Ignore unloadable includes rather than failing

Fixes gh-48981

core/spring-boot-test/src/main/java/org/springframework/boot/test/context/filter/annotation/TypeIncludes.java

@@ -27,10 +27,13 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.jspecify.annotations.Nullable;
 
 import org.springframework.boot.context.TypeExcludeFilter;
 import org.springframework.core.io.UrlResource;
+import org.springframework.core.log.LogMessage;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 
@@ -49,6 +52,8 @@ final class TypeIncludes implements Iterable<Class<?>> {
 
 	private static final String COMMENT_START = "#";
 
+	private static final Log logger = LogFactory.getLog(TypeIncludes.class);
+
 	private final Set<Class<?>> includes;
 
 	private TypeIncludes(Set<Class<?>> includes) {
@@ -111,7 +116,8 @@ final class TypeIncludes implements Iterable<Class<?>> {
 				includes.add(ClassUtils.forName(includeName, classLoader));
 			}
 			catch (Exception ex) {
-				throw new IllegalArgumentException("Failed to load include '" + includeName + "' declared in " + url);
+				logger.debug(LogMessage.format("Include '%s' declared in '%s' could not be loaded and has been ignored",
+						includeName, url), ex);
 			}
 		}
 		return includes;

core/spring-boot-test/src/test/java/org/springframework/boot/test/context/filter/annotation/TypeIncludesTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-present 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.test.context.filter.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.testsupport.classpath.resources.WithResource;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link TypeIncludes}.
+ *
+ * @author Moritz Halbritter
+ */
+class TypeIncludesTests {
+
+	private static final String IMPORTS_FILE = "META-INF/spring/org.springframework.boot.test.context.filter.annotation.TypeIncludesTests$TestAnnotation.includes";
+
+	@Test
+	@WithResource(name = IMPORTS_FILE, content = """
+			org.springframework.boot.test.context.filter.annotation.TypeIncludesTests
+			org.springframework.boot.test.context.filter.annotation.DoesNotExist
+			""")
+	void loadReadsFromClasspathFileIgnoringNonExistentIncludes() {
+		TypeIncludes candidates = TypeIncludes.load(TestAnnotation.class,
+				Thread.currentThread().getContextClassLoader());
+		assertThat(candidates).containsExactly(TypeIncludesTests.class);
+	}
+
+	@Target(ElementType.TYPE)
+	@Retention(RetentionPolicy.RUNTIME)
+	public @interface TestAnnotation {
+
+	}
+
+}