String url = "jdbc:postgresql://localhost:5432/sampledb?characterEncoding=utf8";
Properties props = new Properties();
PGProperty.USER.set(props, "postgres");
PGProperty.PASSWORD.set(props, "root");
PGProperty.ASSUME_MIN_SERVER_VERSION.set(props, "9.6");
PGProperty.REPLICATION.set(props, "true");
PGProperty.PREFER_QUERY_MODE.set(props, "simple");
DriverManager.registerDriver(new org.postgresql.Driver());
Connection con = DriverManager.getConnection(url, props);
PGConnection replConnection = con.unwrap(PGConnection.class);

replConnection.getReplicationAPI()
.createReplicationSlot()
.logical()
.withSlotName("logical_replication_slot")
.withOutputPlugin("test_decoding")
.make();

Caused by: org.postgresql.util.PSQLException: ERROR: invalid byte sequence for encoding "UTF8": 0xe9 0x71 0x75
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2125)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:297)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:428)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:354)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:301)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:287)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:264)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:260)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at org.postgresql.replication.fluent.logical.LogicalCreateSlotBuilder.make(LogicalCreateSlotBuilder.java:48)[423:org.postgresql.jdbc41:42.0.0.jre7]
        at com.soprahr.hub.replication.postgresql.activator.Activator.start(Activator.java:41)[424:com.soprahr.hub.replication.postgresql:0.0.1.SNAPSHOT]
        at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)[org.apache.felix.framework-5.6.1.jar:]
        at org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)[org.apache.felix.framework-5.6.1.jar:]
        ... 16 more

client_encoding = windows-1251      # actually, defaults to database
                    # encoding

# These settings are initialized by initdb, but they can be changed.
lc_messages = 'French_France.1252'          # locale for system error message
                    # strings
lc_monetary = 'French_France.1252'          # locale for monetary formatting
lc_numeric = 'French_France.1252'           # locale for number formatting
lc_time = 'French_France.1252'              # locale for time formatting