I have made a mistake: I have added swt.jar to the classpath Bootstrap entries and it caused the messages error above.
Now the error error message that subsist is much shorter:
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java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/Display
at HelloWorld.main(HelloWorld.java:22)
Exception in thread "main"
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isn't it a classpath error ?
I have checked that I added c:\swt.jar to the project libraries what else does it want

Java classpath is the most horrible invention

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I give the source of the program in case it's usefull:
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
public class HelloWorld {
public static void main(
String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
Label label = new Label(shell, SWT.NONE);
label.setText("Hello, World!");
shell.pack();
label.pack();
shell.open();
while(!shell.isDisposed())
if (!display.readAndDispatch())
display.sleep();
display.dispose();
label.dispose();
}
}