Java Programm doesn't start when not in default package

[Sascha Balkau]

Hi,
I was asking this a couple of posts before in an old thread but I guess nobody took notice so I'd like to try it once more with it's own topic ...

When I compile a class which is in the default package, everything works but if it's not in the default package I get the following error when I try to run the class ...

E:\Works\Eclipse\Java Test\bin\testpack>java Test
Exception in thread "main" java.lang.NoClassDefFoundError: Test (wrong name: testpack/Test)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(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)

Does anyone have a hint what I should do to make it run?
Also when I run it in Eclipse, it works so I guess the problem has a relation to a classpath that is not included. But I have no clue how I should tell Java how to handle the package path.

Would be nice to get some help on this since it really keeps me from progressing at all.

Thanks!
Sascha

[Jesper de Jong]

Instead of this:

E:\Works\Eclipse\Java Test\bin\testpack>java Test

try this:

E:\Works\Eclipse\Java Test\bin>java testpack.Test

i.e., run it from the "bin" directory and include the package name.

[Sascha Balkau]

Thanks Jesper! Yes, that way it works! I guess then to able to execute the program with just 'Java Test' I need to put it in a Jar file!??

[Jesper de Jong]

If you don't want to type the whole package name in front of the class name, you could package all your classes in a JAR file. You'd have to include a manifest file into the JAR file with an entry that looks like this:

Main-Class: testpack.Test

Then you could run the application by using a command line like this:

java -jar myjarfile.jar

To learn more about JAR files, see JavaTM Archive (JAR) Files in the JDK documentation.

[Layne Lund]

Originally posted by Sascha Balkau:
Thanks Jesper! Yes, that way it works! I guess then to able to execute the program with just 'Java Test' I need to put it in a Jar file!??

Even if you put the Test.class file in a JAR file, you still have to use the package name when you run the program. Jesper's suggestion makes it so you don't have to type as much on the command-line, but you STILL need to specify the package name along with the class even though it is done in the manifest file instead.

Layne