报错

钟新

有时候登录会有这个报错，这是jdbc的连接断了吗？为什么？

Caused by: com.justep.exception.BusinessException: 编码: JUSTEP150039; 提示: 执行sql: SELECT  t_user.NAME AS name, t_user.fID AS t_user, t_user.USER_DESC AS user_desc FROM T_USER t_user, binds: []出错
        at com.justep.exception.BusinessException.create(Unknown Source)
        at com.justep.system.ksql.KSQLUtils.execSqlSelect(Unknown Source)
        ... 34 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 54,674,870 milliseconds ago.  The last packet sent successfully to the server was 1 milliseconds ago.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)        at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:400)        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3434)        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3334)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3774)        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2447)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2594)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545)        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1901)        at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2002)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)        ... 35 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:2926)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3344)
        ... 44 more

jishuang

http://docs.wex5.com/bex5-deploy-question-list-4011/

钟新

改配置文件后还是报错，是因为这个改动也需要改版本号吗？

jishuang

修改后重启tomcat，tomcat的配置文件修改跟版本号无关

钟新

重启了啊， 和select 前面那空格有关系吗？validationQuery=" select current_time"

jishuang

http://bbs.wex5.com/forum.php?mo ... 1&pid=165545678