Thread: Class Not found in jar

Hi everyone.
I have a jar file.
and i imported its classes to my program..
let say i have a code
source code is at /home/t_bmf/Java/src

import firstjar.FirstJarPrint;
 
public class TestJar {
        public static void main(String[] args) {
                //FirstJarPrint jar = new FirstJarPrint();
        }
}

well i have successfully compiled it using command below:
javac -cp ".:/home/t_bmf/Java/lib/FirstJar.jar" -d /home/t_bmf/Java/bin TestJar.java

it means that i don't have any compilation error right?
so all classes found properly.

But whenever I run the program I always got this error:
java -cp /home/t_bmf/Java/lib/FirstJar/jar:. TestJar
Exception in thread "main" java.lang.NoClassDefFoundError: firstjar/FirstJarPrint
at TestJar.main(TestJar.java:6)
Caused by: java.lang.ClassNotFoundException: firstjar.FirstJarPrint
at java.net.URLClassLoader$1.run(URLClassLoader.java: 202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 06)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 47)
... 1 more
I think it has to be no error since i have compiled the program successfully right?
if it really didn't find the class, then it must be a compilation error right?

is there something wrong with the way I execute the program??
Thank you!

note: i created the program in UNIX

Is there a mistake in the classpath. i.e.

should it be

javac -cp ".:/home/t_bmf/Java/lib/firstjar/FirstJar.jar" -d /home/t_bmf/Java/bin TestJar.java

instead of

javac -cp ".:/home/t_bmf/Java/lib/FirstJar.jar" -d /home/t_bmf/Java/bin TestJar.java

nope
i have a directory
/home/t_bmf/Java/lib :which must contains jar files.
/home/t_bmf/Java/src :which must contains java files.
/home/t_bmf/Java/bin :which must contains .class files.


i have created a jar file FirstJar.jar for testing only.
inside of that jar file is a package firstjar and in that package is where the FirstJarPrint.class is located
I think there was no mistaken in classpath.

I have tried this one:
I paste FirstJar.jar file to /home/t_bmf/Java/bin (which must contain only class file)
and i tried this command (in bin directory):
java -cp $CLASSPATH:.:FirstJar.jar TestJar
well, it works
I also remove the comment that makes me create an object of instance of FirstJarPrint and used all its method.
And it worked perfectly.

But i don't want this (having /home/t_bmf/Java/bin directory contain a jar file)
therefore i remove the jar file in /home/t_bmf/Java/bin.
and i tried this command:
java -cp $CLASSPATH:.:home/Java/lib/FirstJar.jar TestJar
but the same exception occurs again.
Exception in thread "main" java.lang.NoClassDefFoundError: firstjar/FirstJarPrint
at TestJar.main(TestJar.java:6)
Caused by: java.lang.ClassNotFoundException: firstjar.FirstJarPrint
at java.net.URLClassLoader$1.run(URLClassLoader.java: 202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 06)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 47)
... 1 more

is there something wrong with my command? thanks a lot

--- Update ---

i made it now.
it should be:

java -cp $CLASSPATH:.:/home/Java/lib/FirstJar.jar TestJar

instead of:

java -cp $CLASSPATH:.:home/Java/lib/FirstJar.jar TestJar

thank your ankurt.
you helped me again..

I am Happy to help you.