Before you begin, convert the API definition to OpenAPI 3.0 if you already haven't done so.

1. Clone this repository and build the plugin.
2. Include the given plugin to the pom.xml file of the module org.wso2.carbon.identity.api.server.<resource>.<version>

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>4.1.2</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/<resource>.yaml</inputSpec>
                <generatorName>org.wso2.carbon.codegen.CxfWso2Generator</generatorName>
                <configOptions>
                    <sourceFolder>src/gen/java</sourceFolder>
                    <apiPackage>org.wso2.carbon.identity.api.server.<resource>.<version></apiPackage>
                    <modelPackage>org.wso2.carbon.identity.api.server.<resource>.<version>.model</modelPackage>
                    <packageName>org.wso2.carbon.identity.api.server.<resource>.<version></packageName>
                    <dateLibrary>java8</dateLibrary>
                    <hideGenerationTimestamp>true</hideGenerationTimestamp>
                </configOptions>
                <output>.</output>
                <skipOverwrite>false</skipOverwrite>
            </configuration>
        </execution>
    </executions>
    <dependencies>
        <dependency>
            <groupId>org.openapitools</groupId>
            <artifactId>cxf-wso2-openapi-generator</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
</plugin>

For example:

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>4.1.2</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/identity-governance-3.yaml</inputSpec>
                <generatorName>org.wso2.carbon.codegen.CxfWso2Generator</generatorName>
                <configOptions>
                    <sourceFolder>src/gen/java</sourceFolder>
                    <apiPackage>org.wso2.carbon.identity.api.server.identity.governance.v1</apiPackage>
                    <modelPackage>org.wso2.carbon.identity.api.server.identity.governance.v1.model</modelPackage>
                    <packageName>org.wso2.carbon.identity.api.server.identity.governance.v1</packageName>
                    <dateLibrary>java8</dateLibrary>
                    <hideGenerationTimestamp>true</hideGenerationTimestamp>
                </configOptions>
                <output>.</output>
                <skipOverwrite>false</skipOverwrite>
            </configuration>
        </execution>
    </executions>
    <dependencies>
        <dependency>
            <groupId>org.openapitools</groupId>
            <artifactId>cxf-wso2-openapi-generator</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
</plugin>

3. Run the following command inside the module org.wso2.carbon.identity.api.server.. to generate the stubs

mvn clean install

4. Comment out the plugin added for your API definition before committing to the git.

Supported vendor extensions

Extension	Purpose	Description	Example
x-gen-include-req-res	Get the HttpServletRequest and the HttpServletResponse objects to the generated code.	Should be added to root of the yaml. If the value is set to true then the request and response objects will be available in the generated api impl classes.	x-gen-include-req-res: true