velocypack | A fast and compact format for serialization and storage | Serialization library

In use-cases where it makes sense to store binary data in the database rather than on the filesystem, how should that be done with ArangoDB versions 3.3 or higher? I anticipate using Foxx, but I am open to other alternatives if there are any.

This topic was discussed three years prior but Arango has made signtificant changes to its internal data storage technology since then. In particular, ArangoDB now uses VelocyPack, described here:

GitHub - arangodb/velocypack: A fast and compact format for serialization and storage

VPack is said to "cover all of JSON data types, plus dates, integers, binary data and arbitrary precision numbers."

The previously accepted answer stated, "Storing binary data inside ArangoDB has been a long standing feature request. Currently its not possible out of the box."

If I understand VPack correctly, it seems that answer is now incorrect. Hence the presumed need for a new question.

After reading about File access in Foxx in the ArangoDB manual here, coupled with reading about VPack and not having any experience with these things, I'm not sure what approach to take.

An alternative is to store images on the filesystem as described here:

Handling Binary Data in Foxx 3.0 - J@ArangoDB

However, as the ArangoDB manual states,

ArangoDB is primarily a database. In most cases the best place to store data is therefore inside the database, not on the file system.

I'm using SpringBoot 1.5.4.RELEASE, ArangoDB java driver 4.5.0, Arango Spring Data 1.1.5

I'm getting this error when retrieving an object.

I'm starting to use ArangoDB as the persistence layer for an existing java SpringBoot (and SpringData) application. There are many DTOs, all of which are immutable classes (using AutoValue).

There is, therefore, no default constructor, and arango is unable to instanatiate the dto in order to populate it from the DB.

Is it possible to have the arango spring data layer use the Builder as the way to instantiate and populate the class (ie during deserialization)

It is possible to have jackson use the dto's builder when unnarshalling from json, so as a fallback option, is it possible to configure arango/java/springdata to use jackson/json instead of velocypack ??

with thanks, Simon

update1

Thanks for the quick answer. One of the complications I am facing is with autovalue, the generated constructor will be private if there is a builder. I can take out the generated builder, and will get a package protected constructor, however I am also seeing this ...

Trying to play with new ArangoSearch features I found out that "arangod" crashes, "Segmentation fault". This happens in two cases:

1. Collection has already have an "arangosearch" view and I try to upload data by API;
2. If data are already loaded, the attempt to create a view gives same result, "Segmentation fault".

I made a stack trace by GDB:

I have a simple collection of "Book" and "Information" connected by the edge of "InformationOf".

I am trying to write a couple of wrapper functions for the code here

it basically has the form (as given in the example page) of

I am using ArangoDB 3.1.23 and the ArangoDB Java driver 4.2.2. I am using Eclipse and Maven. I am having troubles to read documents as Java classes, as it is explained here. I followed the tutorial, and wrote the following test code.

As you can see, reading documents as BaseDocument or VelocyPack works, but reading them as Java classes returns a null.

I'm using ArangoDB 3.1, with the Java Driver 4.1.10.

This version is using Velocypack.

I'm trying to deserialize / unmarshall a list of an object (Item) where there are various subclasses (eg SimpleItem, ComplexItem) that might be in that list. ie it's a polymorphic list.

Serialising is fine, the full object is correctly persisted, with all attributes, for all Item based classes.

Deserialising is not so great, only the attributes that are declared in Item are populated in the new Java Object.

I know that for jackson and gson, there are methods available for managing deserialisation/unmarshalling polymorphic lists from json. eg, adding a _class attribute with the fully qualified java class in the json.

My question is, how can this be done with velocypack?

thanks, Simon