error starting application

[Eduardo Ponce de Leon]

Today I am resuming my programming and when starting my server and going to my app i am getting this error..

org.apache.jasper.JasperException: /login.jsp (línea: 4, columna: 0) El valor el atributo de clsae useBean personal.java.Data es inválido.
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
	org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1234)
	org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1182)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
	org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
	org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
	org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
	org.apache.jasper.compiler.Generator.generate(Generator.java:3490)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:644)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

the error refers to this line...

<jsp:useBean id="add" class="personal.java.Data" scope="session"/>

however i havent made any changes to my code and i have no idea why is this happening, any help??

[Bear Bibeault]

Is the class file for personal.java.Data where it belongs?

[Eduardo Ponce de Leon]

Yes, my 'Data.java' is under my src folder 'personal.java'!!

[Bear Bibeault]

I did not ask about the Java file, which is completely irrelevant, but the compiled class file.

[Eduardo Ponce de Leon]

I am running my app from eclipse. I clean my project and was able to see my login page and now getting thise error..

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.ClassNotFoundException: org.postgresql.Driver
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:548)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:456)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

that driver is in my referenced libraries folder!! I have no idea what is going on?

[Hebert Coelho]

Did you added the postgres jar to your applications?