I was having an error when remotely deploying an application (tomcat 5.0.28) using the tomcat manager (via Ant tasks). I did not explicitly define a context.xml file for the application and used a more or less "out of the box" standard host configuration.
The tomcat error would say during deployment:
May 2, 2005 11:13:51 AM org.apache.catalina.startup.HostConfig deployWARs WARNING: Exception while expanding web application archive appname.war May 2, 2005 11:14:01 AM org.apache.catalina.startup.HostConfig deployWARs WARNING: Exception while expanding web application archive appname.war
[And repeat ...]
That was all the information it would give.
I believe this error resulted from tomcat attempting to deploy/unpack the application twice.
When I set autoDeploy="false" on the host (as opposed to the default behavior, which is true), the errors disappeared.
The relevant section of the documentation is below:
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/config/host.html#Automatic%20Application%20Deployment
"When using automatic deployment, the |docBase| defined by an XML Context <http://jakarta.apache.org/tomcat/tomcat-5.0-doc/config/context.html> file should be outside of the |appBase| directory. If this is not the case difficulties may be experienced deploying the web application or the application may be deployed twice.
Finally, note that if you are defining contexts explicitly, you should probably turn off automatic application deployment. Otherwise, your context will be deployed twice each, and that may cause problems for your app."
I did not define an explicit context, but I guess the implicit context (or generated context) defaults to a docbase inside the appbase directory, which results in the behavior described above.
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