= Neo4j-GraphQL Extension :img: docs/img :branch: 3.5


[NOTE] The plugin is considered end-of-life. It will not be updated for Neo4j 4.0, we recommend to move a middleware based solution using neo4j-graphql-js or neo4j-graphql-java. After a lot of feedback we think separating the GraphQL API from the core database is the better architectural setup.

This is a GraphQL-Endpoint extension for Neo4j. It is part of the https://grandstack.io[GRANDstack^]

This readme assumes you are somewhat familiar with http://graphql.org/[GraphQL^] and minimally with http://neo4j.com/developer/cypher[Cypher].

Based on your GraphQL schema, it translates GraphQL Queries and Mutations into Cypher statements and executes them on Neo4j.

It offers both an HTTP API, as well as, Neo4j Cypher Procedures to execute and manage your GraphQL API.

== Installation

Download and install http://neo4j.com/download[Neo4j Desktop^]

Neo4j Desktop provides a quick install button for neo4j-graphql.

After creating your database you can find it under "Manage" in the "Plugins" tab for a single click install.


=== Use with neo4j-graphql-cli

This extension is utilized, when you use https://www.npmjs.com/package/neo4j-graphql-cli[`neo4j-graphql-cli`^]

This tool

  1. launches a http://neo4j.com/sandbox[Neo4j Sandbox] with your GraphQL schema
  2. provides the /graphql/ endpoint,
  3. a Neo4j server,
  4. an hosted GraphiQL for it.

npm install -g neo4j-graphql-cli neo4j-graphql movies-schema.graphql

== Quickstart

To generate some graph data in Neo4j just run http://localhost:7474/browser?cmd=play&arg=movie%20graph[`:play movie graph`^] in your Neo4j Browser.

=== GraphiQL

The best tool to use is https://electronjs.org/apps/graphiql[GraphiQL^] the GraphQL UI. Get and install it.

Enter your GraphQL URL, like +http://localhost:7474/graphql/+ (note the trailing slash).

If your Neo4j Server runs with authentication enabled, add the appropriate Basic-Auth (https://www.base64encode.org/[base64 encoded^]) username:password header in the "Edit HTTP Headers" screen.

.Command to generate the Authorization header value.

echo "Basic $(echo -n "neo4j:" | base64)"

=== Uploading a GraphQL Schema

Here is a small example schema for the movie data. Just a Movie with actors, and a Person with movies.

Simple properties are mapped directly while the relationships are mapped to fields movies and actors

.Movies Schema [source,graphql]

type Movie { title: String! released: Int actors: [Person] @relation(name:"ACTED_IN",direction:IN) } type Person { name: String! born: Int movies: [Movie] @relation(name:"ACTED_IN") }

You can POST a GraphQL schema to the /graphql/idl/ endpoint or run the CALL graphql.idl('schema-text') procedure.

The payload is parsed and stored in Neo4j and used subsequently as the backing GraphQL schema for validating and executing queries.


CALL graphql.idl(' type Movie { title: String! released: Int tagline: String actors: [Person] @relation(name:"ACTED_IN",direction:IN) } type Person { name: String! born: Int movies: [Movie] @relation(name:"ACTED_IN") } ')

You should then be able to see your schema in the Docs section of GraphiQL.

This also gives you auto-completion, validation and hints when writing queries.

With graphql.reset() you can trigger the reset of you schema. But it also updates automatically if changed on other cluster members. Latest after 10 seconds.

To visualize your GraphQL schema in Neo4j Browser use: call graphql.schema().



RETURN graphql.getIdl()

you'll get back a string representation of the currently used schema.

=== Auto-Generated Query Types

From that schema, the plugin automatically generate Query Types for each of the declared types.

e.g. Movie(title,released,first,offset,_id,orderBy, filter): [User]

Now you can for instance run this query:

.Simple query example [source,graphql]

{ Person(name:"Kevin Bacon") { name born movies { title released tagline } } }


.Advanced query example [source,graphql]

query Nineties($released: Int, $letter: String) { Movie(released: $released, filter: {title_starts_with: $letter, actors_some: { name_contains: $letter}}) { title released actors(first: 3) { name born movies(first: 1, orderBy: title_desc) { title released } } } }

query variables

{ "released":1995, "letter":"A"}

This query declares query name and parameters (first line), which are passed separately ("Query Parameters box") as JSON.

