jsp "unable to compile" and "cannot be resolved to a type"

Question

I have a jsp file that imports from my package folder inside my classes directory. When I try to use it, i get the "Unable to compile" and "cannot be resolved to a type" errors. Here are my code.

<%@ page language="java" import="cs5530.*" %>
<html>
<head>
<script type="text/javascript">
function showInvalid()
{
    document.getElementById("invalid").style.display = 'block';
    document.getElementById("loginForm").reset();
}
</script>
</head>
<body>
<p>Welcome to FlixNet. Sign In</p>
<form name="loginForm" method="post" action="index.jsp">
    User Name: <input type="text" name="username"><br>
    Password: <input type="Password" name="password"><br>
    <input type="submit" value="Submit">
    <div id="invalid" style="display:none">
        <p>Invalid username or password</p>
    </div>
</form>
<%
Connector con = new Connector();
con.closeConnection();
%>
</body>
</html>

this is the error

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 23 in the jsp file: /index.jsp
Connector cannot be resolved to a type
20:     </div>
21: </form>
22: <%
23: Connector con = new Connector();
24: con.closeConnection();
25: %>
26: </body>


An error occurred at line: 23 in the jsp file: /index.jsp
Connector cannot be resolved to a type
20:     </div>
21: </form>
22: <%
23: Connector con = new Connector();
24: con.closeConnection();
25: %>
26: </body>


Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    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:717)

this is my file structure

public_html
    index.jsp
    |WEB-INF
        |classes
             mysql.jar
            |cs5530
                Connector.java
                Connector.class
                other java and class files.

my Connector class is under the package cs5530 so that isn't the issue. The connector class is a simple db connector class that I have tested and it works.

Is you jar under classes?It should be under lib. – Jaydeep Rajput Apr 13 '13 at 07:23 — Jaydeep Rajput, Apr 13 '13 at 07:23
Change your package name once. – Nikhil Agrawal Apr 13 '13 at 08:33 — Nikhil Agrawal, Apr 13 '13 at 08:33

score 1 · Answer 1 · answered Jul 12 '13 at 16:56

1

copy the jar in WEB-INF/lib/ directory and then restart your web container

answered Jul 12 '13 at 16:56

Gaurav Sharma

745
7
23

score 0 · Answer 2 · answered Apr 13 '13 at 07:14

0

Please check whether Connector.class is really imported. It looks like that you have not imported it.

answered Apr 13 '13 at 07:14

UVM

9,776
6
41
66

score 0 · Answer 3 · answered Apr 13 '13 at 07:18

0

Try

<%@ page import="cs5530.*" %>

answered Apr 13 '13 at 07:18

Jaydeep Rajput

3,605
17
35

score 0 · Answer 4 · answered Apr 13 '13 at 07:25

0

This was a result of me not being in charge of my Tomcat server. Apparently it needs to be cleaned if something major changes. My code was spotless.

answered Apr 13 '13 at 07:25

Bibodha

51
1
1
7

But your question had dark spots ;) – AllTooSir Apr 13 '13 at 07:27
This might be a separate thread, but I don't understand what the "Tomcat server" has to do with a compile error. Can someone explain that? I am seeing the same error. I thought that the Eclipse IDE compiler would be separate from the server. The server wouldn't even see the code until i drop in the compiled jar file. ??? – Baruch Atta Aug 20 '15 at 18:08

score 0 · Answer 5 · answered May 28 '14 at 22:35

This is because the xxx.jar file that describes the package you're trying to import has to be directly in the lib folder. e.g.: WebContent/WEB-INF/lib/xxx.jar. If it can only find the package folder inside the /lib then even though your .jar is inside this package folder that is still enough to create the error that it can only resolve to a 'package' and cannot resolve to a 'type'.

score 0 · Answer 6 · answered Jul 09 '18 at 01:13

You are missing imports at top of your .jsp file:

<%@ page import="packageWhatever.packageWhatever.ClassName" %>

Simplified example of problem:

JSP FILE:

TOMCAT_PRJ_DIR\src\main\webapp\index.jsp

WRONG:

<html><body><h1> 
    <%= Main.TEST_FUNCTION() %>
</h1></body></html>

CORRECT:

<%@ page import="launch.Main" %>
<html><body><h1> 
    <%= Main.TEST_FUNCTION() %>
</h1></body></html>

FILE BEING IMPORTED:

TOMCAT_PRJ_DIR\src\main\java\launch\Main.java

package launch;
.... imports here ....

public class Main {

    public static final String
    TEST_FUNCTION(){
        return( "[TEST_FUNCTION]" );
    };

    ...other code...   
};

Stack Used: Java+Tomcat+Maven

jsp "unable to compile" and "cannot be resolved to a type"

6 Answers6

TOMCAT_PRJ_DIR\src\main\webapp\index.jsp

TOMCAT_PRJ_DIR\src\main\java\launch\Main.java

Linked