From 303a8f0825e4142644ee64f0771bfd2bba84c560 Mon Sep 17 00:00:00 2001
From: Moritz Halbritter <mkammerer@vmware.com>
Date: Mon, 25 Sep 2023 10:53:27 +0200
Subject: [PATCH 1/2] Disable 'LombokGetterMayBeUsed' inspection

---
 .idea/inspectionProfiles/Project_Default.xml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 1ec9e6600d..7f1766dd1b 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -1,6 +1,7 @@
 <component name="InspectionProjectProfileManager">
   <profile version="1.0">
     <option name="myName" value="Project Default" />
+    <inspection_tool class="LombokGetterMayBeUsed" enabled="false" level="WARNING" enabled_by_default="false" />
     <inspection_tool class="UnqualifiedFieldAccess" enabled="true" level="ERROR" enabled_by_default="true" editorAttributes="ERRORS_ATTRIBUTES" />
   </profile>
 </component>
\ No newline at end of file

From b266ade00ccba1d89d17f67b4599d6848abaa998 Mon Sep 17 00:00:00 2001
From: Moritz Halbritter <mkammerer@vmware.com>
Date: Mon, 25 Sep 2023 11:39:04 +0200
Subject: [PATCH 2/2] Prevent exception when loading optional config data
 locations

Closes gh-35683
---
 .../StandardConfigDataLocationResolver.java   |  3 +++
 ...andardConfigDataLocationResolverTests.java | 25 +++++++++++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java
index fb7e6e56e1..3aefc5151f 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java
@@ -226,6 +226,9 @@ public class StandardConfigDataLocationResolver
 				return Collections.singleton(reference);
 			}
 		}
+		if (configDataLocation.isOptional()) {
+			return Collections.emptySet();
+		}
 		throw new IllegalStateException("File extension is not known to any PropertySourceLoader. "
 				+ "If the location is meant to reference a directory, it must end in '/' or File.separator");
 	}
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLocationResolverTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLocationResolverTests.java
index ef5c877799..78c6f1ccaa 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLocationResolverTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLocationResolverTests.java
@@ -43,18 +43,19 @@ import static org.mockito.Mockito.mock;
  *
  * @author Madhura Bhave
  * @author Phillip Webb
+ * @author Moritz Halbritter
  */
 class StandardConfigDataLocationResolverTests {
 
 	private StandardConfigDataLocationResolver resolver;
 
-	private ConfigDataLocationResolverContext context = mock(ConfigDataLocationResolverContext.class);
+	private final ConfigDataLocationResolverContext context = mock(ConfigDataLocationResolverContext.class);
 
 	private MockEnvironment environment;
 
 	private Binder environmentBinder;
 
-	private ResourceLoader resourceLoader = new DefaultResourceLoader();
+	private final ResourceLoader resourceLoader = new DefaultResourceLoader();
 
 	@BeforeEach
 	void setup() {
@@ -260,6 +261,26 @@ class StandardConfigDataLocationResolverTests {
 		assertThat(locations).isEmpty();
 	}
 
+	@Test
+	void resolveWhenOptionalAndLoaderIsUnknownShouldNotFail() {
+		ConfigDataLocation location = ConfigDataLocation.of("optional:some-unknown-loader:dummy.properties");
+		assertThatNoException().isThrownBy(() -> this.resolver.resolve(this.context, location));
+	}
+
+	@Test
+	void resolveWhenOptionalAndLoaderIsUnknownAndExtensionIsUnknownShouldNotFail() {
+		ConfigDataLocation location = ConfigDataLocation
+			.of("optional:some-unknown-loader:dummy.some-unknown-extension");
+		List<StandardConfigDataResource> locations = this.resolver.resolve(this.context, location);
+		assertThatNoException().isThrownBy(() -> this.resolver.resolve(this.context, location));
+	}
+
+	@Test
+	void resolveWhenOptionalAndExtensionIsUnknownShouldNotFail() {
+		ConfigDataLocation location = ConfigDataLocation.of("optional:file:dummy.some-unknown-extension");
+		assertThatNoException().isThrownBy(() -> this.resolver.resolve(this.context, location));
+	}
+
 	private String filePath(String... components) {
 		return "file [" + String.join(File.separator, components) + "]";
 	}