playframework - Trait Subtractable issue after upgrading from Scala 2.11.11 to Scala 2.12.3 -


i migrated scala play! application scala 2.11.11 scala 2.12.3

since then, obtain following error when compiling app:

type arguments [?,equals] not conform trait subtractable's type parameter bounds [a,+repr <: scala.collection.generic.subtractable[a,repr]] [error]       (req <- request.req.getrequestlist) { [error]                               ^ [error] 1 error found

for reason, scala 2.12 seems have problem iterating on java array.

the getrequestlist returns following object: array[req].

did encountered issue?

here part of code encountering issue:

  // sorting requests certificate authority   (req <- request.req.getrequestlist) {     // extracting key hash request     val keyhash = getkeyhash(req)     // extracting name hash request     val namehash = getnamehash(req)     // retrieving ca key hash or name hash     val ca = keyhash.flatmap(getcertificateauthorityfromkeyhash).map { ca =>       logger.debug(s"[${self.path.name}] - ca found based on issuer key hash ('${keyhash.getorelse("na").touppercase}') -> '${ca.name}'")       ca     } orelse namehash.flatmap(getcertificateauthorityfromnamehash).map { ca =>       logger.debug(s"[${self.path.name}] - ca found based on issuer name hash ('${namehash.getorelse("na").touppercase}') -> '${ca.name}'")       ca     } getorelse {       logger.debug(s"[${self.path.name}] - unable find ca based on issuer key hash ('${keyhash.getorelse("na").touppercase}') , name hash ('${namehash.getorelse("na").touppercase}'. discarding request unauthorized status)")       throw new unknowncertificateauthorityexception("certificateid not reference registered certificate authority")     }     if (reqsbyca.contains(ca.id.get)) {       reqsbyca(ca.id.get) += req     } else {       reqsbyca += (ca.id.get -> arraybuffer(req))     }   }

the request.re.getrequestlist returns array of org.bouncycastle.cert.ocsp.req (array[org.bouncycastle.cert.ocsp.req]).

after further investigation, problem coming line:

reqsbyca(ca.id.get) += req

i replaced by:

reqsbyca(ca.id.get).append(req)

which me strictly equivalent...

and compiles , run.

if explain why, appreciate.

anyway, problem solved.


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