks in Advance,
Vidhya...

vidhya517 wrote:
I have three tables State,District,College.
My requirement is to get the fields from three tables one time from the DB and populate them with the JSP(so that the DB connections will not be much).
For that :::
I have designed to have three Beans StateBean,DistrictBean and CollegeBean.
Every row in State table will be a StateBean and will be added to an ArrayList called StateBeanList
similarly I got two other lists DistrictBeanList and CollegeBeanList.I would rather let StateBean have a Set<DistrictBean> property and let DistrictBean have a Set<CollegeBean> property. List instead of Set is also okay.
And I am using application.setAttribute() to send all the information to the JSP by using RequestDespatcher..
When I run the servlet on tomcat it is getting OutOfMemory Exception in java Heap..Can I increase the heap size on tomcat ?
Apart from increasing the heap size I want to know good design...How many states, districts and colleges do you have in total? What is your initial heap size? You can just alter it as startup parameters/arguments.
My actual requirement is::: in the forwared JSP I need to populate state text field and after selecting state field I need to get the district fileds populated in other text filed, by the value of district field I need to populate college field... we can see it many websites...
Please suggest me the good design..

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 ciao bernd
 "sravana" <[email protected]> wrote:
 >
 >Thank you very much Xiang Rao, It worked fine.
 >Thanks again
 >sravana.
 >
 >"Xiang Rao" <[email protected]> wrote:
 >>
 >><%@ page import="userbn" language = "java" contentType = "text/html"
 >>%> should
 >>work for you.
 >>
 >>
 >>"sravana" <[email protected]> wrote:
 >>>
 >>>HI ,
 >>>
 >>>I am using weblogic6.0 sp1.
 >>>
 >>>i have problem with jsp and java beans.
 >>>
 >>>i am using very simple java bean which stores name and email
 >>>
 >>>from a html form.
 >>>
 >>>but i am getting following errors:
 >>>
 >>>________________________________________________________________
 >>>
 >>>Full compiler error(s):
 >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
 >>>cannot resolve symbol
 >>>symbol : class userbn
 >>>location: class jsp_servlet._savename2
 >>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
 >>> ^
 >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
 >>>cannot resolve symbol
 >>>symbol : class userbn
 >>>location: class jsp_servlet._savename2
 >>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
 >>> ^
 >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:94:
 >>>cannot resolve symbol
 >>>symbol : class userbn
 >>>location: class jsp_servlet._savename2
 >>> ud = (userbn) java.beans.Beans.instantiate(getClass().getClassLoader(),
 >>>"userbn"); //[ /SaveName2.jsp; Line: 7]
 >>> ^
 >>>3 errors
 >>>
 >>>____________________________________________________________
 >>>
 >>>in which directory should i place java bean source file(.java file)
 >>>
 >>>here is my jsp file:
 >>>--------------------------------------------------------
 >>>
 >>><%@ page language = "java" contentType = "text/html" %>
 >>><html>
 >>><head>
 >>><title>bean2</title>
 >>></head>
 >>><body>
 >>><jsp:usebean id = "ud" class = "userbn" >
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 >>>{
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 >>> }
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