Hi,
I am new to both GAE and JDO. I would be grateful if someone could provide
guidance on a behavior I find rather counter-intuitive. In the following
code, I have to call pm.evictAll() to successfully/persistently change
properties (labels) on a freshly persisted object (bookmark):
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
Bookmark bookmark = new Bookmark(url);
bookmark = pm.makePersistent(bookmark);
pm.evictAll();
Key k = bookmark.getKey();
bookmark = pm.getObjectById(Bookmark.class, k);
bookmark.addLabels(labels);
} finally {
pm.close();
}
I'd naively expect the above code to persistently adding labels to
bookmarkseven without calling
pm.evictAll()and with explicitly (re-)fetching the bookmark object. I'd
expect JDO to "notice" that the Bookmark instance has been "dirtied" and
pm.close() to persist the changes to the cached object.
I find it also counter-intuitive that pm.evict(bookmark) doesn't work --
the entire cache needs to be cleared for new labels on bookmark to get
persisted. (Even though pm.evict(Object) appears to expect a *
persistent-clean* object, which, in turn, appears to assume being in a
transaction...)
Any pointers on the reasons of this behavior will be gratefully appreciated.
Peter
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