Program: 11320
Project: 11320
Buggy source:
protected final <T extends Item>void deleteUniqueConstraintIndexes(final T item,final ItemConfiguration itemConfiguration,final Collection<PropertyDescriptor> constraintPropertyDescriptors){
  if (constraintPropertyDescriptors.isEmpty()) {
    return;
  }
  for (  final UniqueConstraint uniqueConstraint : itemConfiguration.uniqueConstraints()) {
    final String uniqueConstraintPropertyName=uniqueConstraint.propertyName();
    final PropertyDescriptor uniqueConstraintPropertyDescriptor=uniqueConstraint.propertyDescriptor();
    if (constraintPropertyDescriptors.contains(uniqueConstraintPropertyDescriptor)) {
      final AttributeValue uniqueConstraintAttributeValue=DynamoDbPropertyMarshaller.getValue(item,uniqueConstraintPropertyDescriptor);
      if (uniqueConstraintAttributeValue.getS() != null) {
        uniqueConstraintAttributeValue.setS(uniqueConstraintAttributeValue.getS().toUpperCase());
      }
      final Map<String,AttributeValue> key=new HashMap<>();
      key.put("String_Node_Str",new AttributeValue(uniqueConstraintPropertyName));
      key.put("String_Node_Str",uniqueConstraintAttributeValue);
      final String indexTableName=databaseSchemaHolder.schemaName() + "String_Node_Str" + itemConfiguration.tableName();
      final DeleteItemRequest itemRequest=new DeleteItemRequest().withTableName(indexTableName).withKey(key);
      try {
        amazonDynamoDbClient.deleteItem(itemRequest);
      }
 catch (      final AmazonServiceException e) {
        throw new PersistenceResourceFailureException("String_Node_Str",e);
      }
    }
  }
}

Fixed version (ground truth):
protected final <T extends Item>void deleteUniqueConstraintIndexes(final T item,final ItemConfiguration itemConfiguration,final Collection<PropertyDescriptor> constraintPropertyDescriptors){
  if (constraintPropertyDescriptors.isEmpty()) {
    return;
  }
  for (  final UniqueConstraint uniqueConstraint : itemConfiguration.uniqueConstraints()) {
    final String uniqueConstraintPropertyName=uniqueConstraint.propertyName();
    final PropertyDescriptor uniqueConstraintPropertyDescriptor=uniqueConstraint.propertyDescriptor();
    if (constraintPropertyDescriptors.contains(uniqueConstraintPropertyDescriptor)) {
      final AttributeValue uniqueConstraintAttributeValue=DynamoDbPropertyMarshaller.getValue(item,uniqueConstraintPropertyDescriptor);
      if (uniqueConstraintAttributeValue != null) {
        if (uniqueConstraintAttributeValue.getS() != null) {
          uniqueConstraintAttributeValue.setS(uniqueConstraintAttributeValue.getS().toUpperCase());
        }
        final Map<String,AttributeValue> key=new HashMap<>();
        key.put("String_Node_Str",new AttributeValue(uniqueConstraintPropertyName));
        key.put("String_Node_Str",uniqueConstraintAttributeValue);
        final String indexTableName=databaseSchemaHolder.schemaName() + "String_Node_Str" + itemConfiguration.tableName();
        final DeleteItemRequest itemRequest=new DeleteItemRequest().withTableName(indexTableName).withKey(key);
        try {
          amazonDynamoDbClient.deleteItem(itemRequest);
        }
 catch (        final AmazonServiceException e) {
          throw new PersistenceResourceFailureException("String_Node_Str",e);
        }
      }
    }
  }
}