JBDS installer no longer includes composite*.xml in its root folder, so the jar won't work as an offline update site (eg., for an offline install of JBDS IS into Eclipse)

org.eclipse.equinox.p2.core.ProvisionException: No repository found at jar:file:/home/nboldt/tmp/JBDS_Installers/jboss-devstudio-9.1.0.Beta2-v20160127-2213-B262-installer-standalone.jar!/.

Workaround:

use jar:file:/home/nboldt/tmp/JBDS_Installers/jboss-devstudio-9.1.0.Beta2-v20160127-2213-B262-installer-standalone.jar!/jbds/ as the update site path