Backstage reporting error when add a New DM Document Type

• Type: Regression Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: 7.1.10.2 SP2
• Fix Version/s: None
• Component/s: Documents & Media
• Labels:
  • QA-AUTOMATION
• QA Test Name:
  • LocalFile.Staging#StagingDemoDocumentsAndMedia
• QA Test Score: 5

Baseline : liferay-dxp-7.1.10.2-sp2 + fix-pack-dxp-11-7110

Failed on liferay-dxp-7.1.10.2-sp2 + fix-pack-dxp-11-7110 + hotfix-3105
testray:Staging#StagingDemoDocumentsAndMedia

2020-01-20 00:44:36.726 ERROR [http-nio-8080-exec-10][edit_file_entry_jsp:2179] java.lang.NullPointerException
java.lang.NullPointerException
        at org.apache.jsp.document_005flibrary.edit_005ffile_005fentry_jsp._jspService(edit_005ffile_005fentry_jsp:2153)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:319)
        at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:330)
        at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
        at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62)
        at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
        at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
        at com.liferay.portlet.internal.PortletRequestDispatcherImpl.dispatch(PortletRequestDispatcherImpl.java:318)
        at com.liferay.portlet.internal.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:128)
        at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.include(MVCPortlet.java:592)
        at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.include(MVCPortlet.java:608)
        at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.doDispatch(MVCPortlet.java:489)
        at javax.portlet.GenericPortlet.render(GenericPortlet.java:291)
        at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.render(MVCPortlet.java:316)
        at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:127)
        at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:58)
        at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:124)
        at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:71)
        at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:108)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
        at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62)
        at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
        at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
        at com.liferay.portlet.internal.InvokerPortletImpl.invoke(InvokerPortletImpl.java:569)
        at com.liferay.portlet.internal.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:665)
        at com.liferay.portlet.internal.InvokerPortletImpl.render(InvokerPortletImpl.java:362)
        at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.lambda$render$0(MonitoringInvokerPortlet.java:280)
        at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet._render(MonitoringInvokerPortlet.java:383)
        at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.render(MonitoringInvokerPortlet.java:278)
        at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1534)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at com.liferay.portal.servlet.DirectRequestDispatcher.include(DirectRequestDispatcher.java:64)
        at com.liferay.portal.servlet.DirectRequestDispatcherFactoryImpl$IndirectRequestDispatcher.include(DirectRequestDispatcherFactoryImpl.java:202)

Reproduce :
1. create a new public Widget page;
2. add Documents and Media in the new page;
3. add a new folder;
4. goto Control Panel>Conten>Documents and Media;
5. add a New Metadata Set, named "DM Metadata Set Name";
6. add a New Document Type named "DM Document Type Name" with the new metadata;
7. goto the new page, click the new folder;
8. add a new "DM Document Type Name" document;

Expected result: open the "New DM Docment Type Name" successfully, and No background error.

Actual result: open the "New DM Docment Type Name" successfully, but backstage reporting error.