And get this result:


=== Auto-Generated Mutations

Additionally Mutations for each type are created, which return update statistics.

e.g. for the Movie type:

  • createMovie(title: ID!, released: Int) : String
  • mergeMovie(title: ID!, released: Int) : String
  • updateMovie(title: ID!, released: Int) : String
  • deleteMovie(title: ID!) : String

and for it's relationships:

  • addMovieActors(title: ID!, actors:[ID]!) : String
  • deleteMovieActors(title: ID!, actors:[ID]!) : String

Those mutations then allow you to create and update your data with GraphQL.

.Single Mutation [source,graphql]

mutation { createPerson(name:"Chadwick Boseman", born: 1977) }

.Mutation Result [source,json]

{ "data": { "createPerson": "Nodes created: 1\nProperties set: 2\nLabels added: 1\n" } }

.Several Mutations at once [source,graphql]

mutation { pp: createMovie(title:"Black Panther", released: 2018) lw: createPerson(name:"Letitia Wright", born: 1993) cast: addMovieActors(title: "Black Panther", actors:["Chadwick Boseman","Letitia Wright"]) }

If multiple mutations are sent as part of the same request, they will be executed in the same transaction (meaning if one of them fails they will all fail). If the same mutation is called multiple times, you need to use alias prefixes to avoid clashes in the returned data, which is keyed on mutation names.


You can use those mutations also to https://medium.com/@mesirii/better-data-import-with-graphql-548084a35dfd[load data from CSV or JSON^].

=== Directives

Directives like @directiveName(param:value) can be used to augment the schema with additional meta-information that we use for processing.

You have already seen the @relation(name:"ACTED_IN", direction:"IN") directive to map entity references to graph relationships.

The @cypher directive is a powerful way of declaring computed fields, query types and mutations with a Cypher statement.

.For instance, directors [source,graphql]

type Movie { ... directors: [Person] @cypher(statement:"MATCH (this)<-[:DIRECTED]-(d) RETURN d") }

.Register Top-Level Schema Types [source,graphql]

schema { query: QueryType mutation: MutationType }

.A custom query [source,graphql]

type QueryType { ... coActors(name:ID!): [Person] @cypher(statement:"MATCH (p:Person {name:$name})-[:ACTED_IN]->()<-[:ACTED_IN]-(co) RETURN distinct co") }

.A custom mutation [source,graphql]

type MutationType { ... rateMovie(user:ID!, movie:ID!, rating:Int!): Int @cypher(statement:"MATCH (p:Person {name:$user}),(m:Movie {title:$movie}) MERGE (p)-[r:RATED]->(m) SET r.rating=$rating RETURN r.rating") }

.Full enhanced Schema [source,graphql]

type Movie { title: String! released: Int actors: [Person] @relation(name:"ACTED_IN",direction:IN) directors: [Person] @cypher(statement:"MATCH (this)<-[:DIRECTED]-(d) RETURN d") } type Person { name: String! born: Int movies: [Movie] @relation(name:"ACTED_IN") } schema { query: QueryType mutation: MutationType } type QueryType { coActors(name:ID!): [Person] @cypher(statement:"MATCH (p:Person {name:$name})-[:ACTED_IN]->()<-[:ACTED_IN]-(co) RETURN distinct co") } type MutationType { rateMovie(user:ID!, movie:ID!, rating:Int!): Int @cypher(statement:"MATCH (p:Person {name:$user}),(m:Movie {title:$movie}) MERGE (p)-[r:RATED]->(m) SET r.rating=$rating RETURN r.rating") }

=== New Neo4j-GraphQL-Java Integration

Currently we're working on a https://github.com/neo4j-graphql/neo4j-graphql-java[independent transpiler (neo4j-graphql-java) of GraphQL to Cypher] which can also be used for your own GraphQL servers or middleware on the JVM.

This takes a given GraphQL schema, augments it and then uses that schema to generate Cypher queries from incoming GraphQL queries.

There are small examples of writing GraphQL servers in the repository, but we also wanted to make the new implementation available for testing.

That's why we link:src/main/kotlin/GraphQLResourceExperimental.kt[integrated] the new transpiler at the URL: http://localhost:7474/graphql/experimental/ in this plugin, so that you can test it out. It uses the schema of the main implementation.

