CODEWITHSUNDEEP
javaclass
sathis
sathis

Reputation: 251

How to run java class file which is in different directory?

Directory path:

c:\home\test\src\com\bsoft\conc

I have my java program in src folder and I have my class file in conc folder. I need to run my java program from home folder.When I run I'm getting error:

could not find or load main class

Upvotes: 12

Views: 25959

Answers (6)

M. Gopal
M. Gopal

Reputation: 444

In Linux ( Simple scenario with out consider them as packages )

   > parent
         |
         |- stdlib
         |      |
         |      -Library.java
         |- Main.java

COMPILE FROM PARENT > javac -cp ./stdlib: Main.java

RUN FROM PARENT > java -cp ./stdlib: Main

Upvotes: 0

parsecer
parsecer

Reputation: 5106

The answers here don't touch on the spaces problem.

If your path has spaces, you must wrap it inside the quotes, otherwise an error would show up:

C:
 Program Files
    MyProject
       src
         testpackage
             Test.java
       target
         classes
             testpackage
                 Test.class

package testpackage;

public class Test  {
  public static void main(String[] args)  {
    System.out.println("Test");
  }
}

java -cp "C:\Program Files\MyProject\target\classes" testpackage.Test

Upvotes: 1

ducky duck
ducky duck

Reputation: 21

I had a similar problem where I was trying to run a Java program that calls a method in a class that is in another directory. I read this page and added the directory to my classpath, but I made the mistake of using '~' which in Bash means '/home/user/'.

So this command did NOT work

java -classpath ~/CurrentDirectory:OtherDirectory program

But this command did

java -classpath /home/user/CurrentDirectory:OtherDirectory program

Upvotes: 2

sathis
sathis

Reputation: 251

In my program com.bsoft.conc is a package name where my class file for the compiled program will be stored.If I have to run that from home folder we have to specify java -classpath test\src com.bsoft.conc."class-file-name"

This is because we need to tell the JVM where it has to look for class file.

so , we have to specify navigation to the src using "test\src" and then class file location "com.bsoft.conc.class-file-name"

If you have set environment variable in advanced settings then it will also be overriden if you specify classpath in cmd

Upvotes: 4

arjun99
arjun99

Reputation: 358

Set your class path for this java file:

java -cp C:\hello\build\classes com.javahowto.test.HelloWorld

or using Environment variables and run it from any third location from that machine.

Upvotes: 11

mtk
mtk

Reputation: 13709

It's time for you to read on about classpath ( a way to tell java compiler where to look for the class file you intend to run ). Basically there are two ways to set classpath

  1. a environment variable CLASSPATH having ':' separate directories in unix and ';' separated directories in windows
  2. -classpath or -cp command line arg to javac command

Refer and read the below links completely
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/classpath.html

Upvotes: 6

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