Table of Contents

• Quick start
  • Using Gradle
  • Using Maven
• Documentation
• Requirements and Downloads
  • Snapshots
• Enable GraphQL Servlet
• Enable GraphiQL
• Enable Altair
• Enable GraphQL Playground
  • Basic settings
  • CDN
  • Custom static resources
  • Customizing GraphQL Playground
  • Tabs
• Enable GraphQL Voyager
  • GraphQL Voyager Basic settings
  • GraphQL Voyager CDN
  • Customizing GraphQL Voyager
• Supported GraphQL-Java Libraries
  • GraphQL Java Tools
  • GraphQL Annotations
    • Configuration
    • Root resolvers, directives, type extensions
    • Interfaces
    • Custom scalars and type functions
    • Custom Relay and GraphQL Annotation Processor
  • Extended scalars
  • Aliased scalars
• Tracing and Metrics
  • Usage
  • FAQs
    • WARNING: NoClassDefFoundError when using GraphQL Java Tools > 5.4.x
• Contributions
• Licenses

Set the Kotlin version in your gradle.properties

kotlin.version=1.3.70 

Set the Kotlin version in your <properties> section

<properties> <kotlin.version>1.3.70</kotlin.version> </properties>

See our new Documentation.

Requirements:

• Java 1.8
• Spring Framework Boot > 2.x.x (web)

Gradle:

repositories { mavenCentral() } dependencies { implementation 'com.graphql-java-kickstart:graphql-spring-boot-starter:14.0.0' // testing facilities testImplementation 'com.graphql-java-kickstart:graphql-spring-boot-starter-test:14.0.0' }

Maven:

<dependency> <groupId>com.graphql-java-kickstart</groupId> <artifactId>graphql-spring-boot-starter</artifactId> <version>14.0.0</version> </dependency> <!-- testing facilities --> <dependency> <groupId>com.graphql-java-kickstart</groupId> <artifactId>graphql-spring-boot-starter-test</artifactId> <version>14.0.0</version> <scope>test</scope> </dependency> 

<repositories> <repository> <id>osshr-snapshots</id> <name>osshr-sonatype-snapshots</name> <url>https://oss.sonatype.org/content/repositories/snapshots/</url> </repository> </repositories>

For gradle:

repositories { maven { url "https://oss.sonatype.org/content/repositories/snapshots/" } }

The servlet becomes accessible at /graphql if graphql-spring-boot-starter added as a dependency to a boot application and a GraphQLSchema bean is present in the application. Check out the simple example for the bare minimum required.

A GraphQL schema can also be automatically created when a supported graphql-java schema library is found on the classpath.

See the graphql-java-servlet usage docs for the avaiable endpoints exposed.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: servlet: # Sets if GraphQL servlet should be created and exposed. If not specified defaults to "true". enabled: true # Sets the path where GraphQL servlet will be exposed. If not specified defaults to "/graphql" mapping: /graphql cors-enabled: true cors: allowed-origins: http://some.domain.com allowed-methods: GET, HEAD, POST # if you want to @ExceptionHandler annotation for custom GraphQLErrors exception-handlers-enabled: true context-setting: PER_REQUEST_WITH_INSTRUMENTATION # Sets if asynchronous operations are supported for GraphQL requests. If not specified defaults to true. async-mode-enabled: true

By default a global CORS filter is enabled for /graphql/** context. The corsEnabled can be set to false to disable it.

GraphiQL becomes accessible at the root /graphiql if the graphql.graphiql.enabled property is true.

Note that GraphQL server must be available at /graphql/* context to be discovered by GraphiQL.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: graphiql: mapping: /graphiql endpoint: graphql: /graphql subscriptions: /subscriptions subscriptions: timeout: 30 reconnect: false basePath: / enabled: true pageTitle: GraphiQL cdn: enabled: false version: latest props: resources: query: query.graphql defaultQuery: defaultQuery.graphql variables: variables.json variables: editorTheme: "solarized light" headers: Authorization: "Bearer <your-token>"

By default GraphiQL is served from within the package. This can be configured to be served from CDN instead, by setting the property graphiql.cdn.enabled to true.

