報錯內容:

The last packet successfully received from the server was 3,087,649 milliseconds ago.  The last packet sent successfully to the server was 1 milliseconds ago.
at sun.reflect.GeneratedConstructorAccessor50.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3697)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3586)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4131)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2597)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2758)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2826)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1302)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2929)
at com.alibaba.druid.filter.FilterAdapter.preparedStatement_execute(FilterAdapter.java:1058)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2927)
at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:118)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:493)
at sun.reflect.GeneratedMethodAccessor161.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:55)
at com.sun.proxy.$Proxy20.execute(Unknown Source)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:56)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:70)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:57)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
at sun.reflect.GeneratedMethodAccessor158.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:46)
at com.dpay.pay.common.core.mybatis.interceptor.ExecutorInterceptor.intercept(ExecutorInterceptor.java:47)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:57)
at com.sun.proxy.$Proxy18.query(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)
at sun.reflect.GeneratedMethodAccessor172.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354)
... 32 more
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3143)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3597)
... 68 more

錯誤分析:

     資料庫連線已經關閉或者失效後仍然在執行操作,導致:mysql服務沒返回資料 

     1.客戶端連線池中連線，已經失效；但是：連線池還沒有檢測到；當操作資料庫時，啟用該連線，丟擲該錯誤

     2.mysql伺服器，已關閉該連線，但：客戶端連線池中該連線，尚未檢測到。當用該連線操作資料庫時，丟擲該錯。

處理辦法：

     1.每次連線操作資料庫時，檢測：該連線的有效性

<property name=”minEvictableIdleTimeMillis” value=”1800000″ /> <property name=”numTestsPerEvictionRun” value=”3″ /> <property name=”testOnBorrow” value=”true” /> <property name=”testWhileIdle” value=”true” /> <property name=”testOnReturn” value=”true” /> <property name=”validationQuery” value=”SELECT 1″ />

     2.縮短監控空閒執行緒的時間。