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Exception in thread "main" java.lang.NoClassDefFoundError

A friend of mine wanted to start to learn java, and I wanted to help him, so we created a simple Hello World example.

public class Hello {

public static void main(String argv[]) {

System.out.println("Hello world !");

}

then, when you compile it:

> javac Hello.java

and want to execute it:

> java Hello

Exception in thread "main" java.lang.NoClassDefFoundError: Hello

We set the CLASSPATH and JAVA_HOME enviroment variable correctly, and the problem was still the same..
When we copied the Hello.class into a lib directory of JAVA_HOME, it worked, but not from the current directory !

We tried different versions of java.. and do you know where this stupid problem is?

in the CLASSPATH there should be:
CLASSPATH=.;c:\programme\jboss\lib;c:\programme\
j2sdk1.4.2_08\lib;c:\programme\j2sdk1.4.2_08\jre\lib; ...

yes.. a dot .. it means, that it will search for classes bytecode in the current directory !

you can also tell java to search the current directory with the -classpath parameter

> java -classpath . Hello

Problems like this can really discourage java newbies, and that moment was very embarassing :)

Comments

Add New

RSS

Thanks

Deepak (59.160.195.xxx) 2008-01-31 12:51:55

It was really helpful. Thanks a lot.

Reply Quote

java error

avesh (210.212.163.xxx) 2008-03-26 04:52:49

SET PATH=C:\j2sdk1.4.2_05\bin

SET CLASSPATH=C:\j2sdk1.4.2_05\bin

SET JAVA_HOME=C:\j2sdk1.4.2_05

To solve java runtime error type above codes
null

Reply Quote

Anil (203.11.131.xxx) 2008-05-30 11:59:33

Thanks !

Reply Quote

java error

rishi (125.16.130.xxx) 2008-07-04 08:49:50

in command promt go to ur folder whr ur java file exist and write this
set classpath=%classpath%;.;

best of luck for java programming.

Reply Quote

Thanks a Lot

ZutoKido (200.84.135.xxx) 2008-08-03 19:16:44

It was really helpful! Thanks!!!

Reply Quote

Error

Jessiecca (192.8.215.xxx) 2008-08-07 11:24:39

Thanks a lot... it was of great help

Reply Quote

sandhya (61.17.44.xxx) 2008-08-27 11:54:14

:grin Thanks for this solution

Reply Quote

aLumma (83.226.201.xxx) 2008-09-02 23:12:14

thanks a lot!

what is the "CLASSPATH" variable doing? does it have to read "SET" in front? it doesn't here, and i dont't have the "JAVA_HOME" variable either, should i put it in??

sorry if these questions are beyond stupid, but i'm totally new to java!

.a

Reply Quote

Anna (83.139.18.xxx) 2008-09-30 13:44:13

Thanks a lot!!!!!!!!!!!! That was very helpfull.

Reply Quote

varvar (130.212.3.xxx) 2008-10-02 08:18:38

Thanks a ton dude!
even i was stuck at this silly silly point

Thanks again

Reply Quote

sek

SEKHAR (203.123.186.xxx) 2008-10-10 08:17:32

hi folks ,
thanks for u r useful comments.
but any one here tell me what's the difference between these 3 paths
1.JAVA_HOME
2.CLASSPATH
3.PATH

Reply Quote

thanks (129.110.199.xxx) 2008-10-11 09:38:37

Thanks a lot!

Reply Quote

Shamus (69.169.132.xxx) 2008-10-22 03:07:27

MUCHAS GRACIAS!

Reply Quote

Error

Sneha (12.37.22.xxx) 2008-10-23 00:34:10

Thank you.. This is really helpfull for me a Newbe to java.

Reply Quote

nisha (203.200.19.xxx) 2008-11-10 13:20:18

Thanx aloooooooot.........its been a great help

Reply Quote

Reaper (147.32.221.xxx) 2008-11-10 16:32:18

finally it works, after searching thousands of sites on net, it solved this easy one. thx, thx, thx a lot

Reply Quote

jdbc

jyothi (117.195.199.xxx) 2009-01-15 08:16:50

hi guys,
m unable to rectify the error even now after doing all alternative techniques.plz help me m gvng my program below:

import java.sql.*;
import java.io.*;
import java.util.*;
public class JDBCExample1{
public static void main(String args[]) throws Exception
{
FileInputStream fis=new FileInputStream("config.properties");
Properties props=new Properties();
props.load(fis);
String vdriver=props.getProperty("driver");
String vuname=props.getProperty("uname");
String vpwd=props.getProperty("pwd");
String vurl=props.getProperty("url");
Class.forName(vdriver);
Connection con=DriverManager.getConnection(vurl,vuname,vpwd);
System.out.println(con.getClass());
con.close();
}
}

config.properties

String driver=Oracle.jdbc.driver.OracleDriver
String uname=system
String pwd=tiger
String url = jdbc:oracle:thin:@localhost:1521

Reply Quote

Song Toan (141.228.250.xxx) 2009-01-21 09:00:54

I'm a new guy to Java using JDK 6 in Windows. I stuck here few hours for this issue. None of the solutions found from Internet solved. Finally, I got it worked.

