 java.lang.NullPointerException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at com.fr.data.pool.MemoryConnection.getDefaultValidationQuery(Unknown Source) at com.fr.data.pool.MemoryConnection.getDataSource(Unknown Source) at com.fr.data.pool.MemoryConnection.create(Unknown Source) at com.fr.data.impl.JDBCDatabaseConnection.createConnection(Unknown Source) at com.fr.record.DBRecordManager.init(Unknown Source) at com.fr.record.DBRecordManager.recordFSInfo(Unknown Source) at com.fr.fs.web.service.FSOpenEntryService.recordSignIn(Unknown Source) at com.fr.fs.web.service.FSOpenEntryService.process(Unknown Source) at com.fr.stable.fun.impl.NoSessionIDService.process(Unknown Source) at com.fr.web.core.ReportDispatcher.dealWithOp(Unknown Source) at com.fr.web.core.ReportDispatcher.dealWeblet(Unknown Source) at com.fr.web.core.ReportDispatcher.dealWithRequest(Unknown Source) at com.fr.web.BaseServlet.doGet(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:596) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428) at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:473) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568) at org.mortbay.http.HttpContext.handle(HttpContext.java:1530) at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633) at org.mortbay.http.HttpContext.handle(HttpContext.java:1482) at org.mortbay.http.HttpServer.service(HttpServer.java:909) at org.mortbay.http.HttpConnection.service(HttpConnection.java:820) at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986) at org.mortbay.http.HttpConnection.handle(HttpConnection.java:837) at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245) at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357) at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)登录页面，输入密码之后登录就显示以下信息，刷新一下就又可以了，是什么问题导致的啊？请各位大神帮忙看看 |
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