Question

JSP error: java.lang.NoClassDefFoundError: user/UserData (wrong name: UserData)

Asked by: vrosas_03

I've looked all over and always find the same solution to this exact tutorial (http://www.jsptut.com/Forms.jsp) but it it doesn't work for me.   The main answer for this is to put the class into the WEB-INF\classes\user  directory.  However in Tomcat there are several WEB-INF directories  (I think seven)  I put the class into all of them but it still doesnt work.  

here's the error:
javax.servlet.ServletException: java.lang.NoClassDefFoundError: user/UserData (wrong name: UserData)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:275)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NoClassDefFoundError: user/UserData (wrong name: UserData)
      java.lang.ClassLoader.defineClass1(Native Method)
      java.lang.ClassLoader.defineClass(Unknown Source)
      java.security.SecureClassLoader.defineClass(Unknown Source)
      org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1850)
      org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
      org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
      org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
      org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1247)
      org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
      org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
      org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
      org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
      org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
      org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
      org.apache.jasper.compiler.Generator.generate(Generator.java:3426)
      org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:216)
      org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
      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:586)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

GetName.jsp
 
<HTML>
<BODY>
<p><FORM METHOD=POST ACTION="SaveName.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20><br/>
What's your email address? <INPUT TYPE=TEXT NAME=email SIZE=20><br/>
What's your age? <INPUT TYPE=TEXT NAME=age SIZE=20><br/>
</p><INPUT TYPE=SUBMIT>
 
</FORM>
</BODY>
</HTML>
 
 
 
SaveName.jsp file:
 
<jsp:useBean id="user" class="user.UserData" scope="session"/>
<jsp:setProperty name="user" property="*"/> 
<HTML>
<BODY>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>
 
 
UserData.java file which I compiled into a class:
 
package user;
 
public class UserData {
 
    String username;
    String email;
    String age;
 
    public void setUsername( String value )
    {
        username = value;
    }
 
    public void setEmail( String value )
    {
        email = value;
    }
 
   public void setAge( String value )
    {
        age = value;
    }
 
    public String getUsername() { return username; }
 
    public String getEmail() { return email; }
 
    public String getAge() { return age; }
 
}
 
NextPage.jsp
 
<jsp:useBean id="user" class="user.UserData" scope="session"/> 
<HTML>
<BODY>
You entered<BR>
Name: <%= user.getUsername() %><BR>
Email: <%= user.getEmail() %><BR>
Age: <%= user.getAge() %><BR>
</BODY>
</HTML>
                                  
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Asked On
2009-09-07 at 15:54:17ID24713489
Topics

Miscellaneous Web Development

,

Java Server Pages (JSP)

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Answers

 

by: vrosas_03Posted on 2009-09-07 at 16:45:26ID: 25277889

I got it working.  The problem was that I had entered the wrong classpath in the environmental variables.  I had put C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\WEB-INF\classes\user

when I removed the word user
changed it from ... ROOT\WEB-INF\classes\user
to                        ...ROOT\WEB-INF\classes

so it does matter what your classpath is set to in your environmental variables.  
I'm not sure if the the line:

package user;

user.UserData

20120131-EE-VQP-002

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