Exception thrown when using Document Library (lportal 5.0.1) with Derby DB

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 5.0.1
• Fix Version/s: 5.2.0
• Component/s: None
• Labels: None
• Environment: Liferay Portal version 5.0.1; Derby DB 10.3
• Similar Issues: Show 5 results ; ;

  LEP-3841	Document Library doesnt work when using non-hsql db
  LEP-6328	improments in 5.0.1
  LEP-6272	Deploying liferay-portal-servicemix-4.2.x.war and liferay-portal-jbpm-4.2.x.war in glassfish gives exception on liferay 5.0.1 RC1
  LEP-7309	Null Pointer Exception Thrown When Properties Used
  LEP-2476	Edition of a document in the document library portlet

When I'm trying to access a folder in the document library that contains a file, then a Execpetion is thrown:
java.lang.ClassCastException: java.lang.Long cannot be cast to [Ljava.lang.Object;
at com.liferay.portlet.documentlibrary.service.persistence.DLFileEntryAndShortcutFinderImpl.findByFolderIds(DLFileEntryAndShortcutFinderImpl.java:156)
at com.liferay.portlet.documentlibrary.service.impl.DLFileEntryLocalServiceImpl.getFileEntriesAndShortcuts(DLFileEntryLocalServiceImpl.java:574)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
...

In "DLFileEntryAndShortcutFinderImpl.java" this statement is executed:
( SELECT folderId AS folderId, name AS name, title AS title, 0 AS fileShortcutId FROM DLFileEntry WHERE DLFileEntry.folderId = ? )
UNION ALL
( SELECT toFolderId AS folderId, toName AS name, DLFileEntry.title AS title, fileShortcutId AS fileShortcutId FROM DLFileShortcut
INNER JOIN DLFileEntry ON (DLFileEntry.folderId = DLFileShortcut.toFolderId) AND (DLFileEntry.name = DLFileShortcut.toName)
WHERE DLFileShortcut.folderId = ? ) ORDER BY title ASC

Code:
Iterator itr = QueryUtil.iterate(
q, HibernateUtil.getDialect(), begin, end);

while (itr.hasNext()) {
Object[] array = (Object[])itr.next();

Long folderId = (Long)array[0];
String name = (String)array[1];
//String title = (String)array[2];
long fileShortcutId = ((Long)array[3]).longValue();

Object obj = null;

if (fileShortcutId > 0)

{ obj = DLFileShortcutUtil.findByPrimaryKey(fileShortcutId); }

else

{ obj = DLFileEntryUtil.findByF_N(folderId.longValue(), name); }

fileEntriesAndShortcuts.add(obj);
}

If you are using HSLDB you get an Object[] for each iter.next()
but for Derby Db you get a Long representing the folderid.

Does anyone have solution for this?