Java.lang.NoClassDefFoundError: Exception in thread "main"

Hello People,
I am aware that this topic has been raised before. I have browsed through all the postings of this particular question, but i have not found the solution.
While compilign i get no errors but this is what i get when i run the java program.
java.lang.NoClassDefFoundError: Exception in thread "main"
Tool completed with exit code 1
The following is my path and classpath files under autoexec.bat
SET PATH=%PATH%;C:\j2sdk1.4.0_03\bin
SET CLASSPATH=.;%CLASSPATH%;C:\j2sdk1.4.0_03\bin
These are the settings i have in MY COMPUTER properties/environments
SYSTEM VARIABLES
Variable - classpath
Value - C:\Program Files\TextPad 4
USER VARIABLES
Variable - PATH
Value - C:\j2sdk1.4.0_03\bin
SYSTEM VARIABLES
Variable - path
Value - C:\PROGRA~1\PVCS\VM\win32\bin;C:\WINNT4\system32;C:\WINNT4;C:\WINNT4\system32\nls\ENGLISH;C:\WINNT4\system32\nls;C:\Program Files\Rational\common
USER VARIABLES
Variable - PATH
Value - C:\j2sdk1.4.0_03\bin
I hope this infromation will help.
Thanks
Regards,
Shah

SET PATH=%PATH%;C:\j2sdk1.4.0_03\bin
SET CLASSPATH=.;%CLASSPATH%;C:\j2sdk1.4.0_03\bin
These are the settings i have in MY COMPUTER
properties/environments
SYSTEM VARIABLES
Variable - classpath
Value - C:\Program Files\TextPad 4I am concerned that the classpath in the autoexec.bat is different from what you posted under System variables. What version of Windows are you running? autoexec.bat is used by 98. Others use the system variables. The classpath you show for autoexec.bat looks OK but the classpath you show for system variables looks wrong. It should be the same as what you show for autoexec.bat You do not need the sdk\bin directory in your classpath unless you plan to put classes there.
The NoClassDefFound error means that the java.exe command could not find the class that you specified. You did not post the command that you entered. You may have specified the class wrong. Otherwise, it is probably a classpath problem.

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Adding users to DefaultAuthenticator.
Connecting to t3://localhost:7001 with userid weblogic ...
Successfully connected to Admin Server 'tst2_as_server' that belongs to domain 'tst2_domain'.
Warning: An insecure protocol was used to connect to the
server. To ensure on-the-wire security, the SSL port or
Admin port should be used instead.
Creating new user: jdoe
Users created successfully.
Exiting WebLogic Scripting Tool.

Javax.servlet.ServletException & java.lang.NoClassDefFoundError

I am getting this javax.servlet.ServletException & java.lang.NoClassDefFoundError
exceptions while running jsp in .netbeans.
Iwas able to compile and run jsp pgms , but i am getting this error when i use jsp:useBean.I think the java class created is not in the proper path..netbeans is using tomcat server.The ide put the jsp's in the proper path. but it is not putting the java class i created with setter and getter methods.I also set the classpath. but din't work
I t is eating up my time!Pl. suggest me a solution!
Directory structure is :source file
c:/windows/.netbeans/3.5/samples/jsp
I guess the ide is putting all the class files(jsp) in
C:\WINDOWS\.netbeans\3.5\tomcat406_base\work\Tomcat-Internal\localhost\C_3A_5CWINDOWS_5C.netbeans_5C3.5_5Csampledir\JSP
so i copied the userData.class from source dir to the above directory.
and i also did the
set CLASSPATH= C:\WINDOWS\.netbeans\3.5\tomcat406_base\work\Tomcat-Internal\localhost\C_3A_5CWINDOWS_5C.netbeans_5C3.5_5Csampledir\JSP
in dos prompt
pl. find the code below.
Html:
<HTML>
<HEAD>
<TITLE>getData</TITLE>
</HEAD>
<BODY>
<form method = post action="saveData.jsp">
What's your Name : <input type=text name =username size=10>
<br>
What's Age : <input type=text name=age size=10>
<br>
What's ur email id : <input type=text name=email size=10>
<input type=submit>
</FORM>
</BODY>
</HTML>
SaveData.jsp
<jsp:useBean id="user" class="JSP.userData" scope="session"/>
<jsp:setProperty name="user" property="*"/>
<html>
<head><title>using bean</title></head>
<body>
--Continue
Thank u
</body>
</html>
userData.java
* userData.java
* Created on February 12, 2004, 1:06 PM
package JSP;
* @author amano
public class userData {
String userName;
int age;
String email;
/** Creates a new instance of userData */
public userData()
public void setUsername(String str)
userName=str;
public void setAge(int str)
age=str;
public void setEmail(String str)
email=str;
public String getUsername()
return userName;
public int getAge()
return age;
public String getEmail()
return email;

