private String lookupKey(String key) {
for (ConfigurationProvider cp : providers) {
String value = null;
try {
value = cp.getValue(key);
} catch (IOException e) {
log.warn(
String.format(
"Error retrieving value for \"%s\" from provider (%s)", key, cp.getName()),
e);
}
if (value != null) {
return value;
}
}
return null;
}
