/**
 * END USER LICENSE AGREEMENT (“EULA”)
 *
 * READ THIS AGREEMENT CAREFULLY (date: 9/13/2011):
 * http://www.akiban.com/licensing/20110913
 *
 * BY INSTALLING OR USING ALL OR ANY PORTION OF THE SOFTWARE, YOU ARE ACCEPTING
 * ALL OF THE TERMS AND CONDITIONS OF THIS AGREEMENT. YOU AGREE THAT THIS
 * AGREEMENT IS ENFORCEABLE LIKE ANY WRITTEN AGREEMENT SIGNED BY YOU.
 *
 * IF YOU HAVE PAID A LICENSE FEE FOR USE OF THE SOFTWARE AND DO NOT AGREE TO
 * THESE TERMS, YOU MAY RETURN THE SOFTWARE FOR A FULL REFUND PROVIDED YOU (A) DO
 * NOT USE THE SOFTWARE AND (B) RETURN THE SOFTWARE WITHIN THIRTY (30) DAYS OF
 * YOUR INITIAL PURCHASE.
 *
 * IF YOU WISH TO USE THE SOFTWARE AS AN EMPLOYEE, CONTRACTOR, OR AGENT OF A
 * CORPORATION, PARTNERSHIP OR SIMILAR ENTITY, THEN YOU MUST BE AUTHORIZED TO SIGN
 * FOR AND BIND THE ENTITY IN ORDER TO ACCEPT THE TERMS OF THIS AGREEMENT. THE
 * LICENSES GRANTED UNDER THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON ACCEPTANCE
 * BY SUCH AUTHORIZED PERSONNEL.
 *
 * IF YOU HAVE ENTERED INTO A SEPARATE WRITTEN LICENSE AGREEMENT WITH AKIBAN FOR
 * USE OF THE SOFTWARE, THE TERMS AND CONDITIONS OF SUCH OTHER AGREEMENT SHALL
 * PREVAIL OVER ANY CONFLICTING TERMS OR CONDITIONS IN THIS AGREEMENT.
 */

package com.akiban.ais.model.validation;

import com.akiban.ais.model.AkibanInformationSchema;
import com.akiban.ais.model.Group;
import com.akiban.ais.model.UserTable;
import com.akiban.server.error.GroupMixedTableTypes;

/**
 * Validates that groups do not mix memory tables and Storage tables in the same group.
 * @author tjoneslo
 *
 */
public class MemoryTablesNotMixed implements AISValidation {
    
    @Override
    public void validate(AkibanInformationSchema ais, AISValidationOutput output) {
        for (Group group : ais.getGroups().values()) {
            validateGroup (ais, group, output);
        }
    }

    private void validateGroup (AkibanInformationSchema ais, Group group, AISValidationOutput output) {
        boolean rootMemoryTable = group.getGroupTable().getRoot().hasMemoryTableFactory();
        for (UserTable userTable : ais.getUserTables().values()) {
            if (userTable.getGroup() == group &&
                    userTable.hasMemoryTableFactory() != rootMemoryTable) {
                output.reportFailure(new AISValidationFailure (
                        new GroupMixedTableTypes(group.getName(), rootMemoryTable, userTable.getName())));
            }
        }
    }
}
@@ -1969,26 +1969,22 @@
     
-boolean rootMemory
+UserTable root
 Tabl
@@ -2018,16 +2018,143 @@
 etRoot()
+;%0A        if(rootTable == null) %7B%0A            return; // Caught elsewhere%0A        %7D%0A        boolean rootMemoryTable = rootTable
 .hasMemo

Add null table test check to avoid NPE (which is checked elsewhere)