I've upgraded the ["org.mariadb.jdbc" % "mariadb-java-client"](http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.mariadb.jdbc%22%20AND%20a%3A%22mariadb-java-client%22) connector from 1.5.9 to 1.6.0 and I'd started to fail while connecting to the DB due to timeout exceptions.

I'm using it with HikariCP 2.5.1 and Slick 3.2.0. If I rollback the change again to MariaDB connector 1.5.9 it successfully connects, and if I try to upgrade directly to 2.0.1, it fails with the very same error.

The thing is that based on [the 1.6.0 changelog](https://mariadb.com/kb/en/mariadb/mariadb-connector-j-160-changelog/), we shouldn't experiment any breaking change. But according to [the differences in the GitHub repository](https://github.com/MariaDB/mariadb-connector-j/compare/1.5.9...1.6.0), it could have some more modifications than the ones specified in the changelog :/

Exception with a local DB:

```
java.sql.SQLTransientConnectionException: xxx.db - Connection is not available, request timed out after 5006ms.
at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:548)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:186)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:145)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:83)
at slick.jdbc.hikaricp.HikariCPJdbcDataSource.createConnection(HikariCPJdbcDataSource.scala:18)
at slick.jdbc.JdbcBackend$BaseSession.<init>(JdbcBackend.scala:439)
at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:47)
at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:38)
at slick.basic.BasicBackend$DatabaseDef$class.acquireSession(BasicBackend.scala:218)
at slick.jdbc.JdbcBackend$DatabaseDef.acquireSession(JdbcBackend.scala:38)
at slick.basic.BasicBackend$DatabaseDef$$anon$2.run(BasicBackend.scala:239)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLNonTransientConnectionException: Could not connect to address=(host=localhost)(port=3306)(type=master) : Connection refused
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get(ExceptionMapper.java:156)
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException(ExceptionMapper.java:118)
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.throwException(ExceptionMapper.java:92)
at org.mariadb.jdbc.Driver.connect(Driver.java:108)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:95)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:101)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:341)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:193)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:430)
at com.zaxxer.hikari.pool.HikariPool.access$500(HikariPool.java:64)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:570)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:563)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 common frames omitted
Caused by: java.sql.SQLException: Could not connect to address=(host=localhost)(port=3306)(type=master) : Connection refused
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1020)
at org.mariadb.jdbc.internal.util.Utils.retrieveProxy(Utils.java:481)
at org.mariadb.jdbc.Driver.connect(Driver.java:103)
... 12 common frames omitted
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connect(AbstractConnectProtocol.java:392)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1013)
... 14 common frames omitted

```

Exception with a remote DB:

```
java.sql.SQLTransientConnectionException: xxx.db - Connection is not available, request timed out after 5003ms.
    at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:548)
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:186)
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:145)
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:83)
    at slick.jdbc.hikaricp.HikariCPJdbcDataSource.createConnection(HikariCPJdbcDataSource.scala:18)
    at slick.jdbc.JdbcBackend$BaseSession.<init>(JdbcBackend.scala:439)
    at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:47)
    at slick.jdbc.JdbcBackend$DatabaseDef.createSession(JdbcBackend.scala:38)
    at slick.basic.BasicBackend$DatabaseDef$class.acquireSession(BasicBackend.scala:218)
    at slick.jdbc.JdbcBackend$DatabaseDef.acquireSession(JdbcBackend.scala:38)
    at slick.basic.BasicBackend$DatabaseDef$$anon$2.run(BasicBackend.scala:239)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

```