We failed to exclude the other commons-jelly, resulting in two almost

identical copies into WEB-INF/lib.

As a result, which one gets chosen is up to the file system /
classloader, and hence we failed to catch it sooner.

core/pom.xml

@@ -599,11 +599,6 @@ THE SOFTWARE.
         </exclusion>
       </exclusions>
     </dependency>
-    <dependency>
-      <groupId>org.jvnet.hudson</groupId>
-      <artifactId>commons-jelly</artifactId>
-      <version>1.1-hudson-20100305</version>
-    </dependency>
     <dependency>
       <groupId>org.jvnet.hudson</groupId>
       <artifactId>commons-jexl</artifactId>