postgresql Logical Replication Stream fails with Connection/Socket errors consistently

Hi

I am reading from logical replication stream continuously in infinite while
loop. and I have another program that is continuously populating a table in
the same database. I notice that after some time (around 5-10 minutes). I
always get the exception

org.postgresql.util.PSQLException: Database connection failed when
reading from copy
at org.postgresql.core.v3.QueryExecutorImpl.readFromCopy(QueryExecutorImpl.java:1035)
at org.postgresql.core.v3.CopyDualImpl.readFromCopy(CopyDualImpl.java:41)
at org.postgresql.core.v3.replication.V3PGReplicationStream.receiveNextData(V3PGReplicationStream.java:155)
at org.postgresql.core.v3.replication.V3PGReplicationStream.readInternal(V3PGReplicationStream.java:124)
at org.postgresql.core.v3.replication.V3PGReplicationStream.read(V3PGReplicationStream.java:70)
at com.datamirror.ts.scrapers.postgresqlscraper.PGStreamReceiver.main(PGStreamReceiver.java:60)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:220)
at java.net.SocketInputStream.read(SocketInputStream.java:152)
at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:140)
at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:109)
at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:67)
at org.postgresql.core.PGStream.receiveChar(PGStream.java:293)
at org.postgresql.core.v3.QueryExecutorImpl.processCopyResults(QueryExecutorImpl.java:1077)
at org.postgresql.core.v3.QueryExecutorImpl.readFromCopy(QueryExecutorImpl.java:1033)

Here are the sample error message(s) seen in the postgresql database
log during these times :

1) 2018-09-11 13:12:15.097 IST [7148] LOG: unexpected EOF on standby connection
2) 2018-09-11 12:54:01.435 IST [7086] LOG: could not send data to
client: Broken pipe
3) 2018-09-10 14:43:12.543 EDT [14880] LOG: unexpected EOF on standby
connection
2018-09-10 14:43:12.562 EDT [3180] LOG: could not receive data from
client: An existing connection was forcibly closed by the remote host.

Please note that :

1) my Postgresql database and Java program is on the same machine.

2) There is no firewall.

3) I have tried Postgres version 10 and 9.6

4) I have tried different version of driver as well.

5) The issue is more frequent when data traffic is very high in the stream.

6) my wal_sender_timeout is set to 60 seconds.

7) I have tried Windows/Linux and Mac operating systems.
Here is my sample program :

import java.nio.ByteBuffer;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

import org.postgresql.PGConnection;
import org.postgresql.PGProperty;
import org.postgresql.replication.LogSequenceNumber;
import org.postgresql.replication.PGReplicationStream;

public class PGStreamReceiver {
public static void main(String[] args) {
try {
LogSequenceNumber startLsn = LogSequenceNumber.valueOf("0/2D8D0F0");
String url = "jdbc:postgresql://localhost:5432/postgres"
;
String user ="postgres";
String password = "xxxx";
Properties connectionProperties = new Properties();

PGProperty.USER.set(connectionProperties, user);
PGProperty.PASSWORD.set(connectionProperties, password);
PGProperty.ASSUME_MIN_SERVER_VERSION.set(connectionProperties,
PostgreSQLConstants.MINIMUM_SUPPORTED_POSTGRESQL_VERSION);
PGProperty.REPLICATION.set(connectionProperties,
PostgreSQLConstants.POSTGRESQL_REPLICATION_PROPERTY_VALUE);
PGProperty.PREFER_QUERY_MODE.set(connectionProperties,
PostgreSQLConstants.POSTGRESQL_REPLICATION_PREFERRED_QUERY_MODE);
Connection postgresSQLConnection =
DriverManager.getConnection(url, connectionProperties);
PGConnection postgrePGConnectionWrapper =
postgresSQLConnection.unwrap(PGConnection.class);
PGReplicationStream stream = postgrePGConnectionWrapper.
getReplicationAPI()
.replicationStream()
.logical()
.withSlotName("pvn")
.withStartPosition(startLsn)

.withSlotOption(PostgreSQLConstants.INCLUDE_XID_IN_STREAM_CHANGES,
true)

.withSlotOption(PostgreSQLConstants.INCLUDE_TIMESTAMP_IN_STREAM_CHANGES,
true)

.withSlotOption(PostgreSQLConstants.EXCLUDE_EMPTY_TRANSACTION_IN_CHANGES,
true)

//.withStatusInterval(PostgreSQLConstants.SERVER_FEEDBACK_TIME_INTERVAL_IN_SECONDS,
TimeUnit.SECONDS)
.withStatusInterval(60, TimeUnit.SECONDS)
.start();
while(true)
{
ByteBuffer msg = stream.read();
if(msg == null)
{
return;
}
int offset = msg.arrayOffset();
byte[] source = msg.array();
int length = source.length - offset;
String logData = new String(source, offset, length);
System.out.print("1");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

Any help is appreciated !! I am using postgres JDBC driver 42.2.2.
Reference:
https://stackoverflow.com/questions/52147844/postgresql-logical-replication-stream-fails-with-database-connection-failed-whe

Regards
Shailesh