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diff --git a/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/SessionImplVirtual.java b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/SessionImplVirtual.java
new file mode 100644
index 000000000..1a109d2e0
--- /dev/null
+++ b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/SessionImplVirtual.java
@@ -0,0 +1,115 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package fi.vtt.simantics.procore.internal;
+
+import java.io.IOException;
+
+import org.simantics.db.ServerI;
+import org.simantics.db.VirtualGraph;
+import org.simantics.db.authentication.UserAuthenticationAgent;
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.exception.InvalidAuthenticationException;
+import org.simantics.db.exception.InvalidUserException;
+import org.simantics.db.impl.ResourceImpl;
+import org.simantics.db.impl.VirtualGraphImpl;
+import org.simantics.db.impl.query.QueryProcessor;
+import org.simantics.db.service.ServerInformation;
+
+import fi.vtt.simantics.procore.BackdoorAuthenticator;
+import fi.vtt.simantics.procore.ProCoreServerReference;
+import fi.vtt.simantics.procore.ProCoreSessionReference;
+import fi.vtt.simantics.procore.SessionManagerSource;
+
+public class SessionImplVirtual extends SessionImplSocket {
+    protected VirtualGraphImpl virtualGraphImpl;
+    public SessionImplVirtual(UserAuthenticationAgent authAgent)
+    throws DatabaseException {
+        super(null, authAgent);
+        init(authAgent, false);
+    }
+    public SessionImplVirtual(UserAuthenticationAgent authAgent, boolean init)
+    throws DatabaseException {
+        super(null, authAgent);
+        init(authAgent, init);
+    }
+    private void init(UserAuthenticationAgent authAgent, boolean init)
+    throws DatabaseException {
+        ProCoreServerReference serverReference = new ProCoreServerReference();
+        ProCoreSessionReference sessionReference = new ProCoreSessionReference(serverReference, SessionManagerSource.NullSessionId);
+        if (init)
+            graphSession = new GraphSessionVirtualInit(this, sessionReference, virtualGraphServerSupport);
+        else
+            graphSession = new GraphSessionVirtual(this, sessionReference, virtualGraphServerSupport);
+        // This is used by QueryProcessor among others.
+        String databaseId = GraphSessionVirtual.serverInfo.databaseId;
+        String serverId = GraphSessionVirtual.serverInfo.serverId;
+        virtualGraphServerSupport.connect(databaseId + "." + serverId);
+        virtualGraphImpl = (VirtualGraphImpl)virtualGraphServerSupport.getWorkspacePersistent("virtualGraph" + "." + serverId);
+        try {
+            requestManager = new SessionRequestManager(this, state);
+            clusterStream = new ClusterStream(this, graphSession, true);
+            clusterTranslator = new ClusterTranslatorImpl(this);
+            writeSupport = new WriteSupportImpl(this);
+            resourceSupport = new ResourceSupportImpl(this);
+            querySupport = new QuerySupportImpl(this, clusterTranslator, new SerialisationSupportImpl(this), requestManager);
+            queryProvider2 = new QueryProcessor(getAmountOfQueryThreads(), querySupport, sessionThreads);
+            state.setGraphSession(this, graphSession, queryProvider2, clusterTable);
+            ServerInformationImpl serverInfo = graphSession.getServerInformation();
+            authenticator = authAgent.getAuthenticator(serverInfo);
+            if (authenticator == null)
+                throw new InvalidAuthenticationException("Authentication agent did not provide an authenticator");
+            if (authenticator instanceof BackdoorAuthenticator)
+                user = authenticator.getUser(this);
+        } catch (InvalidAuthenticationException e) {
+            throw e;
+        } catch (InvalidUserException e) {
+            throw e;
+        } catch (IOException e) {
+        	Logger.defaultLogError("I/O error. See exception for details.", e);
+            graphSession = null;
+            throw new DatabaseException(e);
+        } catch (Throwable e) {
+            e.printStackTrace();
+            Logger.defaultLogError("Unhandled error. See exception for details.", e);
+            graphSession = null;
+            throw new DatabaseException(e);
+        }
+        this.clusterStream.setOff(true);
+    }
+    public static ServerI newVirtualProCoreServer() {
+        if (DEBUG)
+            System.out.println("SessionImplVirtual.newVirtualProCoreServer");
+        return new VirtualServer();
+    }
+    @Override
+    protected VirtualGraph getProvider(VirtualGraph vg) {
+        return null != vg ? vg : virtualGraphImpl;
+    }
+    @Override
+    protected ResourceImpl getNewResource() throws DatabaseException {
+        int newId = virtualGraphImpl.newResource(false);
+        return new ResourceImpl(resourceSupport, newId);
+    }
+    @Override
+    protected ServerInformation getCachedServerInformation() {
+        GraphSession gs = graphSession;
+        if (null == gs)
+            return null;
+        try {
+            return gs.getServerInformation();
+        } catch (DatabaseException e) {
+            Logger.defaultLogError("Failed to get server info.", e);
+            return null;
+        }
+    }
+}