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java.sql.SQLRecoverableException: Io exception: Socket closed	at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:101)	at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:199)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:263)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:521)	at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1024)	at oracle.jdbc.driver.OracleResultSetImpl.close_or_fetch_from_next(OracleResultSetImpl.java:314)	at oracle.jdbc.driver.OracleResultSetImpl.next(OracleResultSetImpl.java:228)	at oracle.jdbc.driver.ScrollableResultSet.cacheRowAt(ScrollableResultSet.java:1839)	at oracle.jdbc.driver.ScrollableResultSet.isValidRow(ScrollableResultSet.java:1823)	at oracle.jdbc.driver.ScrollableResultSet.isLast(ScrollableResultSet.java:349)	at undefined.JDBCInputFormat.reachedEnd(JDBCInputFormat.java:98)	at org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:173)	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)	at java.lang.Thread.run(Thread.java:745)