Allow loading of YAML files bigger than 3 MB

Closes gh-34743

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/OriginTrackedYamlLoader.java

@@ -67,6 +67,7 @@ class OriginTrackedYamlLoader extends YamlProcessor {
 		loaderOptions.setAllowDuplicateKeys(false);