Completely new to Cassandra. Tried to initialize a database in Cassandra using phantom-dsl. I received this error message.
*** RUN ABORTED ***
java.lang.AssertionError: assertion failed: no symbol could be loaded from class com.datastax.driver.core.Cluster in package core with name Cluster and classloader sun.misc.Launcher$AppClassLoader#279f2327
at scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$JavaMirror$$classToScala1(JavaMirrors.scala:1021)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:980)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:980)
at scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$toScala$1.apply(JavaMirrors.scala:97)
at scala.reflect.runtime.TwoWayCaches$TwoWayCache$$anonfun$toScala$1.apply(TwoWayCaches.scala:39)
at scala.reflect.runtime.Gil$class.gilSynchronized(Gil.scala:19)
at scala.reflect.runtime.JavaUniverse.gilSynchronized(JavaUniverse.scala:16)
at scala.reflect.runtime.TwoWayCaches$TwoWayCache.toScala(TwoWayCaches.scala:34)
at scala.reflect.runtime.JavaMirrors$JavaMirror.toScala(JavaMirrors.scala:95)
at scala.reflect.runtime.JavaMirrors$JavaMirror.classToScala(JavaMirrors.scala:980)
I am not really sure whether it is an issue with the Connector in phantom-dsl or the ClusterBuilder in datastax-driver.
Connector.scala
package com.neruti.db
import com.neruti.db.models._
import com.websudos.phantom.database.Database
import com.websudos.phantom.connectors.ContactPoints
import com.websudos.phantom.dsl.KeySpaceDef
object Connector {
val host= Seq("localhost")
val port = 9160
val keySpace: String = "nrt_entities"
// val inet = InetAddress.getByName
lazy val connector = ContactPoints(host,port).withClusterBuilder(
_.withCredentials("cassandra", "cassandra")
).keySpace(keySpace)
}
CassandraSpec.scala
package com.neruti.db
import com.neruti.User
import com.neruti.db.models._
import com.neruti.db.databases._
import com.neruti.db.services._
import com.neruti.db.Connector._
import java.util.UUID
import com.datastax.driver.core.ResultSet
import org.scalatest._
import org.scalatest.{BeforeAndAfterAll,FlatSpec,Matchers,ShouldMatchers}
import org.scalatest.concurrent.ScalaFutures
import org.scalamock.scalatest.MockFactory
import scala.concurrent.duration._
import scala.concurrent.{Await, Future}
import scala.concurrent.ExecutionContext.Implicits.global
abstract class BaseCassandraSpec extends FlatSpec
with BeforeAndAfterAll
with Inspectors
with Matchers
with OptionValues
with ScalaFutures
class CassandraTest extends BaseCassandraSpec
with ProductionDatabase
with UserService
with Connector.connector.Connector{
val user = User(
Some("foobar"),
Some("foo#foobar.com"),
Some(UUID.randomUUID()),
)
override protected def beforeAll(): Unit = {
Await.result(database.userModel.create(user),10.seconds)
}
}
Looks there may be multiple issues you are looking at:
The latest version of phantom is 2.1.3, I'd strongly recommend using that, especially if you are just starting out. The migration guide is here in case you need it.
The entire reflection mechanism has been replaced in the latest version, so that error should magically go away. With respect to testing and generating objects, I would also look to include com.outworkers.util.testing, which is freely available on Maven Central
libraryDependencies ++= Seq(
//..,
"com.outworkers" %% "phantom-dsl" % "2.1.3",
"com.outworkers" %% "util-testing" % "0.30.1" % Test
)
This will offer you automated case class generation:
import com.outworkers.util.testing._
val sample = gen[User]
Related
My project was recently updated from Play 2.5 to 2.6.13.
I added a new script 16.sql but the change were not applied in the table play_evolutions
According to the documentation 2.6, the EvolutionsComponents have to be injected if you use compile time DI. But Guice is runtime DI, so I should not have to inject any components.
