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    private Map<String, Object> _getAllKnownProperties(Environment env) {
        Map<String, Object> rtn = new HashMap<>();
        if (env instanceof ConfigurableEnvironment) {
            for (PropertySource<?> propertySource : ((ConfigurableEnvironment) env).getPropertySources()) {
                if (propertySource instanceof EnumerablePropertySource) {
                    for (String key : ((EnumerablePropertySource) propertySource).getPropertyNames()) {
                        rtn.put(key, propertySource.getProperty(key));
                    }
                }
            }
        }
        return rtn;
    }