java.lang.NoClassDefFoundError

[oll3i]

when i run prograam from eclipse it works fine but when i run it from command line i get





C:\ECLIPS~1\PD15\CLASSES\PD15>java D....
Exception in thread "main" java.lang.NoClassDefFoundError: D...(wrong nam
e: pd15/D...)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: D..... Program will exit.


thank You

[JosAH]

That's just a classpath error; make sure the classes you want to load and run are listed in your classpath variable. You can specify that variable on the command line of the java command; no need to set any environment variable.

kind regards,

Jos

[oll3i]

but this class is in the current folder

[JosAH]

@oll3i
So add '.' (a dot without quotes) to your classpath. Current directories don't mean much to the JVM. But are you sure the name of the class is ok? The exception stack trace is complaining about it.

kind regards,

Jos

[oll3i]

i have a dot in my classpath i also tried java -classpath . ClassName and still the same error

[JosAH]

@oll3i
The stack trace is complaining about a wrong class name; what is the exact name of your class file and the exact name of your class itself? There's something wrong there (most likely a wrong package).

kind regards,

Jos

[oll3i]

i removed package and it works

[JosAH]

@oll3i
If you have a class Name in package foo its name is foo.Name and the class file should be stored somewhere in a directory bar/foo/Name.class and the classpath should contain directory bar. You'd start running the class by starting the command: java -classpath bar foo.Name

kind regards,

Jos

[oll3i]

works :) thank You again