Do not further process imports of Object.class

This commit filters out source classes that didn't pass a predicate
filter so that they are no longer considered.

Closes gh-27080

Author: snicoll

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -670,7 +670,10 @@ SourceClass asSourceClass(@Nullable Class<?> classType, Predicate<String> filter
 	private Collection<SourceClass> asSourceClasses(String[] classNames, Predicate<String> filter) throws IOException {
 		List<SourceClass> annotatedClasses = new ArrayList<>(classNames.length);
 		for (String className : classNames) {
-			annotatedClasses.add(asSourceClass(className, filter));
+			SourceClass sourceClass = asSourceClass(className, filter);
+			if (this.objectSourceClass != sourceClass) {
+				annotatedClasses.add(sourceClass);
+			}
 		}
 		return annotatedClasses;
 	}

spring-context/src/test/java/org/springframework/context/annotation/ImportSelectorTests.java

@@ -91,6 +91,17 @@ void importSelectors() {
 		ordered.verify(beanFactory).registerBeanDefinition(eq("c"), any());
 	}
 
+	@Test
+	void filteredImportSelector() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+		context.register(FilteredConfig.class);
+		context.refresh();
+		String[] beanNames = context.getBeanFactory().getBeanDefinitionNames();
+		assertThat(beanNames).endsWith("importSelectorTests.FilteredConfig",
+				ImportedSelector2.class.getName(), "b");
+		assertThat(beanNames).doesNotContain(Object.class.getName());
+	}
+
 	@Test
 	void invokeAwareMethodsInImportSelector() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AwareConfig.class);
@@ -274,6 +285,25 @@ public String[] selectImports(AnnotationMetadata importingClassMetadata) {
 		}
 	}
 
+	@Configuration
+	@Import(FilteredImportSelector.class)
+	public static class FilteredConfig {
+	}
+
+	public static class FilteredImportSelector implements ImportSelector {
+
+		@Override
+		public String[] selectImports(AnnotationMetadata importingClassMetadata) {
+			return new String[] { ImportedSelector1.class.getName(), ImportedSelector2.class.getName(), ImportedSelector3.class.getName() };
+		}
+
+		@Override
+		public Predicate<String> getExclusionFilter() {
+			return (className -> className.equals(ImportedSelector1.class.getName()) ||
+					className.equals(ImportedSelector3.class.getName()));
+		}
+	}
+
 
 	public static class DeferredImportSelector1 implements DeferredImportSelector, Ordered {
 
@@ -320,6 +350,15 @@ public String b() {
 		}
 	}
 
+	@Configuration
+	public static class ImportedSelector3 {
+
+		@Bean
+		public String c() {
+			return "c";
+		}
+	}
+
 
 	@Configuration
 	public static class DeferredImportedSelector1 {