# Liquibase not working with mysql in osx **URL:** \ **Category:** General Discussion\ **Created:** [January 23, 2011, 10:42pm UTC](https://forum.liquibase.org/t/liquibase-not-working-with-mysql-in-osx/1084 "2011-01-23T22:42:00Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![stefanvaduva](https://avatars.discourse-cdn.com/v4/letter/s/a587f6/32.png) [@stefanvaduva](https://forum.liquibase.org/u/stefanvaduva)\ **Post date:** [January 23, 2011, 10:42pm UTC](https://forum.liquibase.org/t/liquibase-not-working-with-mysql-in-osx/1084/1 "2011-01-23T22:42:00Z")
Hello, I’m trying to use Liquibase in OSX (10.6) and I can’t make it talk with MySQL. java -jar liquibase.jar --driver=com.mysql.jdbc.Driver --url=jdbc:mysql://root@127.0.0.1:3306/mysql2 diff --referenceUrl=jdbc:mysql://root@127.0.0.1:3306/mysql3 returns Liquibase Update Failed: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. SEVERE 1/23/11 10:37 PM:liquibase: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. liquibase.exception.DatabaseException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at liquibase.integration.commandline.CommandLineUtils.createDatabaseObject(CommandLineUtils.java:88) at liquibase.integration.commandline.Main.doMigration(Main.java:613) at liquibase.integration.commandline.Main.main(Main.java:115) Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116) at com.mysql.jdbc.MysqlIO.(MysqlIO.java:343) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2334) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2371) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2163) at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:794) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305) at liquibase.integration.commandline.CommandLineUtils.createDatabaseObject(CommandLineUtils.java:79) … 2 more Caused by: java.net.UnknownHostException: [root@127.0.0.1](mailto:root@127.0.0.1) at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:850) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1201) at java.net.InetAddress.getAllByName0(InetAddress.java:1154) at java.net.InetAddress.getAllByName(InetAddress.java:1084) at java.net.InetAddress.getAllByName(InetAddress.java:1020) at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:244) at com.mysql.jdbc.MysqlIO.(MysqlIO.java:292) … 15 more I think that the JDBC driver is the main problem here, but I don’t know how to solve it. Does anyone managed to use diff on OSX wth MySQL? Thanks! ---
**Author:** ![nvoxland](https://avatars.discourse-cdn.com/v4/letter/n/87869e/32.png) [@nvoxland](https://forum.liquibase.org/u/nvoxland)\ **Post date:** [January 23, 2011, 10:42pm UTC](https://forum.liquibase.org/t/liquibase-not-working-with-mysql-in-osx/1084/2 "2011-01-23T22:42:00Z")
I think your root@ JDBC syntax is not right.  I haven’t looked at the mysql JDBC uri format a lot, but I don’t think you can specify the username in there.  I think you need to specify url=jdbc:mysql://127.0.0.1:3306/mysql2 --username=root ---
**Author:** ![stefanvaduva](https://avatars.discourse-cdn.com/v4/letter/s/a587f6/32.png) [@stefanvaduva](https://forum.liquibase.org/u/stefanvaduva)\ **Post date:** [January 23, 2011, 10:42pm UTC](https://forum.liquibase.org/t/liquibase-not-working-with-mysql-in-osx/1084/3 "2011-01-23T22:42:00Z")
Thanks Nathan! It worked with --username and --referenceUsername ---
**Author:** ![canlady](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@canlady](https://forum.liquibase.org/u/canlady)\ **Post date:** [January 23, 2011, 10:42pm UTC](https://forum.liquibase.org/t/liquibase-not-working-with-mysql-in-osx/1084/4 "2011-01-23T22:42:00Z")
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