IStructuredSelection sel = (IStructuredSelection) tableViewer.getSelection();
if(sel.getFirstElement() != null){
	Person p = (Person) sel.getFirstElement();
	personResource.getContents().remove(p);
					
	try {
		personResource.save(null);
	} catch (IOException e1) {
		e1.printStackTrace();
	}
}

Caused by: java.lang.UnsupportedOperationException
	at org.eclipse.emf.cdo.internal.net4j.protocol.CommitDelegationRequest.getObjectType(CommitDelegationRequest.java:59)
	at org.eclipse.emf.cdo.internal.net4j.protocol.CommitTransactionRequest.requestingCommit(CommitTransactionRequest.java:222)
	at org.eclipse.emf.cdo.internal.net4j.protocol.CommitTransactionRequest.requesting(CommitTransactionRequest.java:128)
	at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientRequestWithMonitoring.requesting(CDOClientRequestWithMonitoring.java:91)
	at org.eclipse.net4j.signal.RequestWithMonitoring.requesting(RequestWithMonitoring.java:165)
	at org.eclipse.net4j.signal.RequestWithConfirmation.doExtendedOutput(RequestWithConfirmation.java:119)
	at org.eclipse.net4j.signal.Signal.doOutput(Signal.java:298)
	at org.eclipse.net4j.signal.RequestWithConfirmation.doExecute(RequestWithConfirmation.java:104)
	at org.eclipse.net4j.signal.RequestWithMonitoring.doExecute(RequestWithMonitoring.java:235)
	at org.eclipse.net4j.signal.SignalActor.execute(SignalActor.java:53)
	at org.eclipse.net4j.signal.Signal.runSync(Signal.java:253)
	at org.eclipse.net4j.signal.SignalProtocol.startSignal(SignalProtocol.java:431)
	at org.eclipse.net4j.signal.RequestWithConfirmation.doSend(RequestWithConfirmation.java:89)
	at org.eclipse.net4j.signal.RequestWithConfirmation.send(RequestWithConfirmation.java:75)
	at org.eclipse.net4j.signal.RequestWithMonitoring.send(RequestWithMonitoring.java:110)
	at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientProtocol.send(CDOClientProtocol.java:518)
	at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientProtocol.commitDelegation(CDOClientProtocol.java:405)
	at org.eclipse.emf.cdo.internal.server.syncing.SynchronizableRepository$WriteThroughCommitContext.commit(SynchronizableRepository.java:975)
	at org.eclipse.emf.cdo.spi.server.InternalCommitContext$2.runLoop(InternalCommitContext.java:56)
	at org.eclipse.emf.cdo.spi.server.InternalCommitContext$2.runLoop(InternalCommitContext.java:1)
	at org.eclipse.net4j.util.om.monitor.ProgressDistributor.run(ProgressDistributor.java:96)
	at org.eclipse.emf.cdo.internal.server.Repository.commitUnsynced(Repository.java:917)
	at org.eclipse.emf.cdo.internal.server.Repository.commit(Repository.java:910)
	at org.eclipse.emf.cdo.server.internal.net4j.protocol.CommitTransactionIndication.indicatingCommit(CommitTransactionIndication.java:295)
	at org.eclipse.emf.cdo.server.internal.net4j.protocol.CommitTransactionIndication.indicating(CommitTransactionIndication.java:97)
	at org.eclipse.emf.cdo.server.internal.net4j.protocol.CDOServerIndicationWithMonitoring.indicating(CDOServerIndicationWithMonitoring.java:109)
	at org.eclipse.net4j.signal.IndicationWithMonitoring.indicating(IndicationWithMonitoring.java:86)
	at org.eclipse.net4j.signal.IndicationWithResponse.doExtendedInput(IndicationWithResponse.java:92)
	at org.eclipse.net4j.signal.Signal.doInput(Signal.java:328)
	at org.eclipse.net4j.signal.IndicationWithResponse.execute(IndicationWithResponse.java:65)
	at org.eclipse.net4j.signal.IndicationWithMonitoring.execute(IndicationWithMonitoring.java:65)