There were two build errors... The first (per the subject of the bug) is fixed by adding a build (and I assume run-time) dependency on libcommons-collections-java
The second (a few lines later in the build output) is due to ant.properties calling out the version of jsp.jar that is provided by libservlet2.5-java, whereas the debian/control specified a dependency on only libservlet3.0-java. I fixed this by calling out version 2.2 rather than 2.1 in ant.properties (assuming the intention was to change from libservlet2.5 to libservlet3.0). Roddy
