无法编译简单的JFACE程序； java.lang.NoClassDefFoundError

Question

I am trying to run a very simple JFace program:

import org.eclipse.jface.window.*;
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

public class HelloSWT_JFace extends ApplicationWindow{

    public HelloSWT_JFace(){
        super(null);
    }
    protected Control createContents(Composite parent){
        Text helloText = new Text(parent, SWT.CENTER);
        helloText.setText("Hello SWT and JFace");
        parent.pack();
        return parent;
    }
    public static void main(String[] args) {
        HelloSWT_JFace awin = new HelloSWT_JFace();
        awin.setBlockOnOpen(true);
        awin.open();
        Display.getCurrent().dispose();

    }

}

As far as I know, all the libraries are installed and the code, in Eclipse, gives me no errors. Nonetheless, when I run I get

and the long error report:

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IProgressMonitor
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.IProgressMonitor
    at java.net.URLClassLoader$1.run(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)
    ... 6 more

Does anyone know what could be causing this?

Please note; I took a look at THIS question and followed the solutions, but installing Equinox plugins did not work.

Answer 1

Thanks to the links Baz provided, I found the solution by making sure all the necessary Jars were added (I was missing a couple).

The necessary jars are:

org.eclipse.core.commands_<version info>.jar
org.eclipse.equinox.common_<version info>.jar
org.eclipse.jface_<version info>.jar
org.eclipse.osgi_<version info>.jar
org.eclipse.ui.workbench_<version info>.jar 

More info can be found at the link Baz provided: "Identify the Required External JAR Files for SWT and JFace"