private Configuration baseConfig(boolean useLogFile) {
   Config4Impl config = (Config4Impl) Db4o.newConfiguration();
   config.objectClass(CrashData.class).objectField("_name").indexed(true);
   config.reflectWith(Platform4.reflectorForType(CrashSimulatingTestCase.class));
   config.bTreeNodeSize(4);
   config.lockDatabaseFile(false);
   config.fileBasedTransactionLog(useLogFile);
   ID_SYSTEM.value().configure(config);
   FREESPACE_MANAGER.value().configure(config);
   return config;
 }
 public void lockDatabaseFile(boolean flag) {
   _config.lockDatabaseFile(flag);
 }