Matthias, I can reproduce the problem by using a new installation of Eclipse 3.5.1. I think the problem is that the Eclipse Update Manager cannot find the jar for the Deployment Descriptor Editor in the update site(s).
To avoid this problem, Apache UIMA should provide an "archived" update site file so that the user can download and "locally" install the plug-ins instead of completely depend on the mirror/download sites. Here is an alternative way to install the Deployment Descriptor Editor: 1. Download the UIMA-AS http://www.bizdirusa.com/mirrors/apache/incubator/uima/binaries/uima-as-2.2.2-incubating/uima-as-2.2.2-incubating-bin.zip 2. Unzip and copy the following 2 jars to your Eclipse's "dropins" directory (like for example eclipse\dropins): - eclipsePlugins/org.apache.uima.deployeditor_2.2.2.incubating.jar - eclipsePlugins/org.apache.uima.runtime-deployeditor_2.2.2.incubating.jar 3. Restart your Eclipse with -clean option. Please let me know if these steps can solve your problem. -- Tong
