From 27e557bd83c308a5f4828c7b7c89fbd17c62b45e Mon Sep 17 00:00:00 2001
From: Terry Brady <terrywbrady@gmail.com>
Date: Wed, 28 Sep 2016 10:21:21 -0700
Subject: [PATCH] Prevent concurrent modification exception

---
 .../org/dspace/app/itemimport/ItemImportServiceImpl.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/dspace-api/src/main/java/org/dspace/app/itemimport/ItemImportServiceImpl.java b/dspace-api/src/main/java/org/dspace/app/itemimport/ItemImportServiceImpl.java
index 176d82b451..e424e75e6c 100644
--- a/dspace-api/src/main/java/org/dspace/app/itemimport/ItemImportServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/app/itemimport/ItemImportServiceImpl.java
@@ -561,10 +561,16 @@ public class ItemImportServiceImpl implements ItemImportService, InitializingBea
     {
         if (!isTest)
         {
+            ArrayList<Collection> removeList = new ArrayList<>();
             List<Collection> collections = myitem.getCollections();
 
-            // Remove item from all the collections it's in
+            // Save items to be removed to prevent concurrent modification exception DS-3322
             for (Collection collection : collections) {
+                removeList.add(collection);
+            }
+
+            // Remove item from all the collections it's in
+            for (Collection collection : removeList) {
                 collectionService.removeItem(c, collection, myitem);
             }
         }