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:578)
	at org.openmrs.util.DatabaseUpdater.updatesRequired(DatabaseUpdater.java:257)
	at org.openmrs.web.Listener.setupNeeded(Listener.java:170)
	at org.openmrs.web.Listener.contextInitialized(Listener.java:142)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4276)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4779)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:803)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:780)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:583)
	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:676)
	at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:602)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:503)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:325)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1069)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
	at org.apache.catalina.core.StandardService.start(StandardService.java:525)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:761)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:607)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
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:337)
	at org.openmrs.util.DatabaseUpdater.getUnrunDatabaseChanges(DatabaseUpdater.java:564)
	... 27 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:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:527)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
	at com.mysql.jdbc.Util.getInstance(Util.java:381)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2364)
	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:773)
	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:527)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
	at java.sql.DriverManager.getConnection(DriverManager.java:571)
	at java.sql.DriverManager.getConnection(DriverManager.java:215)
	at org.openmrs.util.DatabaseUpdater.getConnection(DatabaseUpdater.java:394)
	at org.openmrs.util.DatabaseUpdater.getLiquibase(DatabaseUpdater.java:334)
	... 28 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,751,344,679,537 milliseconds ago.  The last packet sent successfully to the server was 0 milliseconds ago.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:527)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
	at com.mysql.jdbc.MysqlIO.(MysqlIO.java:341)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2288)
	... 41 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:598)
	at java.net.Socket.connect(Socket.java:547)
	at java.net.Socket.(Socket.java:447)
	at java.net.Socket.(Socket.java:260)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
	at com.mysql.jdbc.MysqlIO.(MysqlIO.java:290)
	... 42 more

See the server log for full output.