arender-html-perf.log:
Start=2019-03-14 12:13:53,645 || End=2019-03-14 12:13:53,766 || TimeMs=121 || User=null || Method=ServletDocumentService.getDocumentLayout(..) || MimeType=null || DocumentId=b64_ZGVmYXVsdCwwYTVjOWFmMy01MGI2LTQzY2ItODlhNi0wZjA1ODI1OTQyYzksZmlsZTpjb250ZW50QWRtaW5pc3RyYXRvcg || Result=KO || Exception=Could not get document service delegate || Args=[]

navigator console:
http://localhost:8080/ARender/arende…rViewerService 500

Thu Mar 14 14:03:17 GMT+100 2019 com.arondor.viewer.client.pictree.documentlayout.PicTreeDocumentLayoutController
SEVERE: Cannot resolve DocumentReference for (U1, b64_ZGVmYXVsdCwwYTVjOWFmMy01MGI2LTQzY2ItODlhNi0wZjA1ODI1OTQyYzksZmlsZTpjb250ZW50QWRtaW5pc3RyYXRvcg)

arendergwt-0.js:2536 Thu Mar 14 14:03:17 GMT+100 2019 com.arondor.viewer.client.controllers.impl.DocumentLoadControllerImpl
SEVERE: Could not resolve document reference : b64_ZGVmYXVsdCw5NzIwYzY2YS0xMTZmLTRjM2UtYmM2Yy03NmNmNjY1YTQ3YzYsZmlsZTpjb250ZW50QWRtaW5pc3RyYXRvcg
com.google.gwt.user.client.rpc.StatusCodeException: 500 The call failed on the server; see server log for details