You are able to set the GraphiQL props as well. The graphiql.props.variables group can contain any of the props as defined at GraphiQL Usage. Since setting (large) queries in the properties like this isn't very readable, you can use the properties in the graphiql.props.resources group to set the classpath resources that should be loaded.

Headers that are used when sending the GraphiQL queries can be set by defining them in the graphiql.headers group.

Altair becomes accessible at the root /altair if the graphql.altair.enabled property is true.

Note that GraphQL server must be available at /graphql/* context to be discovered by Altair.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: altair: enabled: true mapping: /altair subscriptions: timeout: 30 reconnect: false static: base-path: / page-title: Altair cdn: enabled: false version: 4.0.2 options: endpoint-url: /graphql subscriptions-endpoint: /subscriptions initial-settings: theme: dracula initial-headers: Authorization: "Bearer <your-token>" resources: initial-query: defaultQuery.graphql initial-variables: variables.graphql initial-pre-request-script: pre-request.graphql initial-post-request-script: post-request.graphql

By default Altair is served from within the package. This can be configured to be served from CDN instead, by setting the property graphql.altair.cdn.enabled to true.

You are able to set the Altair options as well using the graphql.altair.options group. Since setting ( large) queries in the properties like this isn't very readable, you can use the properties in the graphql.altair.resources group to set the classpath resources that should be loaded.

GraphQL Playground becomes accessible at root /playground (or as configured in graphql.playground.mapping) if the graphql.playground.enabled property is true.

It uses an embedded GraphQL Playground React, in accordance to the official guide, using the 'minimum HTML' approach.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: playground: mapping: /playground endpoint: /graphql subscriptionEndpoint: /subscriptions staticPath.base: my-playground-resources-folder enabled: true pageTitle: Playground cdn: enabled: false version: latest settings: editor.cursorShape: line editor.fontFamily: "'Source Code Pro', 'Consolas', 'Inconsolata', 'Droid Sans Mono', 'Monaco', monospace" editor.fontSize: 14 editor.reuseHeaders: true editor.theme: dark general.betaUpdates: false prettier.printWidth: 80 prettier.tabWidth: 2 prettier.useTabs: false request.credentials: omit schema.polling.enable: true schema.polling.endpointFilter: "*localhost*" schema.polling.interval: 2000 schema.disableComments: true tracing.hideTracingResponse: true headers: headerFor: AllTabs tabs: - name: Example Tab query: classpath:exampleQuery.graphql headers: SomeHeader: Some value variables: classpath:variables.json responses: - classpath:exampleResponse1.json - classpath:exampleResponse2.json

mapping, endpoint and subscriptionEndpoint will default to /playground, /graphql and /subscriptions, respectively. Note that these values may not be empty.

enabled defaults to true, and therefor Playground will be available by default if the dependency is added to a Spring Boot Web Application project.

pageTitle defaults to Playground.

headers allows you to specify headers for the default tab. Note that if your are using Spring Security and CSRF is enabled CSRF, the CSRF token will be automatically added to the headers. These headers will also be added to all the tabs configured under the Tabs section. If a header is defined both in this 'global' header list and the header list of the individual tabs, the 'local' version will be used for that tab.

The currently bundled version is 1.7.20, which is - as of writing this - the latest release of GraphQL Playground React. The CDN option uses jsDelivr CDN, if enabled. By default, it will load the latest available release. Available CDN versions can be found on the project's jsDelivr page. The CDN option is disabled by default.

You can also specify a custom local version of Playground by setting the base path for Playground resources in the staticPath.base property. Under this directory, you have to provide the following files:

• static/css/index.css
• static/js/middleware.js
• favicon.png
• logo.png

This is identical to the directory structure of the CDN under the build subfolder (where these files can be found).

