Adjusted according to review

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

@@ -98,7 +98,7 @@ public class BaseJpaRestfulServer extends RestfulServer {
   ApplicationContext myApplicationContext;
 
   @Autowired(required = false)
-  RepositoryValidationInterceptorFactoryR4 factory;
+  IRepositoryValidationInterceptorFactory factory;
 
   public BaseJpaRestfulServer() {
 
@@ -354,7 +354,7 @@ public class BaseJpaRestfulServer extends RestfulServer {
     if (appProperties.getImplementationGuides() != null) {
       Map<String, AppProperties.ImplementationGuide> guides = appProperties.getImplementationGuides();
       for (Map.Entry<String, AppProperties.ImplementationGuide> guide : guides.entrySet()) {
-			PackageInstallOutcomeJson outcome = packageInstallerSvc.install(new PackageInstallationSpec()
+			packageInstallerSvc.install(new PackageInstallationSpec()
 				.setPackageUrl(guide.getValue().getUrl())
 				.setName(guide.getValue().getName())
 				.setVersion(guide.getValue().getVersion())
@@ -363,9 +363,9 @@ public class BaseJpaRestfulServer extends RestfulServer {
       }
     }
 
-    if(factory != null)
+    if(factory != null) {
 		 interceptorService.registerInterceptor(factory.buildUsingStoredStructureDefinitions());
-
+	 }
 
 
     if (appProperties.getLastn_enabled()) {

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

@@ -0,0 +1,9 @@
+package ca.uhn.fhir.jpa.starter;
+
+import ca.uhn.fhir.jpa.interceptor.validation.RepositoryValidatingInterceptor;
+
+public interface IRepositoryValidationInterceptorFactory {
+	RepositoryValidatingInterceptor buildUsingStoredStructureDefinitions();
+
+	RepositoryValidatingInterceptor build();
+}

src/main/java/ca/uhn/fhir/jpa/starter/RepositoryValidationInterceptorFactoryDstu3.java

@@ -29,7 +29,7 @@ import java.util.stream.Collectors;
 @ConditionalOnProperty(prefix = "hapi.fhir", name = "enable_repository_validating_interceptor", havingValue = "true")
 @Configuration
 @Conditional(OnDSTU3Condition.class)
-public class RepositoryValidationInterceptorFactoryDstu3 {
+public class RepositoryValidationInterceptorFactoryDstu3 implements IRepositoryValidationInterceptorFactory {
 
 	private final FhirContext fhirContext;
 	private final RepositoryValidatingRuleBuilder repositoryValidatingRuleBuilder;

src/main/java/ca/uhn/fhir/jpa/starter/RepositoryValidationInterceptorFactoryR4.java

@@ -29,7 +29,7 @@ import java.util.stream.Collectors;
 @ConditionalOnProperty(prefix = "hapi.fhir", name = "enable_repository_validating_interceptor", havingValue = "true")
 @Configuration
 @Conditional(OnR4Condition.class)
-public class RepositoryValidationInterceptorFactoryR4 {
+public class RepositoryValidationInterceptorFactoryR4 implements IRepositoryValidationInterceptorFactory {
 
 	private final FhirContext fhirContext;
 	private final RepositoryValidatingRuleBuilder repositoryValidatingRuleBuilder;
@@ -42,6 +42,7 @@ public class RepositoryValidationInterceptorFactoryR4 {
 
 	}
 
+	@Override
 	public RepositoryValidatingInterceptor buildUsingStoredStructureDefinitions() {
 
 		IBundleProvider results = structureDefinitionResourceProvider.search(new SearchParameterMap().add(StructureDefinition.SP_KIND, new TokenParam("resource")));
@@ -60,6 +61,7 @@ public class RepositoryValidationInterceptorFactoryR4 {
 		return new RepositoryValidatingInterceptor(fhirContext, rules);
 	}
 
+	@Override
 	public RepositoryValidatingInterceptor build() {
 
 		// Customize the ruleBuilder here to have the rules you want! We will give a simple example

src/main/java/ca/uhn/fhir/jpa/starter/RepositoryValidationInterceptorFactoryR5.java

@@ -29,7 +29,7 @@ import java.util.stream.Collectors;
 @ConditionalOnProperty(prefix = "hapi.fhir", name = "enable_repository_validating_interceptor", havingValue = "true")
 @Configuration
 @Conditional(OnR5Condition.class)
-public class RepositoryValidationInterceptorFactoryR5 {
+public class RepositoryValidationInterceptorFactoryR5 implements IRepositoryValidationInterceptorFactory {
 
 	private final FhirContext fhirContext;
 	private final RepositoryValidatingRuleBuilder repositoryValidatingRuleBuilder;