Error
 
 
Exception: java.lang.NumberFormatException: null

java.lang.NumberFormatException: null
	at java.lang.Long.parseLong(Long.java:372)
	at java.lang.Long.(Long.java:671)
	at com.depthfirst.dola.web.activity.servlet.ActivityServlet.service(ActivityServlet.java:30)
	at com.depthfirst.dola.web.util.WebServlet.service(WebServlet.java:64)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:272)
	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.dola.web.counter.servlet.PageOnlineCounterFilter.doFilter(PageOnlineCounterFilter.java:103)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.dola.web.filter.ThaiLocalAdminFilter.doFilter(ThaiLocalAdminFilter.java:34)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at test.LoggerFilter.doFilter(LoggerFilter.java:53)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.filter.MultipartServletFilter.doFilter(MultipartServletFilter.java:50)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at com.depthfirst.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:28)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:151)
	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:129)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3151)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1973)
	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1880)
	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1310)
	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
	at weblogic.work.ExecuteThread.run(ExecuteThread.java:179)