Compiling java program from command line passing args

Question

I wrote a simple java program

package abc.def.ghi 
public class Foobar{


   public String printS(String s){
     System.Out.println(s);

 public static void main(String [] args){
   String s = args[0];
   Foobar foobar = new Foobar();
    foobar.printS(s);
}

Now I did javac Foobar.java

It created a class file

and then I did

java Foobar

Didnt worked

 java Foobar hi //args

Didnt worked

java -cp . abc.def.ghi.Main

DIdnt worked.

Error I am getting is:

Exception in thread "main" java.lang.NoClassDefFoundError: abc/def/ghi/Main
Caused by: java.lang.ClassNotFoundException: com.intel.hadoop.graphbuilder.conf.Main
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: com.intel.hadoop.graphbuilder.conf.Main.  Program will exit.

Your problem has nothing to do with passing command line parameters. You have a classpath / package name issue — MrSmith42
– MrSmith42, Commented Jan 3, 2013 at 23:09

tckmn · Accepted Answer · 2013-01-03 23:18:18Z

3

Did you put your .class files in the path (path to project)/abc/def/ghi/Foobar.class?

NoClassDefFoundError: abc/def/ghi/Foobar

Looks like you didn't.

edited Jan 3, 2013 at 23:18

answered Jan 3, 2013 at 23:09

tckmn

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3 Comments

tckmn Over a year ago

@Fraz Move Main.class files to (path to project)/abc/def/ghi/Main.class perhaps?

Reinstate Monica -- notmaynard Over a year ago

It would be Foobar.class, not Main.class.

tckmn Over a year ago

@iamnotmaynard Oh, right. (reminds self to read question better)

Ian Roberts · Accepted Answer · 2013-01-03 23:16:43Z

1

If you compile using

javac -d . Foobar.java

then the compiler will put the .class file in the right directory to match its package name, then

java abc.def.ghi.Foobar

should run it successfully.

answered Jan 3, 2013 at 23:16

Ian Roberts

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