NullPointerException in ERXBatchingDisplayGroup.rowCount when used with objectArray

[NochEinKamel]

I'm using an ERXFlickrBatchNavigation to display an ERXBatchingDisplayGroup to display an manually filtered objectArray.

_acls = new ERXBatchingDisplayGroup<CRACL>();
_acls.setObjectArray(someArray);    
_acls.setNumberOfObjectsPerBatch(30);

In ERXBatchingDisplayGroup the method displayNameCount calls rowCount() in case the displayGroup is an ERXBatchingDisplayGroup

public Integer displayNameCount(){
...
        if (displayGroup() instanceof ERXBatchingDisplayGroup) {
            displayNameCount = Integer.valueOf(((ERXBatchingDisplayGroup)displayGroup()).rowCount());
...     
    return displayNameCount;
}

In ERXBatchingDisplayGroup a null-check is missing:

...
else {
    rowCount = dataSource().fetchObjects().count();
}
...

Possible fix:

if (dataSource() != null) {
    rowCount = dataSource().fetchObjects().count();
}
else if (allObjects() != null) {
    rowCount = allObjects().count();
}

[darkv]

If you need a display group for a simple object array you probably should use ERXDisplayGroup instead as ERXBatchingDisplayGroup is primarily to avoid fetching too many objects from database. Though ERXBatchingDisplayGroup should be fixed.

Fixed in integration 1e318ba