Caros amigos! Estou seguindo o livro do Budi e cheguei na parte Jsp com javaBeans. Segui os passo do livro e quando executei a pagina no NetBeans ele deu o um erro. Nem os exemplos de jsp do netbeans funcionaram.
Abaixo a codificação e o erro gerado
codigo da Class calc:
package myJSPApp;
public class calc {
public int doubleIt(int number){
return 2 * number;
}
}
Codigo do jsp:
<jsp:useBean id=“teste” class=“myJSPApp.calc”/>
<html>
<head><title>Calculador</title></head>
<body>
<%
int i = 4;
System.out.println(“ok”);
int j = teste.doubleIt(i);
out.println("2 * 4 = " + j);
%>
<%-- <jsp:useBean id=“beanInstanceName” scope=“session” class=“beanPackage.BeanClassName” /> --%>
<%-- <jsp:getProperty name=“beanInstanceName” property=“propertyName” /> --%>
</body>
</html>
lista do erro que o tomcat gerou:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /myJSPApp/calculador.jsp(1,1) The value for the useBean class attribute myJSPApp.calc is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1225)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3269)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:305)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.
Apache Tomcat/5.0.27