java command not finding jar file

[Marlon Churchill]

Hi,

I have a class that uses packages inside a jar file.

The class compiles but when I try to run java I get the error message ClassNotFoundException.

Here are the commands:

C:\Users\Marlon\workspace\javacow>javac DaysOld.java -cp ./jr.jar

C:\Users\Marlon\workspace\javacow>java DaysOld 2007/3/17
Exception in thread "main" java.lang.NoClassDefFoundError: com/javaranch/common/
GDate
at DaysOld.main(DaysOld.java:9)
Caused by: java.lang.ClassNotFoundException: com.javaranch.common.GDate
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)
... 1 more

C:\Users\Marlon\workspace\javacow>java -cp ./jr.jar DaysOld 2007/3/17
Exception in thread "main" java.lang.NoClassDefFoundError: DaysOld
Caused by: java.lang.ClassNotFoundException: DaysOld
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: DaysOld. Program will exit.

import java.io.Console;
import com.javaranch.common.*;
public class DaysOld
{
public static void main(String[] args)
{
if (args.length > 0)
{
GDate birthday= new GDate(args[0]);
GDate today = new GDate();
JDate daysbirth = new JDate(birthday);
JDate daysto = new JDate(today);
int days = daysto.get() - daysbirth.get();
System.out.println("Your birthday is " + birthday.toString());
System.out.println("Today is " + today.toString());
System.out.println("Days since birth " + days);
}
}
}

In the first command it seems java can't find the GDate class, and in the second example java can't find the DaysOld class. It seems odd it can compile but can't run. DaysOld and jr.jar are in the javacow directory.

[Rob Spoor]

Try the following:

C:\Users\Marlon\workspace\javacow>javac -cp jr.jar DaysOld.java

Options go before the source file(s).

C:\Users\Marlon\workspace\javacow>java -cp .;jr.jar DaysOld 2007/3/17

By using -cp the current directory is no longer automatically part of the class path. You need to add it manually. That's what the extra ".;" is for.

Also, in both examples: either use .\jr.jar or just jr.jar. A slash (/) doesn't work within the Windows command prompt.

[Marlon Churchill]

 

Rob Spoor wrote:Try the following:

C:\Users\Marlon\workspace\javacow>javac -cp jr.jar DaysOld.java

Options go before the source file(s).

C:\Users\Marlon\workspace\javacow>java -cp .;jr.jar DaysOld 2007/3/17

By using -cp the current directory is no longer automatically part of the class path. You need to add it manually. That's what the extra ".;" is for.

Also, in both examples: either use .\jr.jar or just jr.jar. A slash (/) doesn't work within the Windows command prompt.

Thanks! The option -cp .;jr.jar worked! Didn't know that about the / in windows - thought they were interchangeable for some reason.