title: Why this NumberFormatException?
body: <p>I have this stack trace (part of)</p>
  
  <pre><code>Servlet.service() for servlet action threw exception
  java.lang.NumberFormatException: For input string: "37648"
   at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
   at java.lang.Long.parseLong(Long.java:403)
   at java.lang.Long.valueOf(Long.java:482)
   at java.lang.Long.decode(Long.java:593)
  </code></pre>
  
  <p>in one of my logfile
  I don't know what was real input string.
  But the user had made happen the same stack trace.</p>
  
  <p>How such a stacktrace can happen?</p>