Fixed ALF-3884: Share does not report access denied exceptions correctly

- Restored error 'Access Denied. The system is currently in read-only mode.'
 - Share does not respect a read-only system at all ... raising


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@22343 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/node/AbstractNodeDAOImpl.java

@@ -79,6 +79,7 @@ import org.alfresco.service.cmr.repository.Path;
 import org.alfresco.service.cmr.repository.StoreRef;
 import org.alfresco.service.cmr.repository.NodeRef.Status;
 import org.alfresco.service.namespace.QName;
+import org.alfresco.service.transaction.ReadOnlyServerException;
 import org.alfresco.util.EqualsHelper;
 import org.alfresco.util.GUID;
 import org.alfresco.util.Pair;
@@ -530,7 +531,7 @@ public abstract class AbstractNodeDAOImpl implements NodeDAO, BatchingDAO
         // Check that this is a writable txn
         if (AlfrescoTransactionSupport.getTransactionReadState() != TxnReadState.TXN_READ_WRITE)
         {
-            throw new IllegalStateException("Transaction entries can only be created for writable transactions");
+            throw new ReadOnlyServerException();
         }
         // Have to create a new transaction entry
         Long serverId = getServerId();