There are 2 ways:

1) Set CLASSPATH environment to C:/Program Files/Java/jdk1.6.0_11/jre/lib;./;
Your jdk installation may be at different location.

2) Use -cp option:
java -cp "C:/Program Files/Java/jdk1.6.0_11/jre/lib;./;"

Pay attention at the "./" at the end of the paths in both solutions.

Conclusion: The java.exe does not take current directory by default! We have to add it into by ourselve!

Hope this save times of many many new guys like me!

Reply Quote

got it

lokesh (117.197.208.xxx) 2009-01-30 17:46:22

thank s dude

Reply Quote

Ramya NR (122.164.29.xxx) 2009-01-30 18:14:01

Thank u. This was a very useful solution for my long time struggle with the java s/w. Most don't know this logic. thanks again.

Reply Quote

help please

ashiq (155.35.46.xxx) 2009-02-03 12:17:16

I am struck even i change the variables i am getting the same error
i am completely new to java can you help me
the error is:
Exception in thread "main" java.lang.NoClassDefFoundError: Hello

Reply Quote

Thanks

Dang Tuan (210.245.54.xxx) 2009-02-13 02:30:08

I've tried the command: set classpath=%classpath%;.;

It works! Amazing

Thanks.

Reply Quote

KK (88.224.243.xxx) 2009-03-26 14:47:55

set classpath=%classpath%;.;

it works thanks a lot

Reply Quote

Shashank Sawant (70.185.117.xxx) 2009-05-25 08:23:09

I tried all the solution mentioned above but my problem still persists. Here is what I did in detail:
When I tried to compile my HelloWorldApp.java file using the following command:
javac HelloWorldApp.java
it worked (for being able to do this simple thing I had to change a lot of variables).

But then when I tried to Run the program using:
java HelloWorldApp
it gave me the error:
Exception in thread "main" java.lang.noclassdef...
...
...
...

To solve this error I tried various commands like:
set classpath=%classpath%;.;
java -classpath . HelloWorldApp
java -classpath . HelloWorldApp.class

but to no avail. Can anyone help me out with this problem?

Regards,

-sgsawant

Reply Quote

Gajanan (198.22.122.xxx) 2009-09-03 23:58:46

Thanks so much I had same problem. Really stupid problem which can discourage you .

Reply Quote

padmakar vishe (59.161.13.xxx) 2009-09-25 20:58:28

Thanks...a....lot...

Reply Quote

dharmendra (117.199.145.xxx) 2009-10-03 12:48:51

many many thanks,

Reply Quote

nano (71.67.102.xxx) 2009-10-07 09:42:40

the problem was the missing dot "."
without dot, I think the JVM does not feel like searching the current working directory for the class.
YES, this can surely discourage the JAVA newbies.
I insanely wasted 1 hour over this problem in uninstalling and reinstalling the JAVA SE.

Reply Quote

GREAT TO SOLVE

FARAZ (118.103.231.xxx) 2009-10-16 10:04:03

I SOLVE THIS ERROR
HOW?
WAIT FOR MY NEXT COMMENT

FARAZ

Reply Quote

Elridge D (130.164.78.xxx) 2009-10-30 20:28:36

I was seeing this error even though i had the correct environment variables (PATH and JAVA_HOME).

I found that the issue had to do with where I was compiling my test class. I had it in a package (com.xyz.apps.test.setup), so the fix for me was that I needed to run the javac command at the same level as where the /com directory existed. I had tried to compile it from the level of where the class lived (inside /com/xyz/apps/test/setup). Also, i specified a destination directory and then ran the java command on the compiled class in that directory.

Reply Quote

Jack B (209.212.21.xxx) 2009-11-06 01:05:44

Thank you sooo much

Reply Quote

hmmmmmmm (68.78.181.xxx) 2009-11-25 06:36:05

i still dont get where to put these.. i put the CLASSPATH=.;c:\programme\jboss\lib;c:\programme\
j2sdk1.4.2_08\lib;c:\programme\j2sdk1.4.2_08\jre\l ib; in the variable name but whats the value.. i vid tut would be nice if you could make me one thanks

Reply Quote

Error

Abhi (115.108.2.xxx) 2009-11-26 22:31:18

Thanks a lot!!!

Reply Quote

sms

sms (122.160.104.xxx) 2009-11-30 06:16:45

It was really helpful! Thanks!!!

Reply Quote

sms

sms (122.160.104.xxx) 2009-12-01 08:58:14

Error
finally it works, after searching thousands of sites on net, it solved this easy one. thx, thx, thx a lot

Reply Quote

Prasad (192.223.163.xxx) 2010-02-26 14:31:50

Just found out one more problem while setting up CLASSPATH
SET CLASSPATH=C:/Program Files;
and
SET CLASSPATH="C:/Program Files"; BEHAVES very differently while executing from command prompt but works fine if environment variable is set with out text qualifier ("") and IDE is used for execution
If there is space between (Like Program Files) use text qualifier “C:\Program Files\Cognos\c8\webapps\p2pd\WEB-INF\lib” for path instead of C:\Program Files\Cognos\c8\webapps\p2pd\WEB-INF\lib

Reply Quote

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