BIS-998: Fixes to tar export

core-plugin-openbis/dist/core-plugins/imaging/1/dss/services/imaging/lib/imaging-technology-sources/source/java/ch/ethz/sis/openbis/generic/server/dss/plugins/imaging/ImagingArchiver.java

@@ -120,7 +120,7 @@ class ImagingArchiver
                 {
                     packager.addEntry(path,
                             file.lastModified(),
-                            file.getTotalSpace(),
+                            Files.size(file.toPath()),
                             checksumFunction.apply(new FileInputStream(file)),
                             new FileInputStream(file));
                 } catch (IOException exc)

core-plugin-openbis/dist/core-plugins/imaging/1/dss/services/imaging/lib/imaging-technology-sources/source/java/ch/ethz/sis/openbis/generic/server/dss/plugins/imaging/ImagingService.java

@@ -178,6 +178,11 @@ public class ImagingService implements ICustomDSSServiceExecutor
 
         Serializable[] exportTypes = (Serializable[]) exportConfig.get("include");
 
+        if(exportTypes == null)
+        {
+            throw new UserFailureException("At least single export needs to be configured!");
+        }
+
         ImagingArchiver archiver;
 
         // Prepare archiver
@@ -256,6 +261,11 @@ public class ImagingService implements ICustomDSSServiceExecutor
 
                 Serializable[] exportTypes = (Serializable[]) exportConfig.get("include");
 
+                if(exportTypes == null)
+                {
+                    throw new UserFailureException("At least single export needs to be configured!");
+                }
+
                 // For each export type, perform adequate action
                 for (Serializable exportType : exportTypes)
                 {