docker - SBT tests running really slow on CI server -

i have ci pipeline setup on bitbucket , runs

sbt "project api" "testonly core.entities.userspec" 

it runs smoothly on laptop , took 2s. when try run on ci server, took 4min run half of test.

userspec written in spec2 , not have database or heavy computation. here of tests like:

def addcredential_nonconfirmedemail_notallowed = {     val emailaddress: emailaddress = fixture.emailaddress("unconfirmed")     val user: user = fixture.user().copy(emailaddresses = set(emailaddress))     val result = user.addcredential(emailaddress, fixture.password())      val exception = result.failed.get.asinstanceof[domainexception]     exception.code mustequal domainexceptiontype.validation     exception.message mustequal "email address must confirmed before can used part of credential" } 

the ci runs on docker using "bigtruedata/sbt:0.13.15-2.11.11" image. hitting head wall 2 days trying solve problem. first, blamed ci , try out :

• gitlab ci
• wercker

and still no luck.

could please me out this? how sbt settings looks like

val projectsettings = seq( version := "1.0-snapshot", scalaversion := "2.11.11", resolvers ++= dependencies.resolvers, fork in test := false, parallelexecution in test := false) 

finally, found culprit! me, not ci, docker or sbt.

i have fixture.password() method in test uses securerandom.getinstancestrong in val salt = bcrypt.gensalt(10, securerandom.getinstancestrong). block thread if there not enough randomness according this reference. once removed securerandom.getinstancestrong, working usual now.

i should have learnt different between random , securerandom before using , wasted 3 days due this. learning hard way :-d