Update following properties with your PostgresDB configurations

spring.r2dbc.url=${POSTGRES_URL:r2dbc:postgresql://localhost:5432/problem_webflux_db} spring.r2dbc.username=${POSTGRES_USER:postgres} spring.r2dbc.password=${POSTGRES_USER:admin} spring.flyway.url=${POSTGRES_URL:jdbc:postgresql://localhost:5432/problem_webflux_db} spring.flyway.user=${POSTGRES_USER:postgres} spring.flyway.password=${POSTGRES_PASSWORD:admin}

Update following properties with your MongoDB configurations

spring.data.mongodb.uri=${MONGODB_URL:mongodb://localhost:27017/problem_web_db}

Run the main class ProblemWebFluxDemoApplication and access Swagger Swagger at http://localhost:8080/swagger-ui.html

Select Application from dropdown Select a definition

• State management APIs are using MongoDB, to test database constraint violations.
• Employee management APIs are using PostgresDB, to test database constraint violations.
• Problem Demo APIs throws exceptions explicitly. Have a look at DemoProblemController
• State and Employee management APIs are secured, so need to pass a JWT token in Authorization header. See the lock symbol against the API in Swagger

Click on Authorize button to pass the JWT Token. Use following as JWT Token.

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c 

• Call the APIs providing invalid inputs to make it throw exception and have a look at response.
• Set problem.debug-enabled=true in application.properties to get the message resolvers and set the messages in errors.properties to customize the error response attributes in response.
• Test with setting problem.stacktrace-enabled=true and problem.cause-chains-enabled=true in application.properties to get Stacktrace and Cause in response.
• Update help.html with any custom error description and follow the type url in error response to see the error description on help page.