CMS setters cannot work unless you setMaxMergeCount before you setMaxThreadCount

  public void setMaxThreadCount(int count) {
    ...
    if (count > maxMergeCount) {
      throw new IllegalArgumentException("count should be <= maxMergeCount (= " + maxMergeCount + ")");
    }

   public void setMaxMergeCount(int count) {
    ...
    if (count < maxThreadCount) {
      throw new IllegalArgumentException("count should be >= maxThreadCount (= " + maxThreadCount + ")");
    }