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  1. 06-23-2007, 11:42 PM #1
    Jack
    Jack is offline Senior Member
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    Default Description the server encountered an internal error

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

    my code is:
    javabean.jsp

    Java Code: 
    <html>
<head>
<title>JavaBean example</title>
</head>
<body>
<jsp:useBean id="m" scope="page" class="Message" />
<&#37;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

    Java 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:
    Java 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?
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  2. 07-02-2007, 02:21 AM #2
    Peter
    Peter is offline Senior Member
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    Default

    According to the error you can't use the Message class with this tag.
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  3. 07-02-2007, 02:24 AM #3
    Ed
    Ed is offline Senior Member
    Join Date
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    Default

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

    Java Code: 
            <jsp:useBean id="m" scope="page" class="version01.Message" />
        <&#37; m.setMessage("Hello"); %>
        <%=m.getMessage()%>
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