diff --git a/saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilter.java b/saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilter.java
index d72d6772e8..84c7e20332 100644
--- a/saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilter.java
+++ b/saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilter.java
@@ -63,6 +63,16 @@ public final class Saml2MetadataFilter extends OncePerRequestFilter {
 		this.saml2MetadataResolver = saml2MetadataResolver;
 	}
 
+	/**
+	 * Constructs an instance of {@link Saml2MetadataFilter} using the provided
+	 * parameters. The {@link #relyingPartyRegistrationResolver} field will be initialized
+	 * with a {@link DefaultRelyingPartyRegistrationResolver} instance using the provided
+	 * {@link RelyingPartyRegistrationRepository}
+	 * @param relyingPartyRegistrationRepository the
+	 * {@link RelyingPartyRegistrationRepository} to use
+	 * @param saml2MetadataResolver the {@link Saml2MetadataResolver} to use
+	 * @since 6.1
+	 */
 	public Saml2MetadataFilter(RelyingPartyRegistrationRepository relyingPartyRegistrationRepository,
 			Saml2MetadataResolver saml2MetadataResolver) {
 		this(new DefaultRelyingPartyRegistrationResolver(relyingPartyRegistrationRepository), saml2MetadataResolver);
diff --git a/saml2/saml2-service-provider/src/test/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilterTests.java b/saml2/saml2-service-provider/src/test/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilterTests.java
index a8fc1cdaae..3c5771e86e 100644
--- a/saml2/saml2-service-provider/src/test/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilterTests.java
+++ b/saml2/saml2-service-provider/src/test/java/org/springframework/security/saml2/provider/service/web/Saml2MetadataFilterTests.java
@@ -33,6 +33,7 @@ import org.springframework.security.saml2.provider.service.registration.RelyingP
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
 import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
+import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
@@ -137,7 +138,7 @@ public class Saml2MetadataFilterTests {
 	}
 
 	@Test
-	public void doFilterWhenPathStartsWithRegistrationIdThenServesMetadata() throws Exception {
+	public void doFilterWhenResolverConstructorAndPathStartsWithRegistrationIdThenServesMetadata() throws Exception {
 		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
 		given(this.repository.findByRegistrationId("registration-id")).willReturn(registration);
 		given(this.resolver.resolve(any())).willReturn("metadata");
@@ -151,16 +152,17 @@ public class Saml2MetadataFilterTests {
 	}
 
 	@Test
-	public void doFilterWhenPathStartsWithOneThenServesMetadata() throws Exception {
+	public void doFilterWhenRelyingPartyRegistrationRepositoryConstructorAndPathStartsWithRegistrationIdThenServesMetadata()
+			throws Exception {
 		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
-		given(this.repository.findByRegistrationId("one")).willReturn(registration);
+		given(this.repository.findByRegistrationId("registration-id")).willReturn(registration);
 		given(this.resolver.resolve(any())).willReturn("metadata");
-		this.filter = new Saml2MetadataFilter((id) -> this.repository.findByRegistrationId("one"),
+		this.filter = new Saml2MetadataFilter((id) -> this.repository.findByRegistrationId("registration-id"),
 				this.resolver);
 		this.filter.setRequestMatcher(new AntPathRequestMatcher("/metadata"));
 		this.request.setPathInfo("/metadata");
 		this.filter.doFilter(this.request, this.response, new MockFilterChain());
-		verify(this.repository).findByRegistrationId("one");
+		verify(this.repository).findByRegistrationId("registration-id");
 	}
 
 	// gh-12026
@@ -196,4 +198,14 @@ public class Saml2MetadataFilterTests {
 				.withMessage("metadataFilename must contain a {registrationId} match variable");
 	}
 
+	@Test
+	public void constructorWhenRelyingPartyRegistrationRepositoryThenUses() {
+		RelyingPartyRegistrationRepository repository = mock(RelyingPartyRegistrationRepository.class);
+		this.filter = new Saml2MetadataFilter(repository, this.resolver);
+		DefaultRelyingPartyRegistrationResolver relyingPartyRegistrationResolver = (DefaultRelyingPartyRegistrationResolver) ReflectionTestUtils
+				.getField(this.filter, "relyingPartyRegistrationResolver");
+		relyingPartyRegistrationResolver.resolve(this.request, "one");
+		verify(repository).findByRegistrationId("one");
+	}
+
 }