Further GraphQL Playground settings can be specified under the settings group, which are documented in the official GraphQL Playground readme. Note that enum-like values are validated against the available options, and your application will not start if wrong settings are provided. Similarly there is some basic validation for integer values (they must be valid positive integers).

Optionally, you can specify tabs that will be present when the user first opens GraphQL Playground. You can configure the query, variables, headers and even supply sample responses. Note that query , variables and responses are expected to be resources of the appropriate format (GraphQL for query, JSON for variables and responses).

GraphQL Voyager becomes accessible at root /voyager (or as configured in voyager.mapping) if the graphql.voyager.enabled property is true.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: voyager: enabled: true basePath: / mapping: /voyager endpoint: /graphql cdn: enabled: false version: latest pageTitle: Voyager displayOptions: skipRelay: true skipDeprecated: true rootType: Query sortByAlphabet: false showLeafFields: true hideRoot: false hideDocs: false hideSettings: false

mapping and endpoint will default to /voyager and /graphql, respectively. Note that these values may not be empty.

enabled defaults to true, and therefor GraphQL Voyager will be available by default if the dependency is added to a Spring Boot Web Application project.

pageTitle defaults to Voyager.

All other properties default to the same as documented on the official GraphQL Voyager readme

The currently bundled version is 1.0.0-rc31, which is - as of writing this - the latest release of GraphQL Voyager. The CDN option uses jsDelivr CDN, if enabled. By default, it will load the latest available release. Available CDN versions can be found on the project's jsDelivr page. The CDN option is disabled by default.

Further GraphQL Voyager displayOptions, hideDocs and hideSettings customizations can be configured, as documented in the official GraphQL Voyager readme.

The following libraries have auto-configuration classes for creating a GraphQLSchema.

https://github.com/graphql-java-kickstart/graphql-java-tools

All GraphQLResolver and GraphQLScalar beans, along with a bean of type SchemaParserDictionary (to provide all other classes), will be used to create a GraphQLSchema. Any files on the classpath named *.graphqls will be used to provide the schema definition. See the Readme for more info.

Available Spring Boot configuration parameters (either application.yml or application.properties):

graphql: tools: schema-location-pattern: "**/*.graphqls" # Enable or disable the introspection query. Disabling it puts your server in contravention of the GraphQL # specification and expectations of most clients, so use this option with caution introspection-enabled: true

By default GraphQL tools uses the location pattern **/*.graphqls to scan for GraphQL schemas on the classpath. Use the schemaLocationPattern property to customize this pattern.

https://github.com/Enigmatis/graphql-java-annotations

To use GraphQL Annotations library instead of GraphQL Java Tools, set the graphql.schema-strategy property to annotations.

The schema will be built using the GraphQL Annotations library in a code-first approach - instead of writing it manually, the schema will be constructed based on the Java code. Please see the documentation of the GraphQL Annotations library for a detailed documentation of the available annotations. This readme focuses on how GraphQL Annotations - GraphQL Spring Boot Starter integration works.

graphql: annotations: base-package: com.example.graphl.schema # required always-prettify: true #true is the default value, no need to specify it 

The most important parameter is the base package. The starter will look for schema-relevant classes in the specified package and its subpackages. always-prettify will "prettify" getter/setter methods - the get/set/is prefix will be removed from GraphQL fields automatically.

The root resolvers must be marked with the GraphQLQueryResolver, GraphQLMutationResolver and GraphQLSubscription annotations (not to be confused with the marker interfaces from the GraphQL Java Tools library).

Important:

Unlike GraphQL Java Tools, GraphQL Annotations only supports one of them each. Furthermore, GraphQL Annotations only accepts a class as input, not an instance. It will either create a new instance of the class itself, or use static methods. This means that Spring dependency injection will not work in the usual way. The companion example project (which can be found in the samples repository) demonstrates possible workarounds for this issue.

