Groovy based generation tasks from JSON schema
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.
LICENSE corrected typos Jan 29, 2018


A simple Groovy based program to do generation tasks from a JSON schema.


  • Java 8
  • Gradle v4.*

Unsupported JSON schema features

  • patternProperties - make no sense in model description
  • only references in the local document and local file system are supported

Additional features

  • easier version markup in model
  • mark attributes as aggregation types (references) with suffix '_id'
  • additional property attribute 'aggregationType' to set the specific attribute information
  • allOf - to implement inheritance
    // How to mark different aggregation types in the model
    // Attention, this works only for "$ref" types!
    "Greens": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "green_id": {
            // aggregation
            "$ref": "#/definitions/GreenType"
        "green_obj": {
            // composition
            "$ref": "#/definitions/GreenType"
        "green_obj": {
            // aggregation
            "__aggregationType": "aggregation",
            "$ref": "#/definitions/GreenType"
        "greens": {
          // composotion
          "type": "array",
          "items": {
            "$ref": "#/definitions/GreenType"

Handle with gradle

Using with gradle

# do a complete release to configured maven repository
gradle publish

# builds a release with all dependencies
# release is built in PROJECT_DIR/build/release
# before a release is build the tests are executed - skip not possible
gradle buildRelease

# builds release and copy artifacts to docker image dir as preparation for the image build
gradle copyReleaseToDockerImage

# run program without any arguments from project
gradle myRun

# run program with arguments ... opens test schema
gradle myRun -PmyArgs="-m,src/test/resources/schemas/ProcessDataEvent.json"

# complex example for debug mode run
gradle myRun -PDEBUG -PmyArgs="-o,/tmp/test_beans,-m,src/test/resources/test_schemas/multiType.json,\

# complex example without debug mode run
gradle myRun -PmyArgs="-o,/tmp/test_beans,-m,src/test/resources/test_schemas/multiType.json,\

Usage of the release

After you built a release with gradle or you download a release bundle you can start the program with the contained start script. If you start it with the help option you get a full description of the possible parameters

# or a similar path
cd build/release
# start program in bash environment

# show help in bash environment
./ --help

# example swagger call
build/release/ -g swagger -o ~/tmp -m src/test/resources/test_schemas/ds/user.json \
  -gp removeEmptyLines=true -gp

To get a better understanding how the program works see here

Program design

Basic class design

Diagram source (main structure) describes the basic design.


see here