Length property must be always present

src/main/java/it/inaf/oats/vospace/persistence/NodeDAO.java

@@ -187,8 +187,9 @@ public class NodeDAO {
 
         List<Property> properties = new ArrayList<>();
 
-        addProperty(NodeProperties.LENGTH_URI, rs.getString("content_length"),
-                properties);
+        // Content length is required for CADC client compatibility
+        String contentLength = rs.getString("content_length");
+        addProperty(NodeProperties.LENGTH_URI, contentLength == null ? "0" : contentLength, properties);
 
         String creationTime = rs.getString("created_on").replace(" ", "T");
         

src/test/java/it/inaf/oats/vospace/persistence/NodeDAOTest.java

@@ -59,7 +59,8 @@ public class NodeDAOTest {
         ContainerNode root = (ContainerNode) dao.listNode("/").get();
         assertEquals(2, root.getNodes().size());
 
-        assertEquals("true", NodeProperties.getNodePropertyAsListByURI(root, NodeProperties.PUBLIC_READ_URI).get(0));
+        assertEquals("true", NodeProperties.getNodePropertyByURI(root, NodeProperties.PUBLIC_READ_URI));
+        assertEquals("0", NodeProperties.getNodePropertyByURI(root, NodeProperties.LENGTH_URI));
 
         assertEquals("group1 group2", NodeProperties.getNodePropertyByURI(root.getNodes().get(0), NodeProperties.GROUP_READ_URI));