Search Role Key Based on Role Name in OIM11gR2

Search Role Key based on Role Name in OIM11gR2-
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public String searchRolekey(String roleName)
{
System.out.println("************Inside Fetch Role***************");

Thor.API.Operations.tcGroupOperationsIntf _groupService =  oimClient.getService(Thor.API.Operations.tcGroupOperationsIntf.class);

HashMap<String, String> roleMap = new HashMap<String, String>();

System.out.println("*********Role Name is*********: "+roleName);
roleMap.put("Groups.Role Name", roleName);

String roleKey="";
tcResultSet roleResultSet = null;
try {
roleResultSet = _groupService.findGroups(roleMap);
//String[] CNameforRole=roleResultSet.getColumnNames();
groupKey = roleResultSet.getStringValue("Groups.Key");
System.out.println("********Role key is********: "+groupKey);

}
catch (tcColumnNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (tcAPIException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return roleKeyKey;

}