mysql连接出现的奇怪的问题
安裝在 RH 7.3 Linux 系統下的(java+mysql)
程序有时候运行的时候会出现这个问题:看起來像是 MySQL 失去了连线
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1895)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2342)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2838)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1584)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1675)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2301)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2228)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1836)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1930)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1855)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1693)
at kvcmg.Manage_Subject.update_subject(Manage_Subject.java:524)
at kvcmg.DoSendMessage.run(DoSendMessage.java:181)
at kvcmg.ThreadPool$WorkerThread.run(ThreadPool.java:71)
** END NESTED EXCEPTION **
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2554)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2838)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1584)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1675)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2301)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2228)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1836)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1930)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1855)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1693)
at kvcmg.Manage_Subject.update_subject(Manage_Subject.java:524)
at kvcmg.DoSendMessage.run(DoSendMessage.java:181)
at kvcmg.ThreadPool$WorkerThread.run(ThreadPool.java:71)
请问,哪位高手帮我看一下?