Packages

[Vasiq Molvizadah]

I wrote this simple program in a package and my directory structure is E:\Java\folder and my main class is inside folder package...the code of the program is

  package folder;

public class PackageTest
{
	PackageTest()
	{
	System.out.println("You are in constructor.");
	}
	
	public static void main(String[] args)
	{
	PackageTest packTest = new PackageTest();
	}
}  

When I'm trying to run this program from the current directory as folder...it gives me NoClassDefFoundError....Any help guys.....

[Sebastian Janisch]

First, if it compiles, the underlying package/folder structure should be fine.

Are you trying to run your program from the 'folder' folder or from the project's root path?

[Vasiq Molvizadah]

I'm running this class from the "folder" folder and even if I try to run it from Java folder which the parent directory of "folder"..it doesn't work...but there was no error while compiling....why at runtime..

[David Newton]

Most likely you're specifying the classpath incorrectly. Without knowing how you're *actually* trying to run it, though, it's impossible to help.

[Vasiq Molvizadah]

David Newton wrote:Most likely you're specifying the classpath incorrectly. Without knowing how you're *actually* trying to run it, though, it's impossible to help.

My directory structure where I stored this program is
E:
|
----->Java
|
-------->folder
|
------>Package.java

and I'm running the program from the folder package....it compiles fine but at runtime it gives an NoClassDefFoundError....

[David Newton]

Again, can't you just post the exact command line you're using? We cannot possibly know what you're doing wrong unless you TellTheDetails.

That said, don't run it from the "folder" directory, but the one above it.

[Vasiq Molvizadah]

David Newton wrote:Again, can't you just post the exact command line you're using? We cannot possibly know what you're doing wrong unless you TellTheDetails.

That said, don't run it from the "folder" directory, but the one above it.

This is what I'm getting after I tried to run the program.
E:\Java\folder>java PackageTest
Exception in thread "main" java.lang.NoClassDefFoundError: PackageTest (wrong name: folder/PackageTest)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
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$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)
Could not find the main class: PackageTest. Program will exit.

[David Newton]

Did you not see the second sentence in my response?

You still need to either specify the classpath (or, less preferentially, rely on the default, which I *think* is ".", hence why I told you to run it from a different directory).

[Vasiq Molvizadah]

David Newton wrote:Did you not see the second sentence in my response?

You still need to either specify the classpath (or, less preferentially, rely on the default, which I *think* is ".", hence why I told you to run it from a different directory).

It's working perfectly now..thanks a lot