add property to turn on userRequestRetryVersionConflictsInterceptor (#752)

src/main/java/ca/uhn/fhir/jpa/starter/AppProperties.java

@@ -106,8 +106,9 @@ public class AppProperties {
 	private final List<String> custom_provider_classes = new ArrayList<>();
 	private Boolean upliftedRefchains_enabled = false;
 
-	private List<Integer> search_prefetch_thresholds = new ArrayList<>();
+	private boolean userRequestRetryVersionConflictsInterceptorEnabled = false;
 
+	private List<Integer> search_prefetch_thresholds = new ArrayList<>();
 
 	public List<String> getCustomInterceptorClasses() {
     return custom_interceptor_classes;
@@ -671,6 +672,14 @@ public Cors getCors() {
 		this.upliftedRefchains_enabled = upliftedRefchains_enabled;
 	}
 
+	public Boolean getUserRequestRetryVersionConflictsInterceptorEnabled() {
+		return userRequestRetryVersionConflictsInterceptorEnabled;
+	}
+
+	public void setUserRequestRetryVersionConflictsInterceptorEnabled(Boolean userRequestRetryVersionConflictsInterceptorEnabled) {
+		this.userRequestRetryVersionConflictsInterceptorEnabled = userRequestRetryVersionConflictsInterceptorEnabled;
+	}
+
 	public static class Cors {
     private Boolean allow_Credentials = true;
     private List<String> allowed_origin = List.of("*");
@@ -690,8 +699,6 @@ public Cors getCors() {
     public void setAllow_Credentials(Boolean allow_Credentials) {
       this.allow_Credentials = allow_Credentials;
     }
-
-
   }
 
   public static class Logger {

src/main/java/ca/uhn/fhir/jpa/starter/common/StarterJpaConfig.java

@@ -28,6 +28,7 @@ import ca.uhn.fhir.jpa.dao.search.IHSearchSortHelper;
 import ca.uhn.fhir.jpa.delete.ThreadSafeResourceDeleterSvc;
 import ca.uhn.fhir.jpa.graphql.GraphQLProvider;
 import ca.uhn.fhir.jpa.interceptor.CascadingDeleteInterceptor;
+import ca.uhn.fhir.jpa.interceptor.UserRequestRetryVersionConflictsInterceptor;
 import ca.uhn.fhir.jpa.interceptor.validation.RepositoryValidatingInterceptor;
 import ca.uhn.fhir.jpa.ips.provider.IpsOperationProvider;
 import ca.uhn.fhir.jpa.model.config.SubscriptionSettings;
@@ -457,6 +458,10 @@ public class StarterJpaConfig {
 			fhirServer.registerProvider(theIpsOperationProvider.get());
 		}
 
+		if (appProperties.getUserRequestRetryVersionConflictsInterceptorEnabled() ) {
+			fhirServer.registerInterceptor(new UserRequestRetryVersionConflictsInterceptor());
+		}
+
 		// register custom providers
 		registerCustomProviders(fhirServer, appContext, appProperties.getCustomProviderClasses());
 

src/main/resources/application.yaml

@@ -214,6 +214,8 @@ hapi:
     narrative_enabled: false
     mdm_enabled: false
     mdm_rules_json_location: "mdm-rules.json"
+    ##  see: https://hapifhir.io/hapi-fhir/docs/interceptors/built_in_server_interceptors.html#jpa-server-retry-on-version-conflicts
+    #    userRequestRetryVersionConflictsInterceptorEnabled : false
     #    local_base_urls:
     #      - https://hapi.fhir.org/baseR4
     logical_urls: