invalid standard action error on Tomcat

Question

I have started to learn JSP and I tried to write my first JSP page and use <jsp:usebean/> action tag. The bean is an empty class that has no property and only one method print():

package foo;
import java.io.Serializable;

public class FirstBean implements Serializable {
    public String print() {
        return "hello, world";
    }
}

I compiled the FirstBean.java file into foo directory which resides in the WEB-INF/classes directory. Then I have the FistBean.jsp file with the following content:

   <html>
        <head>
             <jsp:usebean id="name" class="foo.firstBean"/>
        </head>
         <body>
            <! String st=name.Print();%>
            <p> the string stored in JSP is <%=st%></p>
        </body>
   </html>

In the above code I instantiate the firstBean instance via usebean action. Then I call its print() method which shoud return a String "Hello, world". But when I try to type localhost:8080/jsp/firstBean.jsp file Tomcat gives me the following error:

message /firstBean.jsp(3,7) Invalid standard action

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

I get the following exception:

org.apache.jasper.JasperException: /firstBean.jsp(3,7) Invalid standard action 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:88) org.apache.jasper.compiler.Parser.parseStandardAction(Parser.java:1131) org.apache.jasper.compiler.Parser.parseElements(Parser.java:1424) org.apache.jasper.compiler.Parser.parse(Parser.java:130) org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255) org.apache.jasper.compiler.ParserController.parse(ParserController.java:103) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185) org.apache.jasper.compiler.Compiler.compile(Compiler.java:354) org.apache.jasper.compiler.Compiler.compile(Compiler.java:334) org.apache.jasper.compiler.Compiler.compile(Compiler.java:321) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

It will be much appreciated if someone could help me with this issue.

user7294900 user7294900 · Accepted Answer · 2018-01-28T16:07:48

0

votes

The right syntax for JSP code is with percent sign

      <% String st=name.Print();%>

invalid standard action error on Tomcat

1 Answers