解决mysql连接异常—-com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception

      前两天机房搬迁,DNS域名切换,导致出现如下异常。经查原因发现,是连接池中的连接在应用端空闲,但该连接的vip(服务器集群地址)已经超时(超时时间是60s,而应用端的连接回收时间是180s),所以当再次使用该连接时会出现连接失效的异常。解决办法是将vip的超时时间调大,改成300s,这样就能保证连接池中的等待连接不会因为vip的超时而失效。

异常如下:

org.springframework.dao.DataAccessResourceFailureException: SqlMapClient operation; SQL [];
— The error occurred in sqlmap/mysql/sqlmap-enquiries.xml.
— The error occurred while applying a parameter map.
— Check the enquiries.getEnquiriesByEnquiriesId-InlineParameterMap.
— Check the statement (query failed).
— Cause: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: Broken pipe

STACKTRACE:

java.net.SocketException: Broken pipe
        at java.net.SocketOutputStream.socketWrite0(Native Method)
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
        at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2637)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1554)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
        at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
        at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:794)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:169)
        at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:186)
        at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery(GeneralStatement.java:205)
        at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173)
        at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:104)
        at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:566)
        at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:541)
        at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106)
        at org.springframework.orm.ibatis.SqlMapClientTemplate$1.doInSqlMapClient(SqlMapClientTemplate.java:273)
        at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:209)
        at org.springframework.orm.ibatis.SqlMapClientTemplate.queryForObject(SqlMapClientTemplate.java:271)

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