Add resource hint for banner.txt

Closes gh-32882

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/SpringApplicationBannerPrinter.java

@@ -23,6 +23,8 @@ import java.io.UnsupportedEncodingException;
 
 import org.apache.commons.logging.Log;
 
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
@@ -122,4 +124,13 @@ class SpringApplicationBannerPrinter {
 
 	}
 
+	static class SpringApplicationBannerPrinterRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			hints.resources().registerPattern("banner.txt");
+		}
+
+	}
+
 }

spring-boot-project/spring-boot/src/main/resources/META-INF/spring/aot.factories

@@ -1,5 +1,6 @@
 org.springframework.aot.hint.RuntimeHintsRegistrar=\
 org.springframework.boot.SpringApplication.SpringApplicationRuntimeHints,\
+org.springframework.boot.SpringApplicationBannerPrinter.SpringApplicationBannerPrinterRuntimeHints,\
 org.springframework.boot.WebApplicationType.WebApplicationTypeRuntimeHints,\
 org.springframework.boot.context.config.ConfigDataLocationRuntimeHints,\
 org.springframework.boot.context.config.ConfigDataPropertiesRuntimeHints,\

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationBannerPrinterTests.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringApplicationBannerPrinter}.
+ *
+ * @author Moritz Halbritter
+ */
+class SpringApplicationBannerPrinterTests {
+
+	@Test
+	void shouldRegisterRuntimeHints() {
+		RuntimeHints runtimeHints = new RuntimeHints();
+		new SpringApplicationBannerPrinter.SpringApplicationBannerPrinterRuntimeHints().registerHints(runtimeHints,
+				getClass().getClassLoader());
+		assertThat(RuntimeHintsPredicates.resource().forResource("banner.txt")).accepts(runtimeHints);
+	}
+
+}