Program: 169565
Project: 169565
Buggy source:
/** 
 * {@inheritDoc}
 */
@Override public Void beforeCommit(ImprovedTransactionData transactionData) throws DeliberateTransactionRollbackException {
  for (  Node node : transactionData.getAllCreatedNodes()) {
    assignUuid(node);
  }
  for (  Node node : transactionData.getAllDeletedNodes()) {
    uuidIndexer.deleteNodeFromIndex(node);
  }
  for (  Change<Node> change : transactionData.getAllChangedNodes()) {
    if (!change.getCurrent().hasProperty(uuidConfiguration.getUuidProperty())) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteNodeFromIndex(change.getCurrent());
      }
    }
    if (!change.getPrevious().getProperty(uuidConfiguration.getUuidProperty()).equals(change.getCurrent().getProperty(uuidConfiguration.getUuidProperty()))) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteNodeFromIndex(change.getCurrent());
        assignUuid(change.getCurrent());
      }
    }
  }
  for (  Relationship relationship : transactionData.getAllCreatedRelationships()) {
    assignUuid(relationship);
  }
  for (  Relationship rel : transactionData.getAllDeletedRelationships()) {
    uuidIndexer.deleteRelationshipFromIndex(rel);
  }
  for (  Change<Relationship> change : transactionData.getAllChangedRelationships()) {
    if (!change.getCurrent().hasProperty(uuidConfiguration.getUuidProperty())) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteRelationshipFromIndex(change.getCurrent());
      }
    }
    if (!change.getPrevious().getProperty(uuidConfiguration.getUuidProperty()).equals(change.getCurrent().getProperty(uuidConfiguration.getUuidProperty()))) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteRelationshipFromIndex(change.getCurrent());
        assignUuid(change.getCurrent());
      }
    }
  }
  return null;
}

Fixed version (ground truth):
/** 
 * {@inheritDoc}
 */
@Override public Void beforeCommit(ImprovedTransactionData transactionData) throws DeliberateTransactionRollbackException {
  for (  Node node : transactionData.getAllCreatedNodes()) {
    assignUuid(node);
  }
  for (  Node node : transactionData.getAllDeletedNodes()) {
    uuidIndexer.deleteNodeFromIndex(node);
  }
  for (  Change<Node> change : transactionData.getAllChangedNodes()) {
    if (!change.getCurrent().hasProperty(uuidConfiguration.getUuidProperty())) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteNodeFromIndex(change.getCurrent());
        continue;
      }
    }
    if (!change.getPrevious().getProperty(uuidConfiguration.getUuidProperty()).equals(change.getCurrent().getProperty(uuidConfiguration.getUuidProperty()))) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteNodeFromIndex(change.getCurrent());
        assignUuid(change.getCurrent());
      }
    }
  }
  for (  Relationship relationship : transactionData.getAllCreatedRelationships()) {
    assignUuid(relationship);
  }
  for (  Relationship rel : transactionData.getAllDeletedRelationships()) {
    uuidIndexer.deleteRelationshipFromIndex(rel);
  }
  for (  Change<Relationship> change : transactionData.getAllChangedRelationships()) {
    if (!change.getCurrent().hasProperty(uuidConfiguration.getUuidProperty())) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteRelationshipFromIndex(change.getCurrent());
        continue;
      }
    }
    if (!change.getPrevious().getProperty(uuidConfiguration.getUuidProperty()).equals(change.getCurrent().getProperty(uuidConfiguration.getUuidProperty()))) {
      if (isImmutable()) {
        throw new DeliberateTransactionRollbackException("String_Node_Str" + uuidConfiguration.getUuidProperty() + "String_Node_Str");
      }
 else {
        uuidIndexer.deleteRelationshipFromIndex(change.getCurrent());
        assignUuid(change.getCurrent());
      }
    }
  }
  return null;
}