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RSS订阅原创 eclipse编译一个类的时候提示A class file was not written，并且不能生成class
A class file was not written. The project may be inconsistent, if so try refreshing this project and building it.1、工作空间的磁盘空间很大2、也没有使用如下关键字：CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM...
2018-04-20 14:33:54
935
原创 发布的服务报错，日志中所指的文件信息不是指向服务器的路径
日志内容如下：[18-4-19 13:57:08:588 CST] 00000027 SystemErr R Caused by: java.lang.Error: Unresolved compilation problems: Access restriction: The constructor BASE64Encoder() is not accessible due to re...
2018-04-20 10:19:54
286
原创 servlet实现文件下载
public void execute(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { response.setContentType("application/download"); String filename=request.getParame
2018-02-07 10:42:00
198
原创 db2/oracle对表中数据随机抽样100条记录SQL
SELECT * FROM (SELECT * FROM TABLE_NAME ORDER BY RAND() FETCH FIRST 100 ROWS ONLY);SELECT * FROM (SELECT * FROM TABLE_NAME ORDER BY DBMS_RANDOM.random) WHERE ROWNUM <= 100;
2018-02-07 10:36:26
1588
原创 was（websphere）启动服务java.sql.SQLRecoverableException
系统在启动的时候抛出异常com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5a285a28 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed
2017-12-23 17:43:10
1053
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