[JIRA] Created: (CAY-796) Deserialization of DataContext fails when useSharedCache is false

["bob schellink (JIRA)" <de...@cayenne.apache.org>]

Deserialization of DataContext fails when useSharedCache is false
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                 Key: CAY-796
                 URL: https://issues.apache.org/cayenne/browse/CAY-796
             Project: Cayenne
          Issue Type: Bug
          Components: Cayenne Core Library
    Affects Versions: 1.2 [STABLE], 2.0 [STABLE]
         Environment: JDK 1.5, Windows XP
            Reporter: bob schellink
            Assignee: Andrus Adamchik


Sometimes while developing with Tomcat I get the exception below. This occurs when DataContext is serialized.

Exception in thread "main" org.objectstyle.cayenne.CayenneRuntimeException: [v.1.2.3 May 6 2007] Commit Exception
org.objectstyle.cayenne.access.DataContext.flushToParent(DataContext.java:1290)
org.objectstyle.cayenne.access.DataContext.commitChanges(DataContext.java:1166)
test.SerializeDCTest.main(SerializeDCTest.java:29)

Caused by: java.lang.NullPointerException
org.objectstyle.cayenne.access.DataRowStore.sendUpdateNotification(DataRowStore.java:709)
org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges(DataRowStore.java:574)
org.objectstyle.cayenne.access.DataDomainFlushAction.postprocess(DataDomainFlushAction.java:278)
org.objectstyle.cayenne.access.DataDomainFlushAction.flush(DataDomainFlushAction.java:178)
org.objectstyle.cayenne.access.DataDomain.onSyncFlush(DataDomain.java:846)
org.objectstyle.cayenne.access.DataDomain$2.transform(DataDomain.java:817)
org.objectstyle.cayenne.access.DataDomain.runInTransaction(DataDomain.java:872)
org.objectstyle.cayenne.access.DataDomain.onSync(DataDomain.java:814)
org.objectstyle.cayenne.access.DataContext.flushToParent(DataContext.java:1262) 


Here is a little test to reproduce the error:

package test;

import test.cayenne.Employee;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import org.objectstyle.cayenne.DataObjectUtils;
import org.objectstyle.cayenne.access.DataContext;
import org.objectstyle.cayenne.query.SelectQuery;

public class SerializeDCTest {

    public SerializeDCTest() {
    }

    public static void main(String[] args) {
        //boolean useSharedCache = true; //works
        boolean useSharedCache = false;
        DataContext context = DataContext.createDataContext(useSharedCache);
        context = serializeDC(context);
        Employee emp = (Employee) DataObjectUtils.objectForPK(context, Employee.class, 740);
        emp.setFirstname("test" + Math.random());
        context.commitChanges();
    }

    public static DataContext serializeDC(DataContext dc) {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(dc);

            ByteArrayInputStream is = new ByteArrayInputStream(bos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(is);
            DataContext result = (DataContext) ois.readObject();
            return result;

        } catch (Exception ex) {
            throw new RuntimeException("DataContext serialization failed", ex);
        }
    }
} 

Note that if useSharedCache = true, then it works fine.

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