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SCM-Manager v2 Plugin Development

Build and testing

The plugin can be compiled and packaged with the normal maven lifecycle:

  • clean - mvn clean - removes the target directory, can be combined with other phases
  • compile - mvn compile - compiles Java code and creates the ui bundle
  • test - mvn test - executes test for Java and JavaScript
  • install - mvn install - installs the plugin (smp and jar) in the local maven repository
  • package - mvn package - creates the final plugin bundle (smp package) in the target folder
  • deploy - mvn deploy - deploys the plugin (smp and jar) to the configured remote repository

For the development and testing the serve lifecycle of the plugin can be used:

  • run - mvn run - starts scm-manager with the plugin pre installed.

If the plugin was started with mvn run, the default browser of the os should be automatically opened. If the browser does not start automatically, start it manually and go to http://localhost:8081/scm.

In this mode each change to web files (src/main/js or src/main/webapp), should trigger a reload of the browser with the made changes. If you compile a class (e.g.: with your IDE from src/main/java to target/classes), the SCM-Manager context will restart automatically. So you can see your changes without restarting the server.

Directory & File structure

A quick look at the files and directories you'll see in a SCM-Manager project.

├── node_modules/
├── src/
|   ├── main/
|   |   ├── java/
|   |   ├── js/
|   |   └── resources/
|   ├── test/
|   |   ├── java/
|   |   └── resources/
|   └── target/
├── .editorconfig
├── .gitignore
├── package.json
├── pom.xml
├── tsconfig.json
└── yarn.lock
  1. node_modules/: This directory contains all of the modules of code that your project depends on (npm packages) are automatically installed.

  2. src/: This directory will contain all of the code related to what you see or not. src is a convention for “source code”.

    1. main/
      1. java/: This directory contain the Java code.
      2. js/: This directory contains the TypeScript code for the web ui, inclusive unit tests: suffixed with .test.ts or .test.tsx
      3. resources/: This directory contains the the classpath resources.
    2. test/
      1. java/: This directory contains the Java unit tests.
      2. resources/: This directory contains classpath resources for unit tests.
    3. target/: This is the build directory.
  3. .editorconfig: This is a configuration file for your editor using EditorConfig. The file specifies a style that IDEs use for code.

  4. .gitignore: This file tells git which files it should not track / not maintain a version history for.

  5. All notable changes to this project will be documented in this file.

  6. LICENSE: This project is licensed under the MIT license.

  7. package.json: Here you can find the dependency/build configuration and dependencies for the frontend.

  8. pom.xml: Maven configuration, which also includes things like metadata.

  9. This file, containing useful reference information about the project.

  10. tsconfig.json This is the typescript configuration file.

  11. yarn.lock: This is the ui dependency configuration.

UI Extensions

Plugins are able to extend or modify the ui of SCM-Manager. In order to extend the ui the plugin requires a package.json in the project root e.g:

  "name": "@scm-manager/scm-readme-plugin",
  "main": "src/main/js/index.tsx",
  "scripts": {
    "build" : "ui-scripts plugin",
    "watch" : "ui-scripts plugin-watch",
    "test" : "jest",
    "postinstall" : "ui-plugins postinstall"
  "dependencies": {
    "@scm-manager/ui-plugins" : "2.0.0"

The main field of the package.json describes the main entry point of the plugin. The file specified at main should use the binder from the @scm-manager/ui-extensions in oder to bind its extensions.

If the plugins gets build (mvn package or mvn install), the buildfrontend-maven-plugin, will call the build script of package.json. The build script triggers the plugin command of @scm-manager/ui-scripts. The ui-scripts will do the following steps:

  • traverses the import statements of the script specified at main
  • transpiles TypeScript to es5
  • creates a single bundle
  • stores the bundle in the final smp package

At runtime the plugins are loaded by PluginLoader. The PluginLoader is a React component, which does the following steps:

  • fetches plugin metadata (name and registered bundles) from the rest service
  • fetches each bundle of every plugin
  • executes each bundle
  • starts the rest of the application

Static web resources

A plugin can also store static files in the src/main/webapp directory. All files of the webapp directory can be resolved relative to the root of the application e.g. the file src/main/webapp/images/logo.jpg of a plugin can be resolved at http://localhost:8081/scm/images/logo.jpg assuming SCM-Manager is running at http://localhost:8081/scm.