Index: lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimAttachment.java
===================================================================
diff -u -rfa35e59e326d6f4e578ed0af472aca020bb7930b -r256fb72268608d83ddf4ba72a2d87dce2f94b201
--- lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimAttachment.java	(.../DimdimAttachment.java)	(revision fa35e59e326d6f4e578ed0af472aca020bb7930b)
+++ lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimAttachment.java	(.../DimdimAttachment.java)	(revision 256fb72268608d83ddf4ba72a2d87dce2f94b201)
@@ -59,7 +59,10 @@
 
     private Dimdim dimdim;
 
-    /** Constructor setting up all the properties except for dimdim one */
+    public DimdimAttachment() {
+
+    }
+
     public DimdimAttachment(Long fileVersionId, String fileType, String fileName, Long fileUuid, Date createDate) {
 	this.fileVersionId = fileVersionId;
 	this.fileType = fileType;
Index: lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimUser.java
===================================================================
diff -u -rfa35e59e326d6f4e578ed0af472aca020bb7930b -r256fb72268608d83ddf4ba72a2d87dce2f94b201
--- lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimUser.java	(.../DimdimUser.java)	(revision fa35e59e326d6f4e578ed0af472aca020bb7930b)
+++ lams_tool_dimdim/src/java/org/lamsfoundation/lams/tool/dimdim/model/DimdimUser.java	(.../DimdimUser.java)	(revision 256fb72268608d83ddf4ba72a2d87dce2f94b201)
@@ -58,6 +58,10 @@
 
     // Constructors
 
+    public DimdimUser() {
+
+    }
+
     public DimdimUser(UserDTO user, DimdimSession dimdimSession) {
 	this.userId = new Long(user.getUserID().intValue());
 	this.firstName = user.getFirstName();