@Override
    public Object get(String key, Object defaultValue) {
        Object value = System.getenv(getEnvironmentSafeKey(key));
        if (value == null) {
            value = defaultValue;
        }

        return value;
    }
Gets value from environment via {@link System#getenv}
@param key key to retrieve
@param defaultValue value to default to if none found
@return value found or default if none
core/src/main/java/com/github/dozermapper/core/config/resolvers/SystemEnvironmentSettingsResolver.java