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[CDO] Offline Master/Clone example throws NPE [message #1853924]

Sat, 23 July 2022 21:06

Jay Graham

Messages: 13
Registered: September 2013

Junior Member

Never mind, I see from other posts that maybe offline replication is currently broken. Thank you anyway :)

When I run the OfflineExampleMaster.java and OfflineExampleClone.java examples, OfflineExampleMaster throws the following NPE:

Unregistered Session7 [repo1]
Registered Session8 [repo1]
[ERROR] NullPointerException
java.lang.NullPointerException
at org.eclipse.net4j.db.DBUtil.serializeTable(DBUtil.java:1217)
at org.eclipse.net4j.db.DBUtil.serializeTable(DBUtil.java:1208)
at org.eclipse.emf.cdo.server.internal.db.mapping.horizontal.AbstractHorizontalMappingStrategy.rawExport(AbstractHorizontalMappingStrategy.java:236)
at org.eclipse.emf.cdo.server.internal.db.DBStoreAccessor.rawExport(DBStoreAccessor.java:1346)
at org.eclipse.emf.cdo.internal.server.Repository.replicateRaw(Repository.java:1901)
at org.eclipse.emf.cdo.server.internal.net4j.protocol.ReplicateRepositoryRawIndication.responding(ReplicateRepositoryRawIndication.java:70)
at org.eclipse.emf.cdo.server.internal.net4j.protocol.CDOServerIndicationWithMonitoring.responding(CDOServerIndicationWithMonitoring.java:185)
at org.eclipse.net4j.signal.IndicationWithMonitoring.responding(IndicationWithMonitoring.java:68)
at org.eclipse.net4j.signal.IndicationWithResponse.doExtendedOutput(IndicationWithResponse.java:100)
at org.eclipse.net4j.signal.Signal.doOutput(Signal.java:392)
at org.eclipse.net4j.signal.IndicationWithResponse.execute(IndicationWithResponse.java:74)
at org.eclipse.emf.cdo.server.internal.net4j.protocol.CDOServerReadIndicationWithMonitoring.execute(CDOServerReadIndicationWithMonitoring.java:36)
at org.eclipse.net4j.signal.Signal.runSync(Signal.java:329)
at org.eclipse.net4j.signal.SignalReactor.runSync(SignalReactor.java:97)
at org.eclipse.net4j.signal.Signal.run(Signal.java:201)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)

Setting the IMappingStrategy.Props.EAGER_TABLE_CREATION property to "true" in the AbstractOfflineExampleServer.createStore like this:

protected IStore createStore()
{
JdbcDataSource dataSource = new JdbcDataSource();
dataSource.setURL("jdbc:h2:database/" + name);

IMappingStrategy mappingStrategy = CDODBUtil.createHorizontalMappingStrategy(true, true);
Map<String, String> mappingProps = mappingStrategy.getProperties();
mappingProps.put(IMappingStrategy.Props.EAGER_TABLE_CREATION, "true");
IDBAdapter dbAdapter = new H2Adapter();
IDBConnectionProvider dbConnectionProvider = dbAdapter.createConnectionProvider(dataSource);
return CDODBUtil.createStore(mappingStrategy, dbAdapter, dbConnectionProvider);
}

appears to fix the problem.

Is the the proper way to handle the issue I'm seeing?

Thank you,
Jay

[Updated on: Sun, 24 July 2022 00:33]

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Re: [CDO] Offline Master/Clone example throws NPE [message #1853940 is a reply to message #1853924]

Mon, 25 July 2022 07:23

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Sorry, we didn't have the resources to keep the offline clone features up to date with all the other enhancements of CDO.
The company that funded the development of the offline functionality ended their support many years ago.
How critical is this feature for you?

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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