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:628)
	at org.openmrs.util.DatabaseUpdater.getUnrunDatabaseChanges(DatabaseUpdater.java:584)
	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:4961)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5455)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	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:613)
	... 13 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)
	... 14 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)
	... 28 more
Caused by: java.net.ConnectException: Connection refused (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 java.net.Socket.(Socket.java:434)
	at java.net.Socket.(Socket.java:244)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
	at com.mysql.management.driverlaunched.ServerLauncherSocketFactory.connect(ServerLauncherSocketFactory.java:74)
	at com.mysql.jdbc.MysqlIO.(MysqlIO.java:308)
	... 30 more


See the server log for full output.