Can't deploy Scala Hello World

[Rich Oliver]

I have a java file:

public class MainJava {
    public static void main(String[] args)    {
        System.out.println("Hello, World");
        MainScala.f1();
   }
}

and a Scala file:

object MainScala {
   def f1 = println("Scala")
}

Compiles and runs in Eclipse as expected. If I comment out the MainScala.f1(); I can export the programme as a runnable jar and then run it:

ro@dhcppc4:~/workspace> java -jar hrun.jar

but if the Scala method is not commented out then when I run it from the command  line I get:

Exception in thread "main" java.lang.NoClassDefFoundError: scala/Predef$
        at MainScala$.f1(MainScala.scala:3)
        at MainScala.f1(MainScala.scala)
        at MainJava.main(MainJava.java:7)
Caused by: java.lang.ClassNotFoundException: scala.Predef$
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 3 more

I have included the Scala Library and ticked its check box on the Java build path. I'm using Eclipse 4.2.2, Scala plug-in 3.0, Scala 2.10.1 in Linux Opensuse 12.3

[Simon Schäfer]

It looks like the Scala library is not correctly linked. What is the
content of the JAR and what does the Manifest of the JAR contain?

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[Rich Oliver]

Ah I should have looked it doesn't seem to be including Scala Library Classes

there's just the one file for the java and 2 others ScalaMain$ and ScalaMain. Manifest as follows:

Manifest-Version: 1.0
Class-Path: .
Main-Class: MainJava

[Rich Oliver]

I've got it to work manually by adding the Scala Directory from the Scala Library jar from sbt to the runnable jar. But I can't workout how why Eclipse is not adding the Scala Library.