Currently supported features are:

  • parse SDL schema
  • resolve query fields via result types
  • handle arguments as equality comparisons for top level and nested fields
  • handle relationships via @relation directive on schema fields
  • @relation directive on types for rich relationships (from, to fields for start & end node)
  • filter for top-level query-fields
  • handle first, offset arguments
  • argument types: string, int, float, array
  • request parameter support
  • parametrization for cypher query
  • aliases
  • inline and named fragments
  • auto-generate query fields for all objects
  • @cypher directive for fields to compute field values, support arguments
  • auto-generate mutation fields for all objects to create, update, delete
  • @cypher directive for top level queries and mutations, supports arguments

For more details see the https://github.com/neo4j-graphql/neo4j-graphql-java/[readme of the transpiler repository].

Here is a query example against the movie graph:


{ person(born:1950) { name, born movies(first: 4) { title actors { name } } } }


=== Procedures

This library also comes with Cypher Procedures to execute GraphQL from within Neo4j.

.Simple Procedure Query [source,cypher]

CALL graphql.query('{ Person(born: 1961) { name, born } }')

.Advanced Procedure Query with parameters and post-processing [source,cypher]

WITH 'query ($year:Long,$limit:Int) { Movie(released: $year, first:$limit) { title, actors {name} } }' as query

CALL graphql.query(query,{year:1995,limit:5}) YIELD result

UNWIND result.Movie as movie RETURN movie.title, [a IN movie.actors | a.name] as actors


.Update with Mutation [source,cypher]

CALL graphql.execute('mutation { createMovie(title:"The Shape of Water", released:2018)}')

== Other Information

Please leave link:/issues[Feedback and Issues^]

You can get quick answers on http://neo4j.com/slack[Neo4j-Users Slack^] in the https://neo4j-users.slack.com/messages/C5ET7S24R[`#neo4j-graphql` channel^]

License: Apache License v2.

This branch for Neo4j {branch}.x

image:https://travis-ci.org/neo4j-contrib/neo4j-graphql.svg?branch={branch}["Build Status", link="https://travis-ci.org/neo4j-contrib/neo4j-graphql"]

== Features

// tag::features[]

[options=header,cols="a,2a,3m"] |===

| name | information | example | entities | each node label represented as entity | { Person {name,born} }

| multi entities | multiple entities per query turned into UNION | { Person {name,born} Movie {title,released} }

| property fields | via sampling property names and types are determined | { Movie {title, released} }

| field parameters | all properties can be used as filtering (exact/list) input parameters, will be turned into Cypher parameters | { Movie(title:"The Matrix") {released,tagline} }

| query parameters | passed through as Cypher parameters | query MovieByParameter ($title: String!) { Person(name:$name) {name,born} }

| filter arguments | nested input types for arbitrary filtering on query types and fields | { Company(filter: { AND: { name_contains: "Ne", country_in ["SE"]}}) { name } }

| filter arguments for relations | filtering on relation fields, suffixes ("",not,some, none, single, every) | { Company(filter: { employees_none { name_contains: "Jan"}, employees_some: { gender_in : [female]}, company_not: null }) { name } }

| relationships | via a @relationship annotated field, optional direction | type Person { name: String, movies : Movie @relation(name:"ACTED_IN", direction:OUT) }

| ordering | via an extra orderBy parameter | query PersonSortQuery { Person(orderBy:[name_desc,born_desc]) {name,born}}

| pagination | via first and offset parameters | query PagedPeople { Person(first:10, offset:20) {name,born}}

| schema first IDL support | define schema via IDL | :POST /graphql/idl "type Person {name: String!, born: Int}"

| Mutations | create/delete mutations inferred from the schema | createMovie(title:ID!, released:Int) updateMovie(title:ID!, released:Int) deleteMovie(title:ID!)

createMoviePersons(title:ID!,persons:[ID!]) + deleteMoviePersons(title:ID!,persons:[ID!])

| Cypher queries | @cypher directive on fields and types, parameter support | actors : Int @cypher(statement:"RETURN size( (this)< -[:ACTED_IN]-() )")

| Cypher updates | Custom mutations by executing @cypher directives | createPerson(name: String) : Person @cypher(statement:"CREATE (p:Person {name:{name}}) RETURN p")

| extensions | extra information returned | fields are: columns, query, warnings, plan, type READ_ONLY/READ_WRITE, // | directive | directives control cypher prefixes, note that directives have to be set at the first entity | // | directive - query plan | @profile / @explain will be returned in extra field extensions | query UserQuery { User @profile {name} }

