I'm loading some data into the DataStore in the background. When I
run queries against the same Kind I occasionally get exceptions:
java.util.ConcurrentModificationException
at java.util.LinkedHashMap$LinkedHashIterator.nextEntry
(LinkedHashMap.java:373)
at java.util.LinkedHashMap$ValueIterator.next(LinkedHashMap.java:388)
at java.util.AbstractCollection.toArray(AbstractCollection.java:124)
at java.util.ArrayList.(ArrayList.java:131)
at
com.google.appengine.api.datastore.dev.LocalDatastoreService.runQuery
(LocalDatastoreService.java:576)
at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.makeSyncCall
(ApiProxyLocalImpl.java:108)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:79)
at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall
(DatastoreApiHelper.java:52)
at com.google.appengine.api.datastore.DatastoreServiceImpl
$PreparedQueryImpl.runQuery(DatastoreServiceImpl.java:346)
at com.google.appengine.api.datastore.DatastoreServiceImpl
$PreparedQueryImpl.access$100(DatastoreServiceImpl.java:272)
at com.google.appengine.api.datastore.DatastoreServiceImpl
$PreparedQueryImpl$1.iterator(DatastoreServiceImpl.java:306)
at org.simpleds.EntityManagerImpl.find(EntityManagerImpl.java:64)
This seems like an issue in the LocalDatastoreService. It appears
it's sharing unsynchronized data structures with the code that's doing
the writes.
Is that right? Or am I misunderstanding this stack trace?
thanks
-- James
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