Hai everybody - i got a problem plese resolve it.

I have a complied a bean that is located in the
webapps/project/WEB-INF/classes directory.
When I execute my jsp page, I get the error:
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request.
exception
org.apache.jasper.JasperException: /studData.jsp(77,1) The value for
the useBean class attribute SQLBean.DbConnection is invalid.
org.apache.jasper.servlet.JspServletWrapper.handle JspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
root cause
org.apache.jasper.JasperException: /studData.jsp(77,1) The value for
the useBean class attribute SQLBean.DbConnection is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jsp Error(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatc h(ErrorDispatcher.java:405)
org.apache.jasper.compiler.ErrorDispatcher.jspErro r(ErrorDispatcher.java:146)
org.apache.jasper.compiler.Generator$GenerateVisit or.visit(Generator.java:1174)
org.apache.jasper.compiler.Node$UseBean.accept(Nod e.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.j ava:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody( Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node .java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.j ava:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.j ava:2163)
org.apache.jasper.compiler.Generator.generate(Gene rator.java:3304)
org.apache.jasper.compiler.Compiler.generateJava(C ompiler.java:19
org.apache.jasper.compiler.Compiler.compile(Compil er.java:295)
org.apache.jasper.compiler.Compiler.compile(Compil er.java:276)
org.apache.jasper.compiler.Compiler.compile(Compil er.java:264)
org.apache.jasper.JspCompilationContext.compile(Js pCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:303)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
note The full stack trace of the root cause is available in the Apache
Tomcat/5.5.15 logs.
I do have a public constructor for the class.
However, I have not touched my web.xml file. Is there any tutorial out
there that will help me understand what I need to do?
Or could anyone let me know what changes I need to make?
Thanks in advance!

hey dingdongbell,
Let me assure you that operating system is not the cause for this error.
See the stack trace ..
The value for the useBean class attribute SQLBean.DbConnection is invalid.
Has SQLBean been compiled properly ? Did u pass any arguments to this class?
what is the perfect operating system for java.Linux, Unix for deployment due to faster performance.
Windows for development environment.
-Rohit

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