// | directive - version | set cypher version to use @version(3.0,3.1,3.2) | query UserQuery { User @version(3.0) {name} } |===

[NOTE] @cypher directives can have a passThrough:true argument, that gives sole responsibility for the nested query result for this field to your Cypher query. You will have to provide all data/structure required by client queries. Otherwise, we assume if you return object-types that you will return the appropriate nodes from your statement.

// end::features[]

== Advanced Usage

The extension works with Neo4j 3.x, the code on this branch is for {branch}.

Please consult the https://neo4j.com/docs/operations-manual/current/configuration/file-locations/[Neo4j documentation^] for file locations for the other editions on the different operating systems.

=== Manual Installation

  1. Download the https://github.com/neo4j-graphql/neo4j-graphql/releases[appropriate neo4j-graphql release^] for your version.
  2. Copy the jar-file into Neo4j's plugins directory
  3. Edit the Neo4j settings ($NEO4J_HOME/conf/neo4j.conf) to add: + dbms.unmanaged_extension_classes=org.neo4j.graphql=/graphql
  4. You might need to add ,graphql.* if your config contains this line: + dbms.security.procedures.whitelist=
  5. (Re)start your Neo4j server

NOTE: Neo4j Desktop: the configuration is available under Manage -> Settings, the plugins folder via Open Folder.


If you run Neo4j via Docker:

  • put the jar-file into a /plugins directory and make it available to the container via -v /path/to/plugins:/plugins
  • also add to your environment: +-e NEO4J_dbms_unmanaged__extension__classes=org.neo4j.graphql=/graphql+.

=== Building manually


git clone https://github.com/neo4j-graphql/neo4j-graphql cd neo4j-graphql git checkout {branch} mvn clean package cp target/neo4j-graphql-*.jar $NEO4J_HOME/plugins echo 'dbms.unmanaged_extension_classes=org.neo4j.graphql=/graphql' >> $NEO4J_HOME/conf/neo4j.conf $NEO4J_HOME/bin/neo4j restart

NOTE: You might need to add ,graphql.* if your config contains this line: dbms.security.procedures.whitelist=

=== Schema from Graph

If you didn't provide a GraphQL schema, we try to derive one from the existing graph data. From sampling the data we add a type for each Node-Label with all the properties and their types found as fields.

// Relationship information is collected with direction, type, end-node-labels and degree (to determine single element or collection result). // Additional labels on a node are added as GraphQLInterface's. Each relationship-type adds a reference field to the node type, named aType for A_TYPE. // Each relationship-type and end-node label is added as a virtual property to the node type, named TYPE_Label for outgoing and Label_TYPE for incoming relationships.


You can also use variables or query the schema:

.Which types are in the schema

{ __schema { types { name kind description } } }


.Which types are available for querying

{ __schema { queryType { fields { name, description } } } }

and then query for real data


query PersonQuery($name: String!) { Person(name: $name) { name born actedIn { title released tagline } } }


{"name":"Keanu Reeves"}


=== Procedures

You can even visualize remote graphql schemas, e.g. here from the https://developer.github.com/v4/[GitHub GraphQL API^]. Make sure to generate the https://developer.github.com/v4/guides/forming-calls/#authenticating-with-graphql[Personal Access Token^] to use in your account settings.


call graphql.introspect("https://api.github.com/graphql",{Authorization:"bearer d8xxxxxxxxxxxxxxxxxxxxxxx"})



== Examples

Some more examples

.Relationship Argument

query MoviePersonQuery { Movie { title actedIn(name:"Tom Hanks") { name } } }

.Nested Relationships

query PersonMoviePersonQuery { Person { name actedIn { title actedIn { name } } } }


query PersonQuery { Person(orderBy: [age_asc, name_desc]) { name born } }


== Resources

=== Neo4j-GraphQL

=== Libraries & Tools


=== Similar Projects


// * https://github.com/facebook/dataloader // * http://graphql.org/learn/serving-over-http/[Serving over HTTP]