I enabled the evolutions in the build.sbt
libraryDependencies ++= Seq(evolutions, jdbc)
In application.conf
play.evolutions.enabled=true
play.evolutions.autoApply=true
What is my project missing ? Any git examples are welcome
I solved it by following the documentation since upgrading to Play 2.6
Here is my code
import play.api.ApplicationLoader.Context
import play.api.{Application, ApplicationLoader, BuiltInComponentsFromContext}
import play.api.db.{DBComponents, HikariCPComponents}
import play.api.db.evolutions.EvolutionsComponents
import play.api.routing.Router
import play.filters.HttpFiltersComponents
import router.Routes
class MyApplicationLoader extends ApplicationLoader {
def load(context: ApplicationLoader.Context): Application = {
new AppComponents(context).application
}
}
class AppComponents(context: Context)
extends BuiltInComponentsFromContext(context)
with DBComponents
with EvolutionsComponents
with HikariCPComponents
with HttpFiltersComponents {
// this will actually run the database migrations on startup
applicationEvolutions
// val prefix: String = "/"
lazy val router = Router.empty
// lazy val router: Router = bind(classOf[Routes]).to(classOf[Routes])
}
And in the conf/application.conf, add this line
play.application.loader=MyApplicationLoader
I am trying to write a simple Http client using Akka Http Client API. Towards this I have written the following code
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling._
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{Sink, Source}
import scala.concurrent.duration._
import scala.concurrent.{Await}
import akka.http.scaladsl.server.Directives
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import spray.json._
final case class Post(postId: Int, id: Int, name: String, email: String, body: String)
trait JsonSupport extends SprayJsonSupport with DefaultJsonProtocol {
implicit val postFormat = jsonFormat5(Post.apply)
}
class AkkaHttpClient extends App with Directives with JsonSupport {
implicit val system = ActorSystem("my-Actor")
implicit val actorMaterializer = ActorMaterializer()
implicit val executionContext = system.dispatcher
val httpClient = Http().outgoingConnection(host="http://jsonplaceholder.typicode.com/")
val flow = Source.single(HttpRequest(uri = Uri("/comments/1")))
.via(httpClient)
.mapAsync(1)(r => Unmarshal(r.entity).to[Post])
.runWith(Sink.head)
val results = Await.result(flow, 15 seconds)
println(results)
}
My build.sbt file looks like
name := "Akka-Http-Client"
version := "1.0"
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http-experimental" % "2.4.9-RC1",
"com.typesafe.akka" %% "akka-http-spray-json-experimental" % "2.4.9-RC1"
)
When I try to compile my code I get these errors
Error:scalac: missing or invalid dependency detected while loading class file 'Unmarshaller.class'.
Could not access type Unmarshaller in value akka.http.javadsl.unmarshalling,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'Unmarshaller.class' was compiled against an incompatible version of akka.http.javadsl.unmarshalling.
I am having the same problem on 2.4.9-RC1, falling back to 2.4.8 solves the problem.
OR you could use this workaround described here: https://github.com/akka/akka/issues/21105
I want to verify the order of sequence calls, but it didn't work as I expected.
import akka.actor.ActorSystem
import akka.testkit.TestKit
import org.scalatest._
import org.specs2.mock.Mockito
class Test extends TestKit(ActorSystem("testSystem"))
with WordSpecLike
with BeforeAndAfterAll
with PrivateMethodTester
with `enter code here`Mockito
{
val m = mock[java.util.List[String]]
m.get(0) returns "one"
there was two(m).get(2) //do not throw any error, why???
}
I'm using
scala 2.11.7,
specs2-core 3.6.6,
specs2-mock 3.6.6,
scalatest 2.2.4
thx
I don't think you can mix Specs2 and ScalaTest.
You shuld remove import org.scalatest._ and use import org.specs2.mutable.SpecificationLike instead.
import akka.testkit.TestKit
import akka.actor.ActorSystem
import org.specs2.mock.Mockito
import org.specs2.mutable.SpecificationLike
class Test extends TestKit(ActorSystem("testSystem"))
with Mockito
with SpecificationLike
{
"it" should{
"raise error" in {
val m = mock[java.util.List[String]]
m.get(0) returns "one"
there was two(m).get(2)
}
}
}
Now you can see that sbt test returns something like.
[error] The mock was not called as expected:
[error] Wanted but not invoked:
[error] list.get(2);
[error] -> at Test$$anonfun$1$$anonfun$apply$1$$anonfun$apply$3.apply(Test.scala:14)
[error] Actually, there were zero interactions with this mock. (Test.scala:14)
I am currently trying to set up a Play2 application with dependency injection, with information from the official docs. However, my IDE cannot find GuiceApplicationBuilder. So which additional entry for libraryDependencies do I have to specify to get this builder?
