今日无意中用java连接oracle时，竟出现以下异常，甚是奇怪：
Caused by: java.sql.SQLException: Io 异常: Got minus one from a read call
 at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
 at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
 at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:333)
 at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:404)
 at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468)
 at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)
 at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)
 at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)
 at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877)
 at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)
.....
经检查，原来是连接端口配置错误，奇怪的是为什么不是 Io 异常: The Network Adapter could not establish the connection呢,用端口1433会出现该现象。