Web3j OpenAPI Gradle Plugin

Gradle plugin that generates Web3j-OpenAPI project from Solidity smart contracts. It smoothly integrates with your project's build lifecycle by adding specific tasks that can be also run independently.

Plugin configuration

To configure the Web3j Gradle Plugin using the plugins DSL or the legacy plugin application, check the plugin page. The minimum Gradle version to run the plugin is 5.+.

You should not add the Kotlin plugin to your project build. It already comes with the web3j-openapi-gradle-plugin and applying it again may cause issues.

Then run your project containing Solidity contracts:

./gradlew build

After applying the plugin, the base directory for generated code (by default $buildDir/generated/sources/web3j) will contain a directory containing the generated project for all the contracts specified in the configuration.

Code generation

The web3j DSL allows to configure the generated code, e.g.:

web3j {
    generatedPackageName = 'com.mycompany'
    generatedFilesBaseDir = "$buildDir/custom/destination"
    excludedContracts = ['Ownable']
    openapi {
        contextPath = "api"
    }
}

The properties accepted by the openapi DSL are listed in the following table:

Name	Type	Default value	Description
projectName	String	${rootProject.name} or OpenAPI	Generated Web3j-OpenAPI project name.
contextPath	String	$projectName	Generated Web3j-OpenAPI context path /{contextPath}/....
generateServer	Boolean	true	Whether to generate the API implementation and contract wrappers or only the interfaces

Check the web3j-gradle-plugin for the options accepted by the web3j DSL.

The generatedPackageName is a . separated list of words. It will be converted to lower case during the generation.

The default value for the generatePackageName is : org.web3j.openapi

The .{0} is not accepted in the case we are generating an OpenAPI project.

Source sets

By default, all .sol files in $projectDir/src/main/solidity will be processed by the plugin. To specify and add different source sets, use the sourceSets DSL:

sourceSets {
    main {
        solidity {
            srcDir { 
                "my/custom/path/to/solidity" 
             }
        }
    }
}

Check the Solidity Plugin documentation to configure the smart contracts source code directories.

Output directories for generated Web3j-OpenAPI project will be added to your build automatically.

Swagger UI

The Swagger UI page will be found on : http://{host}:{port}/swagger-ui, after running the project ./gradlew run and specifying the Web3j-OpenAPI runtime configuration.

Plugin tasks

The Web3j-OpenAPI Gradle plugin adds tasks to your project build using a naming convention on a per source set basis (i.e. generateWeb3jOpenApi, generate[SourceSet]Web3jOpenApi).

To obtain a list and description of all added tasks, run the command:

./gradlew tasks --all