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via Stack Overflow by Derek A.
, 1 year ago
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 5,006 milliseconds ago. The last packet sent successfully to the server was 5,001 milliseconds ago.
via GitHub by schmitzhermes
, 6 months ago
java.lang.RuntimeException: Failed to invoke java.time.ZoneId() with no args
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 5,006 milliseconds ago.  The last packet sent successfully to the server was 5,001 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:526)	at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:142)	at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:150)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981)	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3465)	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3365)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3805)	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)	at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962)	at com.mysql.jdbc.CallableStatement.executeQuery(CallableStatement.java:858)