asked on

cant run the compiled class, is it classpath?

The code as below is in c:\temp\temp\temp

I was able to compile it:

c:\ > javac c:\temp\temp\temp\class1.java

but when I try to run that class file with

c:\> java c:\temp\temp temp.class1

it gives out this error stack.

C:\>java -cp c:\temp\temp temp.class1
Exception in thread "main" java.lang.NoClassDefFoundError: temp/class1 (wrong na
me: temp/temp/temp/class1)
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$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: temp.class1. Program will exit.

I am at a loss to know why?

Thanks!

Roopesh

package temp.temp.temp;
 
public class class1{
 
public static void main(String[]arg)
{
System.out.println("Hello");
 
}
 
}

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SOLUTION

the_b1ackfox

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Kevin Cross

Change your package name to this (see code snippet).

Or change your execution to this:

c:\> java -cp . temp.temp.temp.class1

package temp;
 
public class class1{
 
public static void main(String[]arg)
{
System.out.println("Hello");
 
}
 
}

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perfect_tranquility

ASKER

btw now I have been able to run the class from anywhere in filesystem

1).C:\>java -cp c:\ temp.temp.temp.class1
2).C:\Program Files\Apoint>java -cp c:\ temp.temp.temp.class1

Both 1) and 2) above worked.

My question now essentially becomes :
why do I have to put in the entire class name along with packages if I use classpath. In other words if I navigate somewhere in file system why am I not allowed to do this:

C:\Program Files\Apoint> java -cp c:\temp\temp temp.class1

Thanks!

Roopesh

perfect_tranquility

ASKER

fox, visa: you both are right. I do not remember where from I copied that code.
This is the code that I am working with and getting the issues I outlined in the comment above

package temp.temp.temp;
public class class1{
public static void main(String[]arg)
{
System.out.println("Hello");
}
}

Thanks and sorry for that wrong code copied.

perfect_tranquility

ASKER

omg, my brain is not functioning properly i guess.
i see what you two are saying, you want me to change the package line, but plz explain what is wrong with

package temp.temp.temp;

when after all the class itself is in c:\> temp\temp\temp ?

Thanks

ASKER CERTIFIED SOLUTION

Kevin Cross

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SOLUTION

a_b

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Kevin Cross

That is a much better explanation. I haven't had any coffee today, so struggling. :) lol

Hopefully you get the drift though. You have to make your package name match how you are calling the class or make how you are calling match your package name. Have to be consistent.

perfect_tranquility

ASKER

visa: No, I dint copy that code. weird names like temp.temp.temp would usually be mine,lol
coffee i cant drink coz of medical issues, gave me runs for 2 days!

I am very positive I have gotten the point you made and forced it through the hippocampus at least.

Thanks a b for your link, I appreciate it. I would look at it for sure later when I go back home.

fox, you are right too, i just want a bit more text like visa :-) or a link where I can satiate my hunger for textual example.

Thanks all!
Roopesh