CreteHTMLTextEditor.java

public TextEditor createHTMLTextEditor() {
	try {
		Class cls = Class
			.forName("org.eclipse.wst.sse.ui.StructuredTextEditor");
		for (Constructor constructor : cls.getDeclaredConstructors()) {
			if (constructor.getGenericParameterTypes().length == 0) {
				return (TextEditor) constructor.newInstance(new Object[0]);
			}
		}
	} catch (Throwable throwable) {
		// couldn't find the WTP plugin
	}

	return new TextEditor();
}

CreteHTMLTextEditorOSGi.java

private static final String HTML_EDITOR_ID = "org.eclipse.wst.sse.ui.StructuredTextEditor";

private static final String ATTRIBUTE_CLASS = "class";

private static final String ATTRIBUTE_ID = "id";

private static final String EDITOR_EXTENSION_POINT_ID = "org.eclipse.ui.editors";

public TextEditor createHTMLTextEditor() {
	try {
		IExtensionPoint extensionPoint = Platform.getExtensionRegistry()
			.getExtensionPoint(EDITOR_EXTENSION_POINT_ID);
		if (extensionPoint != null) {
			IConfigurationElement[] configurationElements = extensionPoint
				.getConfigurationElements();
			for (IConfigurationElement element : configurationElements) {
				if (StringUtils.equals(element.getAttribute(ATTRIBUTE_ID),
				HTML_EDITOR_ID)) {
					return (TextEditor) element
						.createExecutableExtension(ATTRIBUTE_CLASS);
				}
			}
		}
	} catch (Exception exception) {
		// couldn't find the WTP plugin
	}

	return new TextEditor();
}

MANIFEST.MF

Require-Bundle:
 ...
 org.eclipse.wst.sse.ui;resolution:=optional