Fix BaseHapiFhirResourceDao $meta method to use HapiTransactionServic…

…e instead of @transaction (#5896)

* Try making ResourceTable.myTags EAGER instead of LAZY and see if it breaks anything.

* Try making ResourceTable.myTags EAGER instead of LAZY and see if it breaks anything.

* Ensure BaseHapiFhirResourceDao#metaGetOperation uses HapiTransactionService instead of @transactional in order to resolve megascale $meta bug.

* Add changelog.

* Update hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/7_2_0/5898-ld-megascale-meta-operation-fails-hapi-0389.yaml

Commit code reviewer suggestion.

Co-authored-by: Tadgh <garygrantgraham@gmail.com>

---------

Co-authored-by: Tadgh <garygrantgraham@gmail.com>

hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/7_2_0/5898-ld-megascale-meta-operation-fails-hapi-0389.yaml

@@ -0,0 +1,5 @@
+---
+type: fix
+issue: 5898
+title: "Previously, triggering a `$meta` via GET on a new patient with Megascale configured resulted in error HAPI-0389. This has been corrected
+        This has been fixed."

hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/dao/BaseHapiFhirResourceDao.java

@@ -1410,19 +1410,20 @@ public <MT extends IBaseMetaType> MT metaDeleteOperation(
 	}
 
 	@Override
-	@Transactional
 	public <MT extends IBaseMetaType> MT metaGetOperation(Class<MT> theType, IIdType theId, RequestDetails theRequest) {
-		Set<TagDefinition> tagDefs = new HashSet<>();
-		BaseHasResource entity = readEntity(theId, theRequest);
-		for (BaseTag next : entity.getTags()) {
-			tagDefs.add(next.getTag());
-		}
-		MT retVal = toMetaDt(theType, tagDefs);
+		return myTransactionService.withRequest(theRequest).execute(() -> {
+			Set<TagDefinition> tagDefs = new HashSet<>();
+			BaseHasResource entity = readEntity(theId, theRequest);
+			for (BaseTag next : entity.getTags()) {
+				tagDefs.add(next.getTag());
+			}
+			MT retVal = toMetaDt(theType, tagDefs);
 
-		retVal.setLastUpdated(entity.getUpdatedDate());
-		retVal.setVersionId(Long.toString(entity.getVersion()));
+			retVal.setLastUpdated(entity.getUpdatedDate());
+			retVal.setVersionId(Long.toString(entity.getVersion()));
 
-		return retVal;
+			return retVal;
+		});
 	}
 
 	@Override