//// echo "Authorization: Basic $(echo -n "neo4j:test" | base64)" "Authorization: Basic bmVvNGo6dGVzdA==" ////


== Using an http client (curl)

=== POST Schema IDL

curl -u neo4j: -i -XPOST -d'type Person { name: String, born: Int }' http://localhost:7474/graphql/idl/

{Person=MetaData{type='Person', ids=[], indexed=[], properties={name=PropertyType(name=String, array=false, nonNull=false), born=PropertyType(name=Int, array=false, nonNull=false)}, labels=[], relationships={}}}

curl -u neo4j: -i -XPOST -d @movies-schema.graphql http://localhost:7474/graphql/idl/

=== Query the Schema

curl -u neo4j: -i -XPOST -d'{"query": "query {__schema {types {kind, name, description}}}"}' -H accept:application/json -H content-type:application/json http://localhost:7474/graphql/


query {__schema {queryType { kind,description,fields { name } }}}

=== Get All People

curl -u neo4j: -i -XPOST -d'{"query": "query AllPeopleQuery { Person {name,born} } }"}' -H accept:application/json -H content-type:application/json http://localhost:7474/graphql/

HTTP/1.1 200 OK Date: Mon, 24 Oct 2016 21:40:15 GMT Content-Type: application/json Access-Control-Allow-Origin: * Transfer-Encoding: chunked Server: Jetty(9.2.9.v20150224)

{"data":{"Person":[{"name":"Michael Sheen","born":1969},{"name":"Jack Nicholson","born":1937},{"name":"Nathan Lane","born":1956},{"name":"Philip Seymour Hoffman","born":1967},{"name":"Noah Wyle","born":1971},{"name":"Rosie O'Donnell","born":1962},{"name":"Greg Kinnear","born":1963},{"name":"Susan Sarandon","born":1946},{"name":"Takeshi Kitano","born":1947},{"name":"Gary Sinise","born":1955},{"name":"John Goodman","born":1960},{"name":"Christina Ricci","born":1980},{"name":"Jay Mohr","born":1970},{"name":"Ben Miles","born":1967},{"name":"Carrie Fisher","born":1956},{"name":"Christopher Guest","born":1948},{"name ...

=== Get one Person by name with Parameter

curl -u neo4j: -i -XPOST -d'{"query":"query PersonQuery($name:String!) { Person(name:$name) {name,born} }", "variables":{"name":"Kevin Bacon"}}' -H content-type:application/json http://localhost:7474/graphql/

HTTP/1.1 200 OK Date: Mon, 24 Oct 2016 21:40:38 GMT Content-Type: application/json Access-Control-Allow-Origin: * Transfer-Encoding: chunked Server: Jetty(9.2.9.v20150224)

{"data":{"Person":[{"name":"Kevin Bacon","born":1958}]}}

=== Get one Person by name literal with related movies

curl -u neo4j: -i -XPOST -d'{"query":"query PersonQuery { Person(name:"Tom Hanks") {name, born, actedIn {title, released} } }"}' -H content-type:application/json http://localhost:7474/graphql/ HTTP/1.1 200 OK Date: Tue, 25 Oct 2016 03:17:08 GMT Content-Type: application/json Access-Control-Allow-Origin: * Transfer-Encoding: chunked Server: Jetty(9.2.9.v20150224)

{"data":{"Person":[{"name":"Tom Hanks","born":1956,"actedIn":[{"title":"Charlie Wilson's War","released":2007},{"title":"A League of Their Own","released":1992},{"title":"The Polar Express","released":2004},{"title":"The Green Mile","released":1999},{"title":"Cast Away","released":2000},{"title":"Apollo 13","released":1995},{"title":"The Da Vinci Code","released":2006},{"title":"Cloud Atlas","released":2012},{"title":"Joe Versus the Volcano","released":1990},{"title":"Sleepless in Seattle","released":1993},{"title":"You've Got Mail","released":1998},{"title":"That Thing You Do","released":1996}]}]}}

