How to generate java entity by Graphql schema

I'm a newcomer for graphql java client development. Recently I meet a problem that how to generate a java entity through the graphql schema definition. Since in my side, the schema is always changing by another side, so I want a method to generate the java entity class automatically instead of reading the schema manually then change the code. If there are any practices on such a requirement? Thanks.

Solution

You could look into the following maven plugin. It would help you generate Java classes from your .graphqls files.

Assuming you have only one file defining your GraphQL model, named myGraphqls, I would use this plugin as follow:

<build>
    <plugins>
        <plugin>
            <groupId>io.github.kobylynskyi</groupId>
            <artifactId>graphql-codegen-maven-plugin</artifactId>
            <version>1.2.3</version>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                    <configuration>
                        <graphqlSchemaPaths>
                            <graphqlSchemaPath>${project.basedir}/src/main/resources/graphql/myGraphqls.graphqls</graphqlSchemaPath>
                        </graphqlSchemaPaths>
                        <outputDir>${project.build.directory}/generated-sources/graphql</outputDir>
                        <packageName>com.graphql.model</packageName>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

After running maven, you would be able to find in the generated-sources folder, a folder named graphql with the classes generated under the package com.graphql.model.