Recompilation of java class invalidates taglib jsp page?

Hi everyone,
          I have a JSP page which calls a custom tag library. On freshly compiling
          everything and
          calling the JSP page from a browser for the first time the output is as
          expected.
          However when ever I recompile one of the classes that get called anywhere in
          the tag
          library call the tag no longer works (internal error from the server).
          To get it to work I have to change the jsp page so that it recompiles.
          Weblogic server 5.1 (no service patches yet) running on NT server SP6a.
          Any ideas?
          MTIA
          Craig

p.s
          The following errors are in the log file.
          Is this another class casting problem?
          Does any one have any explanations?
          Ta
          Craig
          <ServletContext-General> Servlet failed with Exception
          javax.servlet.ServletException: runtime failure in custom tag 'MyTag'
          at jsp_servlet._taglib._jspService(_taglib.java:89)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          , Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java, Compiled Code)
          at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java,
          Compiled Code)
          at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java,
          Compiled Code)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled Code)
          <ServletContext-General> root cause of ServletException
          java.lang.ClassCastException: com.bt.db.MyTag
          at jsp_servlet._taglib._jspService(_taglib.java:77)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          , Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java, Compiled Code)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java, Compiled Code)
          at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java,
          Compiled Code)
          at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java,
          Compiled Code)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled Code)
          "crg" <[email protected]> wrote in message
          news:[email protected]...
          > Hi everyone,
          >
          > I have a JSP page which calls a custom tag library. On freshly compiling
          > everything and
          > calling the JSP page from a browser for the first time the output is as
          > expected.
          > However when ever I recompile one of the classes that get called anywhere
          in
          > the tag
          > library call the tag no longer works (internal error from the server).
          > To get it to work I have to change the jsp page so that it recompiles.
          >
          > Weblogic server 5.1 (no service patches yet) running on NT server SP6a.
          >
          > Any ideas?
          > MTIA
          >
          > Craig
          >
          >
          >
          >

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    deployButton=request.getParameter("deploy");
    String undeployButton = "";
    undeployButton=request.getParameter("undeploy");
    if(!deployButton.equalsIgnoreCase("")){
        rt.buttonClicked(request.getParameter("deployButton"));
    if(!undeployButton.equalsIgnoreCase("")){
        rt.buttonClicked(request.getParameter("undeployButton"));
   rt.boxName(request.getParameter("boxName"));
    rt.goTest();
%>
</form>
</table>
</BODY>
</HTML>

How to access variables declared in java class file from jsp

i have a java package which reads values from property file. i have imported the package.classname in jsp file and also i have created an object for the class file like
classname object=new classname();
now iam able to access only the methods defined in the class but not the variables. i have defined connection properties in class file.
in jsp i need to use
statement=con.createstatement(); but it shows variable not declared.
con is declared in java class file.
how to access the variables?
thanks

here is the code
* testbean.java
* Created on October 31, 2006, 12:14 PM
package property;
import java.beans.*;
import java.io.Serializable;
public class testbean extends Object implements Serializable {
public String sampleProperty="test2";
public String getSampleProperty() {
return sampleProperty;
}jsp file
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ page import="java.sql.*,java.util.*"%>
<html>
<head>
<title>Schedule Details</title>
</head>
<jsp:useBean id="ConProp" class="property.testbean"/>
<body>
Messge is : <jsp:getProperty name="msg" property="sampleProperty"/>
<%
out.println(ConProp.sampleProperty);
%>
</body>
</html>out.println(ConProp.sampleProperty) prints null value.
is this the right procedure to access bean variables
thanks

Recompilation of java class invalidates taglib jsp page?

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