Slick can't connect to mssql database - sql-server

Question

I would like to use Slick (3.2.3) to connect to a MSSQL database.
Currently, my project is the following.
In application.conf, I have
somedbname = {
driver = "slick.jdbc.SQLServerProfile$"
db {
host = "somehost"
port = "someport"
databaseName = "Recupel.Datawarehouse"
url = "jdbc:sqlserver://"${somedbname.db.host}":"${somedbname.db.port}";databaseName="${somedbname.db.databaseName}";"
user = "someuser"
password = "somepassword"
}
}
The "somehost" looks like XX.X.XX.XX where X's are numbers.
My build.sbt contains
name := "test-slick"
version := "0.1"
scalaVersion in ThisBuild := "2.12.7"
libraryDependencies ++= Seq(
"com.typesafe.slick" %% "slick" % "3.2.3",
"com.typesafe.slick" %% "slick-hikaricp" % "3.2.3",
"org.slf4j" % "slf4j-nop" % "1.6.4",
"com.microsoft.sqlserver" % "mssql-jdbc" % "7.0.0.jre10"
)
The file with the "main" object contains
import slick.basic.DatabaseConfig
import slick.jdbc.JdbcProfile
import slick.jdbc.SQLServerProfile.api._
import scala.concurrent.Await
import scala.concurrent.duration._
val dbConfig: DatabaseConfig[JdbcProfile] = DatabaseConfig.forConfig("somedbname")
val db: JdbcProfile#Backend#Database = dbConfig.db
def main(args: Array[String]): Unit = {
try {
val future = db.run(sql"SELECT * FROM somettable".as[(Int, String, String, String, String,
String, String, String, String, String, String, String)])
println(Await.result(future, 10.seconds))
} finally {
db.close()
}
}
}
This, according to all the documentation that I could find, should be enough to connect to the database. However, when I run this, I get
[error] (run-main-0) java.sql.SQLTransientConnectionException: somedbname.db - Connection is not available, request timed out after 1004ms.
[error] java.sql.SQLTransientConnectionException: somedbname.db - Connection is not available, request timed out after 1004ms.
[error] at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:548)
[error] at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:186)
[error] at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:145)
[error] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:83)
[error] at slick.jdbc.hikaricp.HikariCPJdbcDataSource.createConnection(HikariCPJdbcDataSource.scala:14)
[error] at slick.jdbc.JdbcBackend$BaseSession.<init>(JdbcBackend.scala:453)
[error] at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:46)
[error] at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:37)
[error] at slick.basic.BasicBackend$DatabaseDef.acquireSession(BasicBackend.scala:249)
[error] at slick.basic.BasicBackend$DatabaseDef.acquireSession$(BasicBackend.scala:248)
[error] at slick.jdbc.JdbcBackend$DatabaseDef.acquireSession(JdbcBackend.scala:37)
[error] at slick.basic.BasicBackend$DatabaseDef$$anon$2.run(BasicBackend.scala:274)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[error] at java.base/java.lang.Thread.run(Thread.java:844)
[error] Nonzero exit code: 1
Perhaps related and also annoying, when I run this code for the second (and subsequent) times, I get the following error instead:
Failed to get driver instance for jdbcUrl=jdbc:sqlserver://[...]
which forces me to kill and reload sbt each time.
What am I doing wrong? Worth noting: I can connect to the database with the same credential from a software like valentina.

Answer 1

As suggested by #MarkRotteveel, and following this link, I found a solution.
First, I explicitly set the driver, adding the line
driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"
in the db dictionary, after password = "somepassword".
Secondly, the default timeout (after one second) appears to be too short for my purposes, and therefore I added the line
connectionTimeout = "30 seconds"
after the previous driver line, still in the db dictionary.
Now it works.