Run java app created in eclipse package structure in ubuntu terminal

1
votes

I am sure this is a very newbie question, but writing Java app after years. I have written a simple java code to print "HelloWorld"

public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println(" inside MAIN !!!");
}

Now I have created my project in eclipse & the structure is "/home/workspace/HelloWorld/src/com/android/test/helloworld/HelloWorld.java" & eclipse creates the .class at "/home/workspace/HelloWorld/bin/com/android/test/helloworld/HelloWorld.class". This runs successfully in Eclipse console. Now I want to run it though my Ubuntu 11.04 terminal. If i cd upto the .class parent folder & use java .HelloWorld, it throws an ClassNotFoundException

Exception in thread "main" java.lang.NoClassDefFoundError: /HelloWorld

Caused by: java.lang.ClassNotFoundException: .HelloWorld

If I write the same prog with the source file & class file generated in the same default package, I am able to run it through the terminal.

2
javaeclipseubuntuterminal

2 Answers

3
votes

cd /home/workspace/HelloWorld/bin/ and run 

java com.android.test.helloworld.HelloWorld

You must always use the classes with their full qualified name (package + class name)

0
votes

Also note the answer here: Runnable jar file generated by Eclipse wont execute?

Basically if you had Eclipse export your project as a "runnable jar" you can run it with:

java -jar YOURJAR.jar