in alloydb-jdbc-connector/src/main/java/com/google/cloud/alloydb/InternalConnectorRegistry.java [234:240]
private Connector getNamedConnector(String name) {
Connector connector = namedConnectors.get(name);
if (connector == null) {
throw new IllegalArgumentException("Named connection " + name + " does not exist.");
}
return connector;
}