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This webservice coding returns you all roles for a certain user:

package getRolesForUser;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.CreateException;
import com.sap.security.api.IRole;
import com.sap.security.api.IRoleFactory;
import com.sap.security.api.IUser;
import com.sap.security.api.UMFactory;

import java.util.ArrayList;
import java.util.Iterator;

/**
 * @ejbHome <{getRolesForUser.GetRolesForUserHome}>
 * @ejbLocal <{getRolesForUser.GetRolesForUserLocal}>
 * @ejbLocalHome <{getRolesForUser.GetRolesForUserLocalHome}>
 * @ejbRemote <{getRolesForUser.GetRolesForUser}>
 * @stateless 
 * @transactionType Container
 */
public class GetRolesForUserBean implements SessionBean {

	public void ejbRemove() {
	}

	public void ejbActivate() {
	}

	public void ejbPassivate() {
	}

	public void setSessionContext(SessionContext context) {
		myContext = context;
	}

	private SessionContext myContext;
	/**
	 * Business Method.
	 */
	public String[] getPortalRolesForUser(String userGID) throws Exception{

		// create array list
		ArrayList RoleList = new ArrayList();
		String UniqueID = new String();
		try {
                        // get roles of user
			Iterator rit = null;
			IUser user = UMFactory.getUserFactory().getUserByLogonID(userGID);
			rit = user.getRoles(true);
			IRoleFactory rfact = UMFactory.getRoleFactory();
	                //adding roles of user to the array list 
               		while (rit.hasNext()) {
				String roleName = (String) rit.next();
				IRole role = rfact.getRole(roleName);
				UniqueID = role.getUniqueID();
				RoleList.add(UniqueID);				
			}
			
			// create new array of data type string with the corresponding size
			String[] returnList = new String[RoleList.size()];
                        // move ArrayList into the created array
			RoleList.toArray(returnList);
			// return the portal roles of the user
			return returnList;			
		}
		// throw exception if an error occurs
		catch (Exception e) {
			throw new Exception(e);
		}
	}

/**
 * Create Method.
 */
public void ejbCreate() throws CreateException {
	// TODO : Implement
}

}
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