HTTP Status 500 - Unable to compile class for JSP Java8, Tomcat8.5

Asked 9/9, 2016 at 16:8 Answered 10/9, 2016 at 12:24

I have a main jsp file which makes use of java class in the boxers package. But when I try to run jsp, the following error occures: HTTP Status 500 - Unable to compile class for JSP:in the jsp file: /web/date_info.jsp boxers.B cannot be resolved to a type.

date_info.jsp

 <%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <p><%= boxers.B.voice()%></p>

    </body>
</html>

B class:

 package boxers;


public class B {
    public static String voice()
    {
        return "HELLO";
    }
}

I've read the conflict between versions can cause this; my Java version is 8, Tomcat 8.5..

I've looked into webapps/my_app/build/web/WEB-INF/classes/boxers folder and there is a B.class file...

EDIT: I wonder if those who downvote at least know the answer to the question.

Samaniego answered 9/9, 2016 at 16:8 Comment(17)

try importing the package boxers in your jsp page like <%@ page import="boxers" %> then you can access the class without specifying the package – Arquebus 9/9, 2016 at 18:38

boxers.B cannot be resolved to a type is like searchnig for a class named boxers and within it a property called B – Arquebus 9/9, 2016 at 18:41

@El Sam I can't import only boxers - netbeans requires '.'. Importing <%@ page import="boxers.*" %> and using B.voice() doesn't change things..B cannot be resolved – Samaniego 9/9, 2016 at 20:6

Ok, import the class B <%@ page import="boxers.B" %> and then you can call voice() directly – Arquebus 9/9, 2016 at 20:30

@El Sam Netbeans highlights it - can't find the method without B or boxers.B before it.. – Samaniego 9/9, 2016 at 20:41

oops, i meant B.voice() – Arquebus 9/9, 2016 at 20:47

@El Sam B cannot be resolved An error occurred at line: 36 ; 36: <%= B.voice()%> – Samaniego 9/9, 2016 at 20:51

The problem was the = , it's only used when you want to print a variable, instead you want to call a method and to do it you only use the scriptlet , i.e <% someMethod();%> – Arquebus 9/9, 2016 at 21:0

@El Sam Now, when I <% B.voice();%> the <%@ page import="boxers.B" %> usddenly causes error - Only a type can be imported. boxers.B resolves to a package. When I replace it with %@ page import="boxers.*" %> it gives an old thing: An error occurred at line: 35 in the jsp file: /web/date_info.jsp B cannot be resolved, 35: <% B.voice();%> – Samaniego 9/9, 2016 at 21:11

you must keep the class import <%@ page import="boxers.B" %>, for the scriptlet , try this <% String msg = B.voice();%> <%=msg%> – Arquebus 9/9, 2016 at 21:21

@El Sam An error occurred at line: 35 in the jsp file: /web/date_info.jsp B cannot be resolved 35: <% String msg = B.voice();%> and import: An error occurred at line: [14] in the generated java file Only a type can be imported. boxers.B resolves to a package It sucks( – Samaniego 9/9, 2016 at 21:23

This error is really getting ridiculous, I found a solution on SO, try this <%@ page import="boxers.B;" %> notice the semicolon after B – Arquebus 9/9, 2016 at 21:28

@El Sam HTTP Status 500 - Unable to compile class for JSP remained, but there is no word about B class or boxers package, only exception and root cause things, which were present before. PS Do you have Netbeans&Tomcat? If yes. does my initial example work for you? I begin to contemplate reinstalling everything.. – Samaniego 9/9, 2016 at 21:33

In which line does the root cause lie ? for my java,JavaEE projects , I sue Intellij, and yes I have Tomcat. I recommend you to remove the static from the method and create an instance of you class like so <% String msg = new B.voice();%> – Arquebus 9/9, 2016 at 21:41

No line. Just java.lang.IllegalArgumentException: Page directive: invalid value for import... I googled it, looks like the semicolon causes it.. Tried non-static method out. It's all the same. With semicolon - gives the abovementioned exception, without - Only a type can be imported. boxers.B resolves to a package and An error occurred at line: 36 in the jsp file: /web/date_info.jsp B cannot be resolved to a type

35:           <%! 36:               B e=new B(); 37:               %> 38:                39:           <p><% String msg = e.voice();%></p>

– Samaniego 9/9, 2016 at 21:49

this is definitely not a JSP problem, it has to do with your netbeans+tomcat , I recommend you delete these files, clean, create others. check this thread, it has a lot of possible answers same problem – Arquebus 9/9, 2016 at 22:0

@El Sam I'll check it out. Thanks for your efforts.. – Samaniego 9/9, 2016 at 22:35

Figured it out. The application wasn't deployed correctly. The deployment process, described here helped me out. In particular - copying web application archive file (.war) and copying unpacked web application directory. My main mistake was that initially I applied the second method in the wrong way - copied all the folders in the app directory, created by Netbeans (build, src, web etc), while only NetbeansProjects/app_name/build/web's content should have been copied into tomcat/app_name/. Or just copy the war-file of NebeansProjects/app_name/dist/ into tomcat/webapps - the tomcat will create the appropriate folder with the files himself seconds later.

tl;dr: wrong deploment, copypaste war or web's content.

Samaniego answered 10/9, 2016 at 12:24 Comment(0)

Hot tags

Godot Unity Godot Help Programming Godot 4.X GUI GDScript 3D 2D Physics CSharp Godot 3.X VR XR Projects C++

Recommended topics

Hot tags