Document $validate operation execution path for Bundle resources

[Copilot]

The problem statement asked what source file gets called when an external service calls $validate on a Bundle resource. This is an investigative question, not a bug fix.

Investigation Results

No code changes required. The $validate operation for Bundle resources follows this execution path:

1. ValidateMethodBindingDstu2Plus - REST layer method binding
2. BaseJpaResourceProvider.validate() - Provider layer with @Validate annotation
3. BaseHapiFhirResourceDao.validate() - DAO layer performing actual validation

Key Files

• hapi-fhir-server/src/main/java/ca/uhn/fhir/rest/server/method/ValidateMethodBindingDstu2Plus.java
• hapi-fhir-storage/src/main/java/ca/uhn/fhir/jpa/provider/BaseJpaResourceProvider.java (lines ~362-373)
• hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/dao/BaseHapiFhirResourceDao.java

The functionality is already implemented and working as designed.

Original prompt

what source file gets called when an external service with a hapi depdendency calls $validate on a Bundle resource?

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