=== Schema first

curl -X POST http://localhost:7474/graphql/idl -d 'type Person { name: String! born: Int movies: [Movie] @relation(name:"ACTED_IN") totalMoviesCount: Int @cypher(statement: "WITH {this} AS this MATCH (this)-[:ACTED_IN]->() RETURN count(*) AS totalMoviesCount") recommendedColleagues: [Person] @cypher(statement: "WITH {this} AS this MATCH (this)-[:ACTED_IN]->()<-[:ACTED_IN]-(other) RETURN other") }

    type Movie  {
        title: String!
        released: Int
        tagline: String
        actors: [Person] @relation(name:"ACTED_IN",direction:IN)
     }' -u neo4j:****


//// == TODO

  • Non-Null and Nullable Input and Output Types
  • https://www.reindex.io/docs/graphql-api/connections/#connection-arguments[Pagination]: Skip and Limit (first,last,after,before,skip,limit)
  • āˆš https://www.reindex.io/docs/graphql-api/connections/#orderby[orderBy] with enum _PersonOrdering { name_asc,name_desc,... }
  • https://www.reindex.io/docs/graphql-api/connections/#filtering[Filtering] with support of a object argument for an input-argument-field, with key=comparator, and value compare-value + (status: {eq/neq:true}, createdAt: { gte: "2016-01-01", lt: "2016-02-01"}, tags: {isNull:false, includes/excludes: "foo"})
  • Handle result aggregation.
  • How to handle Geospatial and other complex input types
  • āˆš Support for Directives, e.g. to specify the cypher compiler or runtime? or special handling for certain fields or types
  • āˆš Add extensions result value for query statistics or query plan, depending on directives given, e.g. contain the generated cypher query as well
  • @skip, @include directives, check if they are handled by the library
  • āˆš handle nested relationships as optional or non-optional (perhaps via nullable?) or directive
  • āˆš project non-found nested results as null vs. map with null-value entries
  • https://facebook.github.io/relay/docs/graphql-connections.html#content[Connection] add support for edges / nodes special properties
  • āˆš Support 3.1+ via pattern comprehensions and map projections
  • Improvements: consider replacing MetaData with GraphQL types,
  • check if there is a direct conversion from parsed data (AST-Nodes) to graphql-schema types


//// == Rewrite

  • Replace Metadata with GraphQLTypes / Interfaces -> use GraphQLReferenceType to break cyclic dependencies
  • Keep tests
  • Store meta-information in directives (@relation, @isUnique etc.)
  • Change db-scanner to generate GraphQL-Types
  • Use schema parser to turn IDL into types
  • Add transformations, that e.g. adds dynamic query and mutation types with @cypher directives and custom enums/input objects
  • Add transformation for pagination, filter, ordering on all primitive fields
  • Allow for further transformations
  • Unify custom and generated dynamic fields (handle mutations and root queries separately with graphql.run procedure, inline with function
  • Generate Cypher query from current query + schema information
  • Build easy transform functions from schema objects into simpler data clases e.g. a Cypher class with (query, parameters) or Relationship(field,type,direction,start-label,end-label)
  • The only "wiring" we have to add is for top level objects
  1. Schema source
  2. Schema
  3. Transform/Augment with custom queries & mutations
  4. Generate queries based on schema + query

== Open

  • Unions
  • Subscriptions

== Permissions

  • provide username, adminstatus and roles as parameters to cypher query
  • make them queryable from graphql with __User {name, roles, admin, active}
  • support the permission queries from graph cool using the user and their roles ////

== Neo4j Admin API

The project also contains an experimental endpoint to expose procedures deployed into Neo4j (built-in and external) as a GraphQL admin API endpoint.

If you access /graphql/admin in GraphiQL or GraphQL Playground, you should see those separated into queries and mutations in the schema.

You have to explicitely allow procedures to be exposed, via the config setting graphql.admin.procedures.(read/write) with either Neo4j procedure syntax or admin-endpoint field names. By setting it to:

graphql.admin.procedures.read=db.,dbms.components,dbms.queryJ graphql.admin.procedures.write=db.create*,dbIndexExplicitFor*

For documentation on each please check the provided description or the documentation of the original procedure in the Neo4j or other manuals.


You will have to provide the appropriate user credentials as HTTP Basic-Auth headers, the procedures are executed under the priviledges of that user.

You can read more about it https://medium.com/@mesirii/using-a-graphql-api-for-database-administration[in this article^].

Neo4j Graphql

GraphQL bindings for Neo4j, generates and runs Cypher

Neo4j Graphql Info

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šŸ˜Ž Author neo4j-graphql