EDIT: I made a screenshot of what happens when I try to import the things stated by #anquegi
EDIT 2: The problem was very simple: I used the wrong version of Play - 2.3.8 did in fact not have these, I had to use 2.4.0-RC2 to get it to work.
At the dependencies in the play docs /ScalaDependencyInjection you must import this
import play.api.ApplicationLoader
import play.api.Configuration
import play.api.inject._
import play.api.inject.guice._
This is the compile code in the section Advanced: Extending the GuiceApplicationLoader, so you need to use this extending in your class:
import play.api.ApplicationLoader
import play.api.Configuration
import play.api.inject._
import play.api.inject.guice._
class CustomApplicationLoader extends GuiceApplicationLoader() {
override def builder(context: ApplicationLoader.Context): GuiceApplicationBuilder = {
val extra = Configuration("a" -> 1)
initialBuilder
.in(context.environment)
.loadConfig(extra ++ context.initialConfiguration)
.overrides(overrides(context): _*)
}
}
I'm new to Scala and Dispatch, and I can't seem to get a basic Post request working.
I'm actually building a sbt plugin that uploads files to a third party service.
Here is my build.sbt file:
sbtPlugin := true
name := "sbt-sweet-plugin"
organization := "com.mattwalters"
version := "0.0.1-SNAPSHOT"
libraryDependencies += "net.databinder.dispatch" %% "dispatch-core" % "0.11.0"
And here is the plugin's SweetPlugin.scala:
package com.mattwalters
import sbt._
import Keys._
import dispatch._
object SweetPlugin extends Plugin {
import SweetKeys._
object SweetKeys {
lazy val sweetApiToken =
SettingKey[String]("Required. Find yours at https://example.com/account/#api")
lazy val someOtherToken =
SettingKey[String]("Required. Find yours at https://example.com/some/other/token/")
lazy val sweetFile =
SettingKey[String]("Required. File data")
lazy val sweetotes =
SettingKey[String]("Required. Release notes")
lazy val sweetUpload =
TaskKey[Unit]("sweetUpload", "A task to upload the specified sweet file.")
}
override lazy val settings = Seq (
sweetNotes := "some default notes",
// define the upload task
sweetUpload <<= (
sweetApiToken,
someOtherToken,
sweetFile,
sweetNotes
) map { (
sweetApiToken,
someOtherToken,
sweetFile,
sweetNotes
) =>
// define http stuff here
val request = :/("www.example.com") / "some" / "random" / "endpoint"
val post = request.POST
post.addParameter("api_token", sweetApiToken)
post.addParameter("some_other_token", someOtherToken)
post.addParameter("file", io.Source.fromFile(sweetFile).mkString)
post.addParameter("notes", sweetNotes)
val responseFuture = Http(post OK as.String)
val response = responseFuture()
println(response) // see if we can get something at all....
}
)
}
The dispatch documentation shows:
import dispatch._, Defaults._
but I get
reference to Defaults is ambiguous;
[error] it is imported twice in the same scope by
removing , Defaults._ makes this error go away.
I also tried the recommendation from this post:
import dispatch._
Import dispatch.Default._
But alas I get:
object Default is not a member of package dispatch
[error] import dispatch.Default._
Also tried the advice from
Passing implicit ExecutionContext to contained objects/called methods:
import concurrent._
import concurrent.duration._
But I still get
Cannot find an implicit ExecutionContext, either require one yourself or import ExecutionContext.Implicits.global
Back to square one...
New to scala so any advice at all on the code above is appreciated.
Since the recommended sbt console run works fine, it looks like one of your other imports also has a Defaults module. It's a standard approach in Scala for collecting implicit values to be used as function params (another naming convention is Implicits).
The other problem is that there is a typo/out-of-date problem in the import statement you got from Google Groups - it's Defaults, plural.
In summary - the best solution is to explicitly let Scala know which module you want to use:
import dispatch._
import dispatch.Defaults._
In the general case, only if the library's docs don't say otherwise: the last error message is pretty common to concurrent programming in Scala. To quote the relevant part:
either require one yourself or import ExecutionContext.Implicits.global
So, unless you want to roll your own ExecutionContext, just import the scala.concurrent.ExecutionContext.Implicits.global one via the scala.concurrent.ExecutionContext.Implicits module.