我放了一個Java的Web工程到一個美國的主機，數據庫用的是mysql，但有時候出現訪問錯誤

下面是后臺日志

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:1865)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2256)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2756)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1536)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1626)

at com.mysql.jdbc.Connection.execSQL(Connection.java:3031)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:943)

at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1049)

at dbmanager.DBManager.ExcuteQueryBySql(DBManager.java:251)

at dao.ProductDao.SelectProductType(ProductDao.java:159)

at org.apache.jsp.ProductShow.ProductDetail_jsp._jspService(ProductDetail_jsp.java:77)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)

at org.a

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