如何验证Slick是否正在使用application.conf中的参数？

Question

In application.conf, parameters are set:

  url = "jdbc:mysql://.../table_name"
  user = ...
  password = ...
  driver = "com.mysql.jdbc.Driver"
  connectionPool = HikariCP
  queueSize = 25000

I am still receiving an error whenever the queue reaches 1000 items, meaning that the queueSize property is still the default value.

Task scala.slick.backend.DatabaseComponent$DatabaseDef$... 
rejected from java.util.concurrent.ThreadPoolExecutor...
[Running, pool size = 20, 
active threads = 20, 
queued tasks = 1000, 
completed tasks = 7507]

Answer 1

Not sure why it's not picking up your value, but you might want to try a different way of configuring.. you didn't say what version of Slick you are using. But please refer to the Slick 3.0.0 documentation . Try it using TypeSafe Config :

In your application.conf :

database {
  dataSourceClass = "org.postgresql.ds.PGSimpleDataSource" // replace with mysql driver
  properties = {
    databaseName = "mydb"
    user = "myuser"
    password = "secret"
  }
  queueSize = 25000 // I've never changed that property, so not tested.
}

Then in scala:

val db = Database.forConfig("database")

Hope this works for you.