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java.lang.NullPointerException: 	at com.atlassian.confluence.mail.notification.persistence.dao.hibernate.HibernateNotificationDao.findNotificationByUserAndPage(HibernateNotificationDao.java:40)	at com.atlassian.confluence.mail.notification.DefaultNotificationManager.getNotificationByUserAndPage(DefaultNotificationManager.java:38)	at com.atlassian.confluence.mail.notification.DefaultNotificationManager.addNotification(DefaultNotificationManager.java:67)	at com.atlassian.confluence.mail.notification.DefaultNotificationManager.addPageNotification(DefaultNotificationManager.java:48)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:59)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:201)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)	at com.atlassian.confluence.util.profiling.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:17)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:196)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:154)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:196)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:135)	at $Proxy110.addPageNotification(Unknown Source)	at com.atlassian.confluence.mail.notification.actions.AddPageNotificationAction.execute(AddPageNotificationAction.java:30)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:171)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:58)	at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:34)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.atlassian.confluence.core.ConfluenceValidationInterceptor.intercept(ConfluenceValidationInterceptor.java:18)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.atlassian.confluence.security.actions.PermissionCheckInterceptor.intercept(PermissionCheckInterceptor.java:40)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116)	at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:182)	at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:162)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:971)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:402)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:129)	at com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(ProfilingPageFilter.java:36)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:61)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:161)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:181)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:100)	at com.atlassian.confluence.setup.SpringSessionInViewFilter.doFilterInternal(SpringSessionInViewFilter.java:32)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:57)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:38)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6356)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3635)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)