OpenMRS is not able to start.
The following error occurred at startup:
Error occurred while trying to get the updates needed for the database. Unable to get a connection to the database. Please check your openmrs runtime properties file and make sure you have the correct connection.username and connection.password set
java.lang.RuntimeException: Error occurred while trying to get the updates needed for the database. Unable to get a connection to the database.  Please check your openmrs runtime properties file and make sure you have the correct connection.username and connection.password set
	at org.openmrs.util.DatabaseUpdater.getUnrunDatabaseChanges(DatabaseUpdater.java:627)
	at org.openmrs.util.DatabaseUpdater.getUnrunDatabaseChanges(DatabaseUpdater.java:583)
	at org.openmrs.util.DatabaseUpdater.updatesRequired(DatabaseUpdater.java:249)
	at org.openmrs.web.Listener.setupNeeded(Listener.java:222)
	at org.openmrs.web.Listener.contextInitialized(Listener.java:180)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5197)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5720)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1018)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:994)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)
	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2020)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.Exception: Unable to get a connection to the database.  Please check your openmrs runtime properties file and make sure you have the correct connection.username and connection.password set
	at org.openmrs.util.DatabaseUpdater.getLiquibase(DatabaseUpdater.java:358)
	at org.openmrs.util.DatabaseUpdater.getUnrunDatabaseChanges(DatabaseUpdater.java:612)
	... 17 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.Util.getInstance(Util.java:386)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
	at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2395)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2316)
	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:834)
	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
	at java.sql.DriverManager.getConnection(DriverManager.java:664)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at org.openmrs.util.DatabaseUpdater.getConnection(DatabaseUpdater.java:420)
	at org.openmrs.util.DatabaseUpdater.getLiquibase(DatabaseUpdater.java:355)
	... 18 more
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:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1129)
	at com.mysql.jdbc.MysqlIO.(MysqlIO.java:358)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2489)
	at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2334)
	... 32 more
Caused by: java.net.UnknownHostException: openmrs-referenceapplication-mysql
	at java.net.InetAddress.getAllByName0(InetAddress.java:1281)
	at java.net.InetAddress.getAllByName(InetAddress.java:1193)
	at java.net.InetAddress.getAllByName(InetAddress.java:1127)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:248)
	at com.mysql.jdbc.MysqlIO.(MysqlIO.java:308)
	... 34 more


See the server log for full output.