GraphQLDirectiveDefinition and GraphQLTypeExtension-annotated classes are subject to the same limitation regarding dependency injection - but there can be any number of them.

Interfaces in the configured package having at least one of their methods marked as @GraphQLField are considered a GraphQL interface, and their implementations are automatically added to the schema. Furthermore, you have to add the following annotation to GraphQL interfaces: @GraphQLTypeResolver(GraphQLInterfaceTypeResolver.class)

Custom scalars can be defined in the same way as in the case of using GraphQL Java Tools - just define the GraphQLScalarType beans.

The starter will also pick up TypeFunction beans and pass them to the schema builder.

In these cases the actual beans will be used, not just the classes. Spring dependency injection works as usual.

It is possible to define a bean implementing Relay and/or GraphQLAnnotations. If present, these will be passed to the schema builder. Spring dependency injection works as usual. Note that GraphQL Annotations provides default implementation for these which should be sufficient is most cases.

Extended scalars can be enabled by using the graphql.extended-scalars configuration property, e. g.:

graphql: extended-scalars: BigDecimal, Date

The available scalars are the following: BigDecimal, BigInteger, Byte, Char, Date, DateTime, JSON, LocalTime (since 13.0.0), Locale, Long, NegativeFloat, NegativeInt, NonNegativeFloat, NonNegativeInt, NonPositiveFloat,NonPositiveInt, Object, PositiveFloat, PositiveInt, Short, Time, UUID (since 13.0.0), Url.

This setting works with both the GraphQL Java Tools and the GraphQL Annotations integration.

When using the GraphQL Java Tools integration, the scalars must also be declared in the GraphQL Schema:

scalar BigDecimal scalar Date

Requires version 13.0.0 or greater

The starter also supports aliased scalars. You can define aliases for any standard or extended scalar, as shown in the example below. Note that the original extended scalar (BigDecimal) will not be available. You have to use graphql.extended-scalars property to declare it.

graphql: aliased-scalars: BigDecimal: Number, Decimal String: Text

When using the GraphQL Java Tools integration, the aliased scalars must also be declared in the GraphQL Schema:

scalar Number scalar Decimal scalar Text

Note: Custom scalar beans cannot be aliased this way. If you need to alias them, you have to manually declare the aliased scalar bean.

Apollo style tracing along with two levels of metrics based on them are currently configurable. Full tracing is based on the GraphQL java implementation, and can be enabled in the application.yml or application.properties file:

graphql: servlet: tracing-enabled: true

the default value is false, with "metrics-only" being available. Metrics-only does not add the tracing extension to the response.

Metrics utilize one of two forms of tracing to feed information to Micrometer. If tracing is enabled, or set to "metrics-only", full tracing metrics will be collected, otherwise a tracing implementation that does not collect field data will be injected. Metrics can be configured in the application.yml or application.properties to either true or false, with a default of false:

graphql: servlet: actuator-metrics: true

See Baeldung Spring Boot Actuators for the basics of using Actuator. Add spring-boot-starter-actuator to your project as dependency.

The following metrics are available for exposure:

• graphql.timer.query
• graphql.websocket.sessions - number of active websocket sessions for subscriptions
• graphql.websocket.subscriptions - number of active subscriptions

If you're using graphql-java-tools in combination with Spring Boot 2.1.x or below then you need to set the kotlin.version in your Spring Boot project explicitly to version >= 1.3.70, because Spring Boot Starter parent of that Spring Boot version overrides it with a 1.2.* version of Kotlin. graphql-java-tools requires 1.3.* however because of its coroutine support. If you don't override this version you will run into a NoClassDefFoundError.

Spring Boot team has indicated the Kotlin version will be upgraded to 1.3 in Spring Boot 2.2.

Contributions are welcome. Please respect the Code of Conduct.

graphql-spring-boot-starter is licensed under the MIT License. See LICENSE for details.

graphql-java License

graphiql License

graphql-js License