commons-file/src/main/java/info/monitorenter/util/StringUtil.java
public static boolean isEmpty(final String test) {
    boolean result;
    if (test == null) {
      result = true;
    } else {
      result = test.trim().length() == 0;
    }
    return result;
  }
public static boolean isEmpty(final String test) {
    boolean result;
    if (test == null) {
      result = true;
    } else {
      result = test.trim().length() == 0;
    }
    return result;
  }
Returns true if the argument is null or consists of whitespaces only.
<p>

@param test
the <code>String</code> to test.

@return true if the argument is null or consists of whitespaces only.