Hi, I got another bug about missing constructor: public …(P parameters, EngineContext engineContext) { super(parameters, engineContext); } so I looked into: org.ovirt.engine.core.bll.QueriesCommandBase and it seems, that sole 'problem' is with initialization of user in @PostConstruct method. It seems, that we can easily set all those fields via setters, and user initialization can be done later, for example before calling executeQueryCommand in: org.ovirt.engine.core.bll.QueriesCommandBase#executeCommand doing this will move us closer to CDI and avoid errors because of forgotten constructor. Is there a obstacle blocking us from doing this? thanks, Mar. Edit: I had some time left so I tried to implement it, and it seems to be working. It's big patch, but mostly there's just constructors removal. Actual changes are in: QueriesCommandBase CommandsFactory RegisterVdsQuery GetAllTemplateBasedEntityQuery GetAllInstanceTypesQuery GetAllVmTemplatesQuery GetAllImageTypesQuery and test files.