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[CDO] Getting UnsupportedOperationException While running OCL query on mongodb [message #1759632]

Fri, 14 April 2017 07:42

pradeep potti

Messages: 3
Registered: April 2017

Junior Member

Hi all,

I'm working on some project using CDO . i try OCL query on mongoDB But on server side I got Exception

Exception in thread "OCLExtentIterator" java.lang.UnsupportedOperationException: Not yet implemented
at org.eclipse.emf.cdo.server.internal.mongodb.MongoDBStoreAccessor.handleRevisions(MongoDBStoreAccessor.java:105)
at org.eclipse.emf.cdo.server.ocl.CDOExtentCreator.handleRevisions(CDOExtentCreator.java:173)
at org.eclipse.emf.cdo.server.ocl.CDOExtentCreator.createExtent(CDOExtentCreator.java:147)
at org.eclipse.emf.cdo.server.ocl.CDOExtentCreator$Lazy$1$1.handlePersistentState(CDOExtentCreator.java:318)
at org.eclipse.emf.cdo.server.ocl.CDOExtentCreator$Lazy$1$1.run(CDOExtentCreator.java:262)

For query ==>
CDOQuery cdoQuery = transaction.createQuery("ocl", "Company.allInstances()->select(company:Company | company.name = 'TEST')");
List<Company> result1 = cdoQuery.getResult(Company.class);

Can any one please help me to resolve this exception

Thanks,
Pradeep.

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Re: [CDO] Getting UnsupportedOperationException While running OCL query on mongodb [message #1759802 is a reply to message #1759632]

Tue, 18 April 2017 15:12

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

I'm guessing a bit. but:

allInstances() is quite challenging since it requires an iteration over many, possibly all, instances within some extent to select the relevant elements. The extent is ill-defined, but the basic OCL support takes it as all EObjects in all Resources in the containing ResourceSet. CDO has its own interpretation presumably corresponding to all EObjects in the database.

IIRC a bug in respect of whether all exact types or all conformant types for abstract types should be returned was fixed. allInstances() must have worked at that time, so it's unlikely to be a fundamental CDO/OCL limitation.

Probably it's just the mongoDB integration that has neglected to implement the required iterator.

Please raise a CDO bug with a repro.

Regards

Ed Willink

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