I need to start a H2 database as a pre-step. So I add an "execute shell" pre-step with the following content:
java -Xmx64m -classpath ~/.m2/repository/com/h2database/h2/1.4.192/h2-1.4.192.jar org.h2.tools.Server -tcp -tcpPort 3139 &
Sometimes this works fine (the database is started --> all tests green), sometimes this silently fails (database is not startet --> tests are red)