class Configuration {

    public void setDefaultExpectedInsertions(int defaultExpectedInsertions) {
        if (defaultExpectedInsertions <= 0) {
            throw new IllegalArgumentException("defaultExpectedInsertions: "
                    + defaultExpectedInsertions + " (expected: > 0)");
        }

        this.defaultExpectedInsertions = defaultExpectedInsertions;
    }

      Configuration();

}