Hibernate 几秒钟后发生JSP500错误

下面是hibernate.cfg.xml文件

<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://ip:3306/database</property>
    <property name="hibernate.connection.username">user</property>
    <property name="hibernate.connection.password">pass</property>
   <property name="hibernate.connection.pool_size">50</property>
   <property name="show_sql">true</property>
   <property name="current_session_context_class">thread</property>

    <mapping resource="user_detail.xml"/>
  </session-factory>

</hibernate-configuration>

下面是index.jsp

     String username = "user";
     List<user_detail> list = selectData.getData(username);

                for (user_detail detail: list)
                {
                    divertedRoute = detail.getDivertedRoute();
                    credit = detail.getRate();
                }

再次击球后，我的反应很好。但为什么会出现这个问题呢？ java.lang.NullPointerException

我检查了hibernate日志，发现

org.hibernate.exception.JDBCConnectionException: could not execute query

下面是整个stacktrace-

SEVERE: Servlet.service() for servlet [jsp] in context with path [/smppBalanceDeduct] threw exception [An exception occurred processing JSP page /index.jsp at line 38

35:          //   selectData sData = new selectData();
36:             List<user_detail> list = selectData.getData(username);
37:             selectData.descLog("listing is:"+list);
38:             for (user_detail detail: list)
39:             {
40:                 divertedRoute = detail.getDivertedRoute();
41:                 credit = detail.getRate();


Stacktrace:] with root cause
java.lang.NullPointerException
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:100)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:724)

SEVERE:Servlet[jsp]的Servlet.service（）在路径为[/smppbalancedector]的上下文中引发异常[在第38行处理jsp页面/index.jsp时发生异常]
35://selectData sData=new selectData（）；
36:List List=selectData.getData（用户名）；
37:selectData.descLog（“列表为：”+list）；
38:for（用户详细信息：列表）
39:             {
40:divertedRoute=detail.getDivertedRoute（）；
41:credit=detail.getRate（）；
Stacktrace:]具有根本原因
java.lang.NullPointerException
在org.apache.jsp.index\u jsp.\u jsp服务（index\u jsp.java:100）上
位于org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:70）
位于javax.servlet.http.HttpServlet.service（HttpServlet.java:727）
位于org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:432）
位于org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:390）
位于org.apache.jasper.servlet.JspServlet.service（JspServlet.java:334）
位于javax.servlet.http.HttpServlet.service（HttpServlet.java:727）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:303）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）
位于org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:241）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）
位于org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:220）
位于org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:122）
位于org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:501）
位于org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:171）
位于org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）
位于org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:950）
位于org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:116）
位于org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:408）
位于org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1040）
位于org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process（AbstractProtocol.java:607）
位于org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run（JIoEndpoint.java:314）
位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145）
位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:615）
位于org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run（TaskThread.java:61）
运行（Thread.java:724）

…可能是整个堆栈跟踪？什么是空的？在哪里？@DaveNewton我认为错误与hibernate有关。当我同时收到500个错误时，我会收到“无法执行查询”异常。但我不知道如何解决它。你可以先发布整个堆栈跟踪。我添加了堆栈跟踪。请检查

org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 38

org.hibernate.exception.JDBCConnectionException: could not execute query

SEVERE: Servlet.service() for servlet [jsp] in context with path [/smppBalanceDeduct] threw exception [An exception occurred processing JSP page /index.jsp at line 38

35:          //   selectData sData = new selectData();
36:             List<user_detail> list = selectData.getData(username);
37:             selectData.descLog("listing is:"+list);
38:             for (user_detail detail: list)
39:             {
40:                 divertedRoute = detail.getDivertedRoute();
41:                 credit = detail.getRate();


Stacktrace:] with root cause
java.lang.NullPointerException
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:100)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:724)