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sample error

Caused by: com.mysql.cj.exceptions.ConnectionIsClosedException: No operations allowed after connection closed.
	at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:67)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:484)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:52)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:95)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:140)
	at com.mysql.cj.NativeSession.checkClosed(NativeSession.java:915)
	at com.mysql.cj.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:586)
	at com.mysql.cj.jdbc.ConnectionImpl.createStatement(ConnectionImpl.java)
	... 10 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet successfully received from the server was 20,096 milliseconds ago. The last packet sent successfully to the server was 20,102 milliseconds ago.
	at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:67)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:484)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:52)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:95)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:140)
	at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:156)
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:597)
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:775)
	at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:714)
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:946)
	at com.mysql.cj.NativeSession.execSQL(NativeSession.java:803)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1250)
	at com.orb.battambang/com.orb.battambang.util.MiniQueueManager.updateWaitingList(MiniQueueManager.java:42)
	at com.orb.battambang/com.orb.battambang.util.MiniQueueManager$1.lambda$run$0(MiniQueueManager.java:34)
	... 7 more
Caused by: java.net.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:315)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:340)
	at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:789)
	at java.base/java.net.Socket$SocketInputStream.read(Socket.java:1025)
	at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:483)
	at java.base/sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:477)
	at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(SSLSocketInputRecord.java:70)
	at java.base/sun.security.ssl.SSLSocketImpl.readApplicationRecord(SSLSocketImpl.java:1465)
	at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(SSLSocketImpl.java:1069)
	at java.base/java.io.FilterInputStream.read(FilterInputStream.java:119)
	at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:55)
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeaderLocal(SimplePacketReader.java:72)
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:54)
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:36)
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:43)
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:32)
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:45)
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:35)
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:591)
	... 14 more