Java Resolvers

          npm i -D @graphql-codegen/java-resolvers
        

          yarn add -D @graphql-codegen/java-resolvers
        

          pnpm add -D @graphql-codegen/java-resolvers
        

          bun add -D @graphql-codegen/java-resolvers
        

Config API Reference

package

type: string

Customize the Java package name. The default package name will be generated according to the output file path.

mappers

type: object

Allow you to replace specific GraphQL types with your custom model classes. This is useful when you want to make sure your resolvers returns the correct class. The default value is the values set by defaultMapper configuration. You can use a direct path to the package, or use package#class syntax to have it imported.

defaultMapper

type: string

Sets the default mapper value in case it’s not specified by mappers. You can use a direct path to the package, or use package#class syntax to have it imported. The default mapper is Java’s Object. Default value: “Object”

className

type: string

Allow you to customize the parent class name. Default value: “Resolvers”

listType

type: string

Allow you to customize the list type. Default value: “Iterable”

strictScalars

type: boolean

Makes scalars strict.

If scalars are found in the schema that are not defined in scalars an error will be thrown during codegen. Default value: “false”

defaultScalarType

type: string

Allows you to override the type that unknown scalars will have. Default value: “any”

scalars

type: object

Extends or overrides the built-in scalars and custom GraphQL scalars to a custom type.

namingConvention

type: object

Allow you to override the naming convention of the output. You can either override all namings, or specify an object with specific custom naming convention per output. The format of the converter must be a valid module#method. Allowed values for specific output are: typeNames, enumValues. You can also use “keep” to keep all GraphQL names as-is. Additionally, you can set transformUnderscore to true if you want to override the default behavior, which is to preserve underscores.

Available case functions in change-case-all are camelCase, capitalCase, constantCase, dotCase, headerCase, noCase, paramCase, pascalCase, pathCase, sentenceCase, snakeCase, lowerCase, localeLowerCase, lowerCaseFirst, spongeCase, titleCase, upperCase, localeUpperCase and upperCaseFirst See more Default value: “change-case-all#pascalCase”

typesPrefix

type: string

Prefixes all the generated types. Default value: ""

typesSuffix

type: string

Suffixes all the generated types. Default value: ""

skipTypename

type: boolean

Does not add __typename to the generated types, unless it was specified in the selection set. Default value: “false”

nonOptionalTypename

type: boolean

Automatically adds __typename field to the generated types, even when they are not specified in the selection set, and makes it non-optional Default value: “false”

useTypeImports

type: boolean

Will use import type {} rather than import {} when importing only types. This gives compatibility with TypeScript’s “importsNotUsedAsValues”: “error” option Default value: “false”

inlineFragmentTypes

type: string

Whether fragment types should be inlined into other operations. “inline” is the default behavior and will perform deep inlining fragment types within operation type definitions. “combine” is the previous behavior that uses fragment type references without inlining the types (and might cause issues with deeply nested fragment that uses list types). “mask” transforms the types for use with fragment masking. Useful when masked types are needed when not using the “client” preset e.g. such as combining it with Apollo Client’s data masking feature. Default value: “inline”

emitLegacyCommonJSImports

type: boolean

Emit legacy common js imports. Default it will be true this way it ensure that generated code works with non-compliant bundlers. Default value: “true”

importExtension

type: object

Append this extension to all imports. Useful for ESM environments that require file extensions in import statements.

extractAllFieldsToTypes

type: boolean

Extract all field types to their own types, instead of inlining them. This helps to reduce type duplication, and makes type errors more readable. It can also significantly reduce the size of the generated code, the generation time, and the typechecking time. Default value: “false”

printFieldsOnNewLines

type: boolean

If you prefer to have each field in generated types printed on a new line, set this to true. This can be useful for improving readability of the resulting types, without resorting to running tools like Prettier on the output. Default value: “false”

includeExternalFragments

type: boolean

Whether to include external fragments in the generated code. External fragments are not defined in the same location as the operation definition. Default value: “false”

import com.my.app.generated.Resolvers;
import com.my.app.models.User;
import graphql.schema.DataFetcher;

export class QueryResolvers implements Resolvers.Query {
  public DataFetcher<String> id() {
    return environment -> environment.<User>getSource().getId();
  }
}

plugins {
  id "com.moowork.node" version "1.3.1"
}

build.dependsOn yarn

{
  "name": "java-app",
  "scripts": {
    "postinstall": "graphql-codegen"
  },
  "dependencies": {
    "graphql": "14.5.8",
    "@graphql-codegen/cli": "1.7.0",
    "@graphql-codegen/RELEVANT_PLUGIN": "1.7.0"
  }
}

schema: src/main/resources/schema.graphqls
generates:
  src/main/java/com/my-name/my-app/generated/File.java:
    - RELEVANT_PLUGIN # Replace with your plugin name

yarn.lock
node_modules