import error

[oszc]

hi,guys

this is an example from book but i can not figure out. Please help.
my package (Time1.class)is located in D:\Java\testImport\com\deitel\javafp\ch08
i creat a new class (named Time1PackageTest.java) containing the main method in a different folder(D:\Java\testImport2).

i cd to and execute D:\Java\testImport2>javac -cp D:\Java\testImport Time1PackageTest.java
it seems to be ok.
then i execute D:\Java\testImport2>java -cp D:\Java\testImport Time1PackageTest
the error occur:

Exception in thread "main" java.lang.NoClassDefFoundError: Time1PackageTest
Caused by: java.lang.ClassNotFoundException: Time1PackageTest
        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: Time1PackageTest.  Program will exit.

then i execute D:\Java\testImport2>java Time1PackageTest

error again:

Exception in thread "main" java.lang.NoClassDefFoundError: com/deitel/javafp/ch0
8/Time1
        at Time1PackageTest.main(Time1PackageTest.java:9)
Caused by: java.lang.ClassNotFoundException: com.deitel.javafp.ch08.Time1
        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

Time1 code:

package com.deitel.javafp.ch08;

public class Time1 {
	private int hour;
	private int minute;
	private int second;
	
	public void setTime(int h, int m, int s)
	{
		hour =( ( h>=0 && h < 24)?h:0 );
		minute = ( (m>=0 && m<60)?m:0 );
		second = ( (s>=0 && s<60)?s:0 );
	}
	
	public String toUniversalString()
	{
		return String.format("%02d:%02d:%02d", hour, minute, second);
	}
	
	public String to1String()
	{
		return String.format("%02d:%02d:%02d %s", ( (hour==0||hour==12)?12:hour%12 ), minute, second, hour>=12?"PM":"AM");
	}
}

Time1PackageTest code:

import com.deitel.javafp.ch08.Time1;
public class Time1PackageTest {

	public static void main(String[] args) {

		Time1 time1 = new Time1();
		
		System.out.println(time1.toUniversalString());
	}

}

[sunde887]

Type

java -cp . com/deitel/javafp/ch08/Time1PackageTest

[oszc]

Type

java -cp . com/deitel/javafp/ch08/Time1PackageTest

Time1.java in folder D:\Java\testImport
Time1.class in folder D:\Java\testImport\com\deitel\javafp\ch08
Time1PackageTest.class in folder D:\Java\testImport2

[Junky]

If you are in a parent directory then you would type

java -cp path\to\subdirectory className

Make sure you get the path correct and that you have spaces in the correct spots.

[Tolls]

then i execute D:\Java\testImport2>java -cp D:\Java\testImport Time1PackageTest
the error occur:

Exception in thread "main" java.lang.NoClassDefFoundError: Time1PackageTest
Caused by: java.lang.ClassNotFoundException: Time1PackageTest
        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: Time1PackageTest.  Program will exit.

This is because you only put the directory for the com.deitel.javafp.ch08.Time1 class in the class path, and don't include the current directory (ie the one with the Time1PackageTest class). So it fails to find the Time1PackageTest class.

then i execute D:\Java\testImport2>java Time1PackageTest

error again:

Exception in thread "main" java.lang.NoClassDefFoundError: com/deitel/javafp/ch0
8/Time1
        at Time1PackageTest.main(Time1PackageTest.java:9)
Caused by: java.lang.ClassNotFoundException: com.deitel.javafp.ch08.Time1
        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

In this case you are running without any defined classpath so it defaults to current directory (.). This means it can find Time1PackageTest, since it is in the current directory, but now it can't find the com.deitel.javafp.ch08.Time1 class.

You need both:
-cp .;D:\Java\testImport

[oszc]

Thank you guys and special thanks to Mr.Tolls. Your answer is quite clear.