Problem:

OPERATION.TestInitializer - Couldn't create Lucene index
java.lang.NullPointerException
    at ch.systemsx.cisd.openbis.generic.server.coreplugin.JettyWebAppPluginInjector.findInjectionTargets(JettyWebAppPluginInjector.java:213)
    at ch.systemsx.cisd.openbis.generic.server.coreplugin.JettyWebAppPluginInjector.injectWebApps(JettyWebAppPluginInjector.java:125)
  
Solution:

ssh hudson
mkdir -p ~/hudson/gradle/openbis_oai_pmh/targets/www