Cactus and Commons-Httpclient
<!--
  Copyright 2004 The Apache Software Foundation

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<p>
<a href="http://jakarta.apache.org/cactus/">Cactus</a>
build 
<a href="http://www.mail-archive.com/cactus-dev%40jakarta.apache.org/msg04855.html">failed</a>
on Apache Gump.
After a few hours of debugging and thanks
to Leo for giving Vincent access to <a href="http://lsd.student.utwente.nl/gump/">LSD</a>,
<a href="http://www.mail-archive.com/cactus-dev%40jakarta.apache.org/msg04856.html">the cause was found</a>. The hunt is over!
</p>
<more/>
<p>
The cause was: <a href="http://jakarta.apache.org/commons/httpclient/">commons-httpclient</a>
</p><p>
Cactus works fine with version 2.0 of commons-httpclient but not with the
latest version from HEAD. </p><p>
It turns out that commons-httpclient HEAD (i.e. v3.x) is not going to be backward compatible
with v2.x and thus several APIs will be broken. The question has been
asked on 
<a href="http://www.mail-archive.com/cactus-dev%40jakarta.apache.org/">Cactus dev mailing list</a>
as to whether they stay on the 
<a href="http://lsd.student.utwente.nl/gump/commons-httpclient-20-branch/">2.x branch</a>
or follow 3.x. 
</p>