import org.eclipse.ui.PlatformUI;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.SWT;

public class A extends org.eclipse.core.commands.AbstractHandler {

	public Object execute(ExecutionEvent event) throws ExecutionException {
		
		Listener buttonListener = new Listener() {
        	public void handleEvent(Event event) {
				// from inside handleEvent, I am unable to make any call to class B
				try {
					System.err.pritnln("constructor scenario");
					B myB = new B();

					System.err.println("non-static scenario");
					myB.nonStaticTest();

					System.err.println("static scenario");
					B.staticTest();
                                        System.err.println("end of static scenario");
				} catch (Exception e) {
					System.err.println("caught an exception");
				} finally {
					System.err.println("finally");
				}
			}
		};
                
                Display display = PlatformUI.getWorkbench().getDisplay();
                final Shell shell = new Shell(display, SWT.TITLE | SWT.MIN | SWT.CLOSE);
                Button myButton = new Button(shell, SWT.PUSH);
                myButton.addListener(SWT.Selection, buttonListener);
	}	
}

public class B {

public B() {
	System.err.println("constructor");
}

public static void staticTest() {
	System.err.println("static test");
}

public void nonStaticTest() {
	System.err.println("non-static test");
}

}

constructor scenario
finally

static scenario
finally