BZ 1053726 - When process cannot open (for whatever reason), designer should open an empty editor

jbpm-designer-backend/src/main/java/org/jbpm/designer/server/service/DefaultDesignerAssetService.java

@@ -46,7 +46,7 @@ public class DefaultDesignerAssetService implements DesignerAssetService {
     @Inject
     private Event<ResourceOpenedEvent> resourceOpenedEvent;
 
-    private static final String PROCESS_STUB = "<?xml version=\"1.0\" encoding=\"UTF-8\"?> \n" +
+    public static final String PROCESS_STUB = "<?xml version=\"1.0\" encoding=\"UTF-8\"?> \n" +
     "<bpmn2:definitions xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns=\"http://www.omg.org/bpmn20\" xmlns:bpmn2=\"http://www.omg.org/spec/BPMN/20100524/MODEL\" xmlns:bpmndi=\"http://www.omg.org/spec/BPMN/20100524/DI\" xmlns:bpsim=\"http://www.bpsim.org/schemas/1.0\" xmlns:dc=\"http://www.omg.org/spec/DD/20100524/DC\" xmlns:drools=\"http://www.jboss.org/drools\" \n" +
         "id=\"Definition\" xsi:schemaLocation=\"http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd http://www.jboss.org/drools drools.xsd http://www.bpsim.org/schemas/1.0 bpsim.xsd\" expressionLanguage=\"http://www.mvel.org/2.0\" targetNamespace=\"http://www.omg.org/bpmn20\" typeLanguage=\"http://www.java.com/javaTypes\"> \n" +
     "   <bpmn2:process id=\"${processid}\" drools:packageName=\"org.jbpm\" drools:version=\"1.0\" name=\"\" isExecutable=\"true\"> \n" +

jbpm-designer-backend/src/main/java/org/jbpm/designer/web/profile/impl/JbpmProfileImpl.java

@@ -21,6 +21,7 @@ import org.jbpm.designer.bpmn2.resource.JBPMBpmn2ResourceImpl;
 import org.jbpm.designer.notification.DesignerNotificationEvent;
 import org.jbpm.designer.repository.Repository;
 import org.jbpm.designer.repository.UriUtils;
+import org.jbpm.designer.server.service.DefaultDesignerAssetService;
 import org.jbpm.designer.util.ConfigurationProvider;
 import org.jbpm.designer.web.plugin.IDiagramPlugin;
 import org.jbpm.designer.web.plugin.impl.PluginServiceImpl;
@@ -331,7 +332,10 @@ public class JbpmProfileImpl implements IDiagramProfile {
             return ((DocumentRoot) resource.getContents().get(0)).getDefinitions();
         } catch(Exception e) {
             _logger.error(e.getMessage());
-            throw new Exception(e);
+            String defaultProcessContent = DefaultDesignerAssetService.PROCESS_STUB.replaceAll( "\\$\\{processid\\}", "defaultprocessid" );
+            String errorMessages = "Unable to load process content due to errors. Displaying default process instead. Check logs for error details.";
+            notification.fire( new DesignerNotificationEvent( errorMessages, NotificationEvent.NotificationType.ERROR ) );
+            return getDefinitions(defaultProcessContent);
         }
     }