I'm little confuse that if my project is on Spring and I want to use neo4j with java not with Spring Data .
what is a good practice ?
Thanks
You have another options for your Java app. I assume you are talking about client application, not about extension for Neo4j.
One option is to use REST API from your application. As a client you can use Jersey client and another REST client, which you like.
Another option is to use OGM, which is Object Graph Mapping Library, like Hibernate for rdbms. https://github.com/neo4j/neo4j-ogm
OGM for Neo4j is now separated from Spring : https://github.com/neo4j/neo4j-ogm. So you don't have to use Spring Data and can still use OGM (or even stick with Core Java API if you want). But Spring Data has some nice features (i.e. repositories) so if I were you I would give it a try.
If you're using spring, best practice would probably be to use spring-data-neo4j, because its integration with the rest of spring is quite nice. That being said, of course you don't have to. You have the options listed by others, and of course you can use the native Java API.
If you've already taken the step to use spring, in general I'd recommend using spring-data-neo4j unless you have a compelling specific requirement not to.
Related
I'm starting a new Spring boot project and I've chosen a neo4j graph database as there is a lot of connected data.
I would like to use Reactive Streams in the project as there is a lot of push notifications from the server to the client. I'm looking at using Spring Webflux for this reason.
I'm weary of accidentally using blocking calls/api's that will negate the decision to use webflux.
I've searched for information on using neo4j with reactive streams. It doesn't look like there is a reactive driver at the moment, although there is an asynchronous mechanism using CompletableFuture.
Please could I have some guidance on how to fit these two peices, webflux & neo4j, together.
thanks
I'm working on a webapp running on Tomcat which using spring-data to connect to a neo4j graph in embedded mode.
I would like to use neo4j server instead of the embedded mode and I am looking for some help to be sure about how to do that.
Some of my application services are quite difficult and combine, in a single transaction, the result of several cypher requests in a dto sent back to the user.
First I thought that I have to create a server unmanaged extension and I think I should follow these following steps.
- Keep my webapp with springMVC and spring security to hold and secure users sessions.
- Regroup all my transactional services in a specific jar my-app.jar
- Use Jax-RS to add a REST access point on each of my service of my-app.jar
- use something like spring restTemplate from my spring controller to call services from my-app.jar
First question : is this way of doing things is the good way ?
Second question : I have many spring injection in my services layer. How can I keep them working (how can I add dependencies in the server extension ?
Then I discovered graphAware and I wonder if I should use it instead.
And finally I just read this post http://jexp.de/blog/2014/12/spring-data-neo4j-improving-remoting-performance/ and it seems that I should use
the SpringCypherRestGraphDatabase (as explain in the bold text at the end of the article).
Well, I'm a little bit lost and I would appreciate any help to use neo4j server instead the embedded mode for my application which contain some complexe transactions.
You have a number of options here and you are on the right track with your thinking.
Option 1:
If your use cases are business-logic-heavy, and your question suggests that they are, going the unmanaged extension route is one option.
Essentially, you can then combine the most performant Java API and Cypher (if you wish) to perform your use case. I wouldn't use SDN here by the way, so you have to do your mapping manually, but is there really any mapping? Maybe you just want to execute traversals / Cypher queries for each one of your use cases.
Each use case then exposes a simple REST API, which is consumed by your Spring-powered application running Spring MVC, Spring Security, and all that. You can use the RestTemplate from Spring in your app's Controllers.
To add a twist to all that, you can use the GraphAware Framework to develop the "unmanaged extension" using Spring MVC as well. That would be my preferred option, knowing nothing about your domain/app.
Option 2:
Use the new version of SDN (v4) as Michael suggests. This allows you to run your application with annotated domain objects, Spring MVC, Security, et al. Operations (CRUD and other) are automatically translated to Cypher and sent across the wire to Neo4j running in server mode (no extensions needed). Results are then marshalled back to Java objects.
We're about to release Milestone 1 of SDN v4. It shouldn't take more than a week. That said, it is still going to be a Milestone release, thus not ready for production. A GA release is expected in May (ish).
You can already try SDN v4 yourself. Clone this repo: https://github.com/spring-projects/spring-data-neo4j, make sure you're on the 4.0 branch, and do an mvn clean install on it. Here's a sample app, built using Angular JS and Spring Boot.
Please do get in touch with feedback / questions / problems (best by email info at graphaware dot com). Cheers!
I suggest you wait a bit until SDN4 Milestone 1 comes out (developed by GraphAware) this was written from scratch for Neo4j-Server.
I am in an early stage of a small Spring-based project which utilizes Spring Data Neo4j with an embedded database (but possibly could use a server instance in a later development , too).
My data model and relationships have been designed, Spring Security (with Neo4j), MVC and tiles are set up and also seem to be fully functional.
Now I have the additional requirement to allow login with social networks.
I'm really stuck with trying to integrate Spring Social with my above mentioned setup. Basically I have a rough idea that I need to make use of the cross-store Neo4j component but have no real clue, how I could start with it.
I tried to find something useful for my case (SDN Neo4j + Spring Social Security) on github but was not really successful with that either.
Can anyone provide me an example configuration or even point me to some examples (I obviously didn't find before) ... any help is highly appreciated.
I don't think there is a Spring Social connector yet, but it shouldn't be too hard to write (there is one for Mongo). If nothing else, you can use the https://code.google.com/p/google-api-java-client/ directly form a service, exposing the google oauth callback from a Spring Controller, should work too.
https://code.google.com/p/google-api-java-client/
Neo4j connection repository for Spring social has been implemented here using neo4j-ogm. You can reuse that. https://github.com/maciossek/spring-social-neo4j
I am trying to use the Spring Security Core plugin in a Grails project using the Neo4j GORM plugin.
As far as I can see I have two options:
Use the Spring Security Core plugin as is and persist it's data to say MySQL while using Neo4j for the rest of the application data.
Use a custom UserDetailsService.
Does anyone have an example of the latter?
pjdv
You mean like the one in the documentation? http://grails-plugins.github.com/grails-spring-security-core/docs/manual/guide/11%20Custom%20UserDetailsService.html
Since the Neo4j plugin is GORM compliant, spring-security-core's GormUserDetailsService should work out of the box.
I'm looking at leveraging an existing Microsoft SQL Server Analysis Service (SSAS) instance for a reporting project. The goal is to have the data compiled in SSAS, then a web front-end that allows the user change time-periods, while building graphics (using D3 or the like).
Google has not been my friend in finding a solution for this...
Is there a gem or other way to connect SSAS to a Rails front-end?
Thanks
JSON, no, not that I know of. However if you are willing to use XML, then yes. XMLA (documented here) is the client API language for SSAS.
One approach would be to build a web service with .NET, and then have your Rails front-end call the web service.
I suppose you could use XMLA directly, but it's painful.