private DataSource lookupDS(InitialContext ctx, String path) {
        try {
            return (DataSource) ctx.lookup(path);
        } catch (NamingException e) {
            return null;
        }
    }
Lookup the datasource from JNDI.
@param ctx
@param path
gateway/engine/policies/src/main/java/io/apiman/gateway/engine/policies/auth/JDBCIdentityValidator.java