Slick 3.0 with default connection pool and postgresql 9.4.4 with too many clients error

I am currently building a microservices application. I have three instances that actually interact with the database, i.e. Postgresql 9.4.4.

Below are my connection properties with Slide 3.0

dev {

# Development Database configuration
# ~~~~~
dbconf {
    dataSourceClass="org.postgresql.ds.PGSimpleDataSource"
    properties {
        user="xyz"
        password="dev@xyz"
        databaseName="dev_xyz"
        serverName="localhost"
    }
    numThreads=10
}
}

      

        
        
        
      

    

The problem is I am getting this FATAL: sorry too many clients are already wrong. max_connections in postgresql is 100, which is the default. As per the discussions on the internet, I might have to use a connection pool for this, which I do using HikariCP's default Slick connection pool. I'm just confused right now which step I should take to fix this problem.