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問題
サイトナビゲーションメニューが編集できなくなり、開くとエラーメッセージとログに例外が表示されることに気づきました： <Menu> is temporarily unavailable.
java.lang.NullPointerException: null at com.liferay.site.navigation.admin.web.internal.display.context.SiteNavigationAdminDisplayContext._getDefaultDDMTemplateKey(SiteNavigationAdminDisplayContext.java:483) ~[?:?] at com.liferay.site.navigation.admin.web.internal.display.context.SiteNavigationAdminDisplayContext.lambda$_getDDMTemplatesJSONArray$10(SiteNavigationAdminDisplayContext.java:458) ~[?:?] at com.liferay.portal.json.JSONObjectImpl.put(JSONObjectImpl.java:357) ~[portal-impl.jar:?] at com.liferay.site.navigation.admin.web.internal.display.context.SiteNavigationAdminDisplayContext._getDDMTemplatesJSONArray(SiteNavigationAdminDisplayContext.java:453) ~[?:?] at com.liferay.site.navigation.admin.web.internal.display.context.SiteNavigationAdminDisplayContext.getSiteNavigationContext(SiteNavigationAdminDisplayContext.java:269) ~[?:?] at org.apache.jsp.edit_005fsite_005fnavigation_005fmenu_jsp._jspService(edit_005fsite_005fnavigation_005fmenu_jsp.java:251) ~[?:?] at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111) ~[jasper.jar:9.0.75] at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[servlet-api.jar:4.0.FR] at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411) ~[jasper.jar:9.0.75] at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473) ~[jasper.jar:9.0.75] at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377) ~[jasper.jar:9.0.75] at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[servlet-api.jar:4.0.FR] at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:328) ~[?:?] at com.liferay.portal.osgi.web.servlet.jsp.compiler.internal.JspServlet.service(JspServlet.java:340) ~[?:?] 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:63) ~[?:?] 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:291) ~[portal-impl.jar:?] at com.liferay.portlet.internal.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:123) ~[portal-impl.jar:?]