Description the server encountered an internal error

Jack · #1 (**permalink**) 06-24-2007, 12:42 AM

Hi,
I have a problem with the java beans and I can't resolve it

my code is:
javabean.jsp

Code:


<html>
<head>
<title>JavaBean example</title>
</head>
<body>
<jsp:useBean id="m" scope="page" class="Message" />
<%m.showMessage("hi world");%>
</body>
</html>

I'm using tomcat 6.10.0 and this is the directory tree

webapps
practice
jsp
javabean.jsp
WEB-INF
classes
Message.class

this is the bean

Code:

public class Message
{
 private String Message;

 public Message(String Message)
 {
  this.Message= new String(Message);
 }
 
 public void showMessage()
 {
  System.out.println(Message);
 }
}

and the exception is:

Code:


description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: /jsp/javabean.jsp(6,0) The value for the useBean class attribute Mensaje is invalid.
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
	org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
	org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
	org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
	org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2392)
	org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
	org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

what is the problem????
any ideas?

Peter · #2 (**permalink**) 07-02-2007, 03:21 AM

According to the error you can't use the Message class with this tag.

Ed · #3 (**permalink**) 07-02-2007, 03:24 AM

I think that the problem is in the constructor:
try this

Code:

package version01;

public class Message
{
    private String message;

    public void Message(String message)
    {
        this.message= new String(message);
    }
    
    public String getMessage()
    {
        return message;
    }
}

javabean.jsp

Code:


        <jsp:useBean id="m" scope="page" class="version01.Message" />
        <% m.setMessage("Hello"); %>
        <%=m.getMessage()%>