[xwiki-users] Question on copying Objects

Hi, I have a question when copying an object from a page onto another page according to (abbreviated) method below. BaseObject sourceResultaatObject = getObject(sourceResultaattype, RESULTAATTYPECLASSREFERENCE); // gets a BaseObject from a page based on the two DocumentReferences for the source and the class (custom method) BaseObject destinationResultaatObject = sourceResultaatObject.duplicate(); List<String> sourceResultaattypeLeidtTotBesluittype = sourceResultaatObject.getListValue(LEIDTTOTBESLUITTYPE) // contents = [“BST_ER5MLpodilPv6”,"BST_622yQb1ktyvV6"]; .. destinationResultaatObject.setDBStringListValue(LEIDTTOTBESLUITTYPE, sourceResultaattypeLeidtTotBesluittype); .. XWikiDocument XWikiDoc = createPage(destinationResultaattype); // destinationResultaattype is a newly created DocumentReference XWikiDoc.addXObject(destinationResultaatObject); savePage(XWikiDoc); // a custom method to save the XWikiPage. sourceResultaatObject = getObject(sourceResultaattype, RESULTAATTYPECLASSREFERENCE); logger.trace(sourceResultaatObject.toXMLString()); End result I expect to be: SourceObject: property LEIDTTOTBESLUITTYPE = [“BST_ER5MLpodilPv6”,"BST_622yQb1ktyvV6"]; DestinationObject: property LEIDTTOTBESLUITTYPE = [“BST_ER5MLpodilPv6”,"BST_622yQb1ktyvV6"]; When I display the old Object immediately after the savePage (toXMLString), the result is, that the DBList field is also showing both items. However: When I display the page showing the object (using a sheet), the data is gone and the DBList is empty. And it looks like it takes a few seconds for this to show up this way. The only solution I have come up with is to fill the List<String> using a for loop. In that case, it is working fine. Maybe I’m missing an essential Java item here but it looks like, when I am assigning the DBList values to the List<String> variable, it does not copy the data but creates an object link. When assigning it to the new object DBList the old link is removed. What I do not understand is, that it takes some time before Wiki (or is it?) realizes that it has to remove the DBList values from the sourceObject. Can anyone explain what is happening here? It would be much appreciated. Peter