title: What can cause intermittent ORA-12519 (TNS: no appropriate handler found) errors
body: <p>We are running our Junit 4 test suite against Weblogic 9 in front of an Oracle 10 database (using Hudson as a continuous integration server) and occasionally we will get an ORA-12519 crash during script teardown.  However, the error is very intermittent:  </p>
  
  <ul>
  <li>It usually happens for the same Test class  </li>
  <li>It doesn't always happen for the same test cases (sometimes they pass)  </li>
  <li>It doesn't happen for the same number of test cases (anywhere from 3-9)  </li>
  <li>Sometimes it doesn't happen at all, everything passes  </li>
  </ul>
  
  <p>While I can't guarantee this doesn't happen locally (when running against the same database, of course), I have run the same suite of class multiple times with no issues.</p>
  
  <p>Any ideas?</p>