when i click on the submit button i get the following error msg.
Apache Tomcat/4.0.6 - HTTP Status 500 - Internal Server Error
javax.servlet.ServletException: JSP/user_data
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:349)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:226)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.netbeans.modules.web.monitor.catalina.MonitorValve.invoke(MonitorValve.java:148)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:534)
root cause
java.lang.NoClassDefFoundError: JSP/user_data
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Class.java:1610)
     at java.lang.Class.getConstructor0(Class.java:1922)
     at java.lang.Class.newInstance0(Class.java:278)
     at java.lang.Class.newInstance(Class.java:261)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.load(IDEJspServlet.java:106)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.loadIfNecessary(IDEJspServlet.java:150)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.service(IDEJspServlet.java:160)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.serviceJspFile(IDEJspServlet.java:246)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:339)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:226)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.netbeans.modules.web.monitor.catalina.MonitorValve.invoke(MonitorValve.java:148)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:534)

Java.lang.NoClassDefFoundError error on sun one 6.0 web server

Hello,
I'm trying to run a simple hello_world test but get an error message as follows
[17/Nov/2003:12:49:55] info (23151): Internal Info: loading servlet /test/hello_
world.jsp
[17/Nov/2003:12:49:56] failure (23151): Internal error: Unexpected error conditi
on thrown (java.lang.NoClassDefFoundError: sun/tools/javac/Main,sun/tools/javac/
Main), stack: java.lang.NoClassDefFoundError: sun/tools/javac/Main
at com.iplanet.server.http.servlet.IWSJavaC.compile(IWSJavaC.java, Compi
led Code)
at com.iplanet.server.http.servlet.IWSJavaCompiler.compile(IWSJavaCompil
er.java:73)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java, Compiled C
ode)
at com.iplanet.server.http.servlet.NSServletEntity.load(NSServletEntity.
java, Compiled Code)
at com.iplanet.server.http.servlet.NSServletEntity.update(NSServletEntit
y.java, Compiled Code)
at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunn
er.java, Compiled Code)
Here is my web-apps.xml file ->
# pg web-apps.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE vs PUBLIC "-//Sun Microsystems, Inc.; iPlanet//DTD Virtual Server Web
Applications 6.0//EN"
"http://developer.iplanet.com/webserver/dtds/iws-webapps_6_0.dtd">
<vs>
<web-app uri="/hello_world" dir="/nnn.nnn.nnn.nn/test" enable="true"/>
</vs>
Just erased ip just in case.
Has anyone experinced same behaviour?

What service pack of 6.0 server are you using? What is the JDK version? Try running the VM in server mode. Here's the docs to run JVM in server mode:
http://docs.sun.com/source/816-6770-10/rn60sp6.html#1017482
Hope it helps.
Thanks,
Manish

Exception in thread "main" java.lang.NoClassDefFoundError

Am using java 1.3.1 on Red Hat Linux 7.1
i get this error
Exception in thread "main" java.lang.NoClassDefFoundError
while running a simple program HelloWorld.java
help

When you use the "java" command, the only required argument is the name of the class that you want to execute. This argument must be a class name, not a file name, and class names are case sensitive. For example, "java HelloWorld.java" won't work because the class name isn't HelloWorld.java, it's HelloWorld. Similarly, "java helloworld" won't work because a class defined as "public class HelloWorld {" is not named helloworld due to case sensitivity. Finally, the .class file must be in a directory that is in the Classpath - that's where java.exe searches to find the file that contains the class.

Java.lang.NoClassDefFoundError: Exception in thread "main"

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