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.
Related
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.
I am working on a project where we have a very slim server (Linux, Nginx, Sqlite), but our web application shall not show any signs of shortcomings (should contain charts, dashboards, nice looking controls) – so I need the client to do all the heavy work.
I assume that BreezeJS would be good in this case, because it manages data on the client, in a way that reduces workload on the server. The server only sends the data to the client and at some point gets data back that has to be saved to the database. All caching and other stuff is managed on the client.
I assume AngularJS would also be good in this case, because it is a client-side MVC-framework, again reducing workload on the server. It also works seamlessly together with BreezeJS.
I assume Wijmo would also be good in this case, because it provides nice looking controls and also works seamlessly together with BreezeJS and AngularJS.
Are my assumptions right? Any comments?
My only concerns are how I get BreezeJS to “talk” with the Linux-server (Nginx, Sqlite). Are there any samples regarding this? Is anyone working on something similar?
We will be releasing a NodeJS/Express/Mongo example within the next few weeks that should show how to communicate with an arbitrary non-.NET backend. (also see the current 'Edmunds' example in the Breeze zip). But we don't have anything yet that explicity shows Breeze working with a Linux backend. Please vote for this here: Breeze User Voice
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 started with Spring and Spring ROO as job switched with no past experience in Java Development. From last 1.5 year experience doing development in Ruby on Rails. So my new company want me to work with Spring and Spring ROO no Grails/Groovy:(. As no past experience in JAVA DEVELOPMENT struggling a lot with understanding of configuration of XML and Annotation support. Although i covered basics of but Now i was looking to find a way that Spring have such support of Ajax call CRUD operations of entities or Javascript call to execute script which i get as result of remote true URL click. As Rails framework (rails.js).
Hopefuly the person who work with ROR and Spring ROO may be best person to answer my question. Thanks in Advance.
To implement CRUD operations, I may suggest you to use REST service. It is easy to create with Spring MVC.
Spring blog
Good example
Another fast example
And ofcourse Spring documentation
This is copied part of my previous answer :
My advice to you would be to download the spring source(eclipse like IDE) :
http://www.springsource.org/springsource-tool-suite-download
After downloading it you can simply go to File > New > Spring Template Project > Spring MVC project
After you're done with creating project, the working template project(structured project, example controller file, example view, pom.xml etc.) will be created for you. You can just build it and deploy it to tomcat or whatever.
Btw. check this out :
https://github.com/SpringSource/spring-mvc-showcase/blob/master/MasteringSpringMVC3.pdf?raw=true
It is enough to get you started well off with Spring MVC.
I once had the same problem to you (I used to develope Groovy/Grails, then switch to Spring MVC). Unfortunately, I don't think there's an easy way to make what you ask in Spring. Spring doesn't have much productivity-enhanced functions,but it enables flexibility instead.
In short, you will be able to do Ajax, but with a lot more manual configuration (pure html/javascript-jQuery and java code) - like in Vacuum answer.
Jquery ajax might be the best solution you can find though it only help you send the the CRUD requests to server side. You must write java code at server to process those requests.
A Rails 3 application running on Postgresql needs to switch to a graph database to be able to grow up. There are many of them and they all offer different kind of API, REST mostly.
I am highly inspired by talks of Emil Eifrem, CEO of NeoTechnologies, about what can be accomplished with Neo4j. I must confess, I've played with it and this thing is absolutely what we need, but there are several obstacles.
REST API is not transactional.
Rails 3 apps are running on ruby 1.9.2, but not jRuby 1.5.3 or 1.6 to achieve native API.
Some databases are also driven by Java and offer REST API, so taking them changes nothing. Someother are not an option for us because of a license or a cost or a lack of team behind them.
I assume I'm missing something, so would appreciate any tip, insight or advice about what are our options and and what can play well for us. Thanks.
You can run Neo4jrb with Rails 3 on jruby 1.6, so that should not be a problem.
To run a transactional (REST) API on top of that you can easily write your own Neo4j-Server plugin/extension that could also use Neo4jrb internally but exposes an API that fits your domain and is less verbose/chatty than the fine grained Neo4j-Server REST API. This should also be easier to consume for your clients as it talks in your terms, vocabulary and use-cases.
We're currently working on creating a generic (j)ruby server extension that is able to consume posted code and make it available as new REST endpoints.