Spring-Data-Neo4j and Neo4j 2.2.0

[Liliana Ziolek]

Hi

Does anybody know what is the current state / progress of making SDN compatible with Neo4j 2.2.0 - in other words of what is the ETA of at least runnable version (can be snapshot/nightly build or whatever)?

I recently downloaded 2.2.0-M03 and tried running it with snapshot of SDN 3.3.0 but it crashes with:

java.lang.IllegalStateException: Failed to load ApplicationContext

[...]

Caused by: java.lang.NoClassDefFoundError: org/neo4j/kernel/impl/transaction/SpringTransactionManager

at org.springframework.data.neo4j.config.JtaTransactionManagerFactoryBean.createTransactionManagerForOnePointEight(JtaTransactionManagerFactoryBean.java:123)

at org.springframework.data.neo4j.config.JtaTransactionManagerFactoryBean.createJtaTransactionManager(JtaTransactionManagerFactoryBean.java:104)

[...]

From what I can see, SpringTransactionManager class doesn't exist in 2.2.0 at all (it was there up until 2.1.6) which makes me think that SDN 3.3.0 is only meant to work with Neo4j 2.1.x.

Does anybody know anything about current progress (or lack of it) with porting SDN to Neo 2.2 ? I had a quick look at Github but couldn't find an obvious branch or anything.

Also, as a more general question. What is the official SDN status - i.e. is it considered part of Neo4j suite, supported and maintained by Neo Technology, or is it more of open source/community effort and no expectations should ever be placed on its availability? In other words, can paying Enterprise customers expect similar kind of support for it as for the main Neo4j (including that once Neo4j database goes out of milestones, there will be SDN available that actually works with it), or is it a separate product and it just happens that some people closely connected to Neo work on it as well?

I don't mean this question in any negative way - I just need to set up my expectations and decide if using SDN is worth the potential delays in being able to upgrade Neo4j when new versions come out.

Oh, and perhaps it is worth considering some more obvious versioning scheme, or at least providing a compatibility matrix on the page so that it's clear which version of SDN goes with which version(s) of Neo4j :)

Thanks

Liliana

[Michael Hunger]

Hi Liliana,

thanks for your question.

So far SDN is incompatible with Neo 2.2 as the latter removed JTA, so we will have to implement a SDN side transaction manager, which I haven't gotten around to but hope to get done soon.

Also there are efforts underway for a complete rewrite of SDN built on a new  Java OGM from scratch by our friends at GraphAware sponsored by Neo Technology. We will announce publicly when the first milestone is available for testing.

That new implementation will (first) solely focus on high performance interactions with Neo4j server.

Cheers, Michael

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[Liliana Ziolek]

Hi Michael

Are you aware of any other incompatibilities with Neo4j 2.2 except for the lack of JTA? Since I only need it for some prototyping at the moment I might give it a go to implement something VERY simple just to get it going. But if there are 10 other issues then I think I'll either downgrade or cut out SDN for now :)

I have heard that there is some new exciting stuff coming in SDN, including better handling of REST-based access - definitely looking forward to it. I can totally understand that there is only so much you guys can do and things are moving quickly - just wanted to know where we stand.

Cheers

Lili

[Michael Hunger]

Hi Liliana,

Good question, I was about to update it and write the TX-Manager but had other things that distracted me.

Perhaps I find time this week to finish it up.

I can't think of any other issues that should come up. 

If you use it remotely it should actually work, only not 100% as fast as embedded but should work without changes with the latest SDN milestone.

You can also try the super new stuff that is to be SDN 4.x, see http://github.com/neo4j-contrib/neo4j-ogm, You'll have to build it locally though.

HTH,

Cheers,

Michael

[Liliana Ziolek]

I have used it embedded so far, had a bit of a break (was busy and it's mostly a pet project) and now tried upgrading to the latest stack. I could theoretically switch to remote access but I think eventually I'll need it running as an extension (there'll be too much data to transfer) so probably best not to start messing around with my project ;)

Is the ogm project private by any chance? I can't see it...

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