feat: Add compensation workflow pattern to Spring Boot examples

[siri-varma]

Port the BookTrip compensation (Saga) workflow from the plain Java examples into the Spring Boot workflow patterns module, adding @Component-annotated activities and a /wfp/compensation REST endpoint.

Description

Please explain the changes you've made

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1395

#1395

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

Adds a Spring Boot “compensation / Saga” workflow pattern example (BookTrip) to the workflows/patterns module, along with a REST endpoint to trigger it.

Changes:

• Introduces BookTripWorkflow implementing a simple saga with compensating activities.
• Adds booking and cancellation workflow activities as Spring components.
• Exposes a new POST /wfp/compensation endpoint to run the workflow and return its output.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelHotelActivity.java	Adds hotel-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelFlightActivity.java	Adds flight-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelCarActivity.java	Adds car-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookTripWorkflow.java	Implements saga-style orchestration with compensation retries
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookHotelActivity.java	Adds hotel booking activity used by the workflow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookFlightActivity.java	Adds flight booking activity used by the workflow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookCarActivity.java	Adds car booking activity that intentionally fails to trigger compensation
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/WorkflowPatternsRestController.java	Adds POST /wfp/compensation endpoint to run the new workflow

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[salaboy]

@siri-varma I am a bit against this way of doing compensations, that's why I've created this example: https://github.com/diagrid-labs/workflow-patterns-spring-boot?tab=readme-ov-file#compensate-on-error-example I think that having an arraylist inside the workflow itself is a hack and should be avoided.

Check this specifically: https://github.com/diagrid-labs/workflow-patterns-spring-boot/blob/main/workflows/src/main/java/io/dapr/springboot/workflows/compensateonerror/CompensateWhenErrorWorkflow.java#L40

Check the example and let me know if you have any questions, I would rather have an example following that approach in the SDK than a port from other languages.

[salaboy]

Check my comment in the PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.77%. Comparing base (e289298) to head (9e23307).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1696   +/-   ##
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  Coverage     76.77%   76.77%           
  Complexity     2259     2259           
=========================================
  Files           241      241           
  Lines          7066     7066           
  Branches        740      740           
=========================================
  Hits           5425     5425           
  Misses         1277     1277           
  Partials        364      364           

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[siri-varma]

@javier-aliaga, @salaboy addressed all the comments on this PR

[Copilot]

Pull request overview

Adds a Spring Boot version of the “BookTrip” compensation (Saga) workflow pattern to the workflow patterns example app, and refactors the plain Java compensation example to reduce duplicated compensation logic.

Changes:

• Introduces BookTripWorkflow plus booking/cancellation activities as Spring components under wfp/compensation.
• Exposes a new POST /wfp/compensation endpoint to run the compensation demo workflow in the Spring Boot patterns app.
• Refactors the non-Spring “examples” compensation workflow to use a new CompensationHelper.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelHotelActivity.java	Adds hotel cancellation activity for compensation demo.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelFlightActivity.java	Adds flight cancellation activity for compensation demo.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelCarActivity.java	Adds car cancellation activity for compensation demo.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookTripWorkflow.java	Adds Spring Boot orchestration implementing compensation logic + retries for compensations.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookHotelActivity.java	Adds hotel booking activity for compensation demo.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookFlightActivity.java	Adds flight booking activity for compensation demo.
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookCarActivity.java	Adds car booking activity (forces failure to demonstrate compensation).
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/WorkflowPatternsRestController.java	Adds POST /wfp/compensation endpoint to run the new workflow.
examples/src/main/java/io/dapr/examples/workflows/compensation/CompensationHelper.java	Adds helper to register and execute compensations in reverse order.
examples/src/main/java/io/dapr/examples/workflows/compensation/BookTripWorkflow.java	Refactors plain Java example to use CompensationHelper for compensation execution.

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