GWT - Line 60: No source code is available for type java.text.Normalizer; did you forget to inherit a required module?

Hi
I am working on a GWT project.

All my Implementation classes are put in com.my.web.server package and rest all my client code is written in com.my.web.client.* package.

//implementation class looks like this

public class LoginServiceImpl extends RemoteServiceServlet implements
		LoginService {
	public String isUserValid(String username, String password) {
//some db code
}
}

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response from server will come to onSuccess method as below. From that method I am invoking jaxb transformation. as I said all the class other then impl and DB class are put in  com.my.web.client.* package.
client code

public class LoginAsyncCallback implements AsyncCallback<String> {
public void onSuccess(String result) {
		// TODO Auto-generated method stub
		System.out.println(result);
		VOIndex Index = IndexFactory.getCaseIndex(result);
	}

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in myproject.gwt.xml
I have

 	<source path='client' />
	<source path='com.my.web.client.vo.factory' />
	<super-source path="jre" />

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When I run the application I get exception

/src/com/my/web/client/vo/factory/TransformIndex.java'
       [transcendweb] - Line 60: No source code is available for type java.text.Normalizer; did you forget to inherit a required module?
       [transcendweb] - Line 62: No source code is available for type javax.xml.bind.JAXBException; did you forget to inherit a required module?

TransformIndex.java has JaXB marshalling code.