| import play.api.libs.json.{Json, Format} | |
| // If you imported | |
| import play.modules.reactivemongo.json.BSONFormats.BSONObjectIDFormat | |
| // And still getting No implicit format for reactivemongo.bson.BSONObjectID available. error | |
| // Check that your JSON formatter is typed. Change | |
| implicit val mongoFormat = Json.format[Category] | |
| // to | |
| implicit val mongoFormat: Format[Category] = Json.format[Category] |
| /* @flow */ | |
| var a = { | |
| "a":"a", | |
| "b":"b" | |
| } | |
| var res = a.c; | |
| // $ flow simple.js | |
| // $ No errors! |
If you were playing with reactive-stream, and you got this error
scala> val sum = source.runWith(sink)
<console>:14: error: could not find implicit value for parameter materializer: akka.stream.FlowMaterializer
You need an implicit FlowMaterializer
def runWith[Mat2](sink: Graph[SinkShape[Out], Mat2])(implicit materializer: FlowMaterializer): Mat2
In playframework 2.4, if you get the error
object Application is not a member of package controllers
Note: class Application exists, but it has no companion object.
It's because the class is not instantiated. You need to add
routesGenerator := InjectedRoutesGenerator
| The default utf8 character set doesn't support emoji characters, you'll see `[SQLException: Incorrect string value: '\xF0\x9F\x98\x8A P...' for ` exception when trying to insert data. | |
| You'll need utf8mb4 character set to be able to sotre emoji characters. | |
| 1. You'll need to create all the tables with CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci option | |
| 2. After initializing the conneciton, you will need to send SET NAMES utf8mb4, | |
| you can do that with the hikari connectionInitSql option, a SQL statement that will be executed after the connetion was initialized. | |
| slick.dbs.default.db.connectionInitSql="set names utf8mb4" |
| #!/bin/sh | |
| export PYSPARK_DRIVER_PYTHON="/usr/local/bin/jupyter" | |
| export PYSPARK_DRIVER_PYTHON_OPTS="notebook --NotebookApp.open_browser=False --NotebookApp.ip='*' --NotebookApp.port=8880" | |
| export PYSPARK_PYTHON="/usr/bin/python" | |
| pyspark |
Scala code run from Intellij Worksheet doesn't seem to be able to find the akka actor resources.
The error is:
com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'akka'
There is an opened ticket on Intellij bugtracker https://youtrack.jetbrains.com/issue/SCL-9229 with a work arround
| #!/usr/bin/env amm | |
| import $ivy.`com.typesafe.akka::akka-stream:2.4.16` | |
| import java.nio.file.Paths | |
| import akka.NotUsed | |
| import akka.stream._ | |
| import akka.stream.scaladsl._ | |
| import akka.actor.ActorSystem | |
| import akka.util.ByteString |
| // Multistep encoding of ascii to binary->base64 | |
| // As the binary will be presented as blocks of 0,1 separated by space. | |
| // The base64 result will contain patterns such as MTA, MCA, IDE. | |
| val message = "Hello World !" | |
| def encode(message: String): String = | |
| java.util.Base64.getEncoder().encodeToString( message.map(_.toBinaryString).mkString(" ").map(_.toByte).toArray ) | |
| def decode(base64: String): String = |