The exception contained within MappableContainerException
Looks like you are missing something on the classpath. The exception you need to fix is the NoClassDefFoundException from TenantConfigDB.getAllHotwords(). MappableContainerException is just a wrapper exception that Jersey uses if the underlying code threw something that is not mappable to a response (in this case it is the NoClassDefFoundException). Seems some dependency of DBManager class cannot be loaded as it is not on the classpath.