客戶給了幾臺虛擬機器，要求先安裝一臺tomcat部署個測試環境。既然是測試環境，就只需簡單安裝 jdk 和 tomcat，啟動tomcat能正常啟動。

然後，把專案war包扔到tomcat的webapps目錄下，再次啟動後，開始載入專案，不過馬上就開始報錯：

java.sql.SQLException: Io 異常: Connection reset
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335)
        at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:361)
        at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:442)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321)
        at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:68)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:87)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.acquireResource(C3P0PooledConnectionPool.java:83)
        at com.mchange.v2.resourcepool.BasicResourcePool.assimilateResource(BasicResourcePool.java:884)
        at com.mchange.v2.resourcepool.BasicResourcePool.acquireUntil(BasicResourcePool.java:601)
        at com.mchange.v2.resourcepool.BasicResourcePool.access$400(BasicResourcePool.java:31)
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1079)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:354)

遇到這種報錯，首先想得的是資料庫連線是不是配置錯誤，防火牆是不是關閉等等。。。一一檢查，都沒發現問題。

後來，無意識看了一下hosts檔案，發現內容如下：

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 panda1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
感覺這裡設定有點問題，按自己思路設定一下，然後重啟機器。再次啟動tomcat，則能正常啟動專案，不再報錯。

tomcat 啟動應用報錯：java.sql.SQLException: Io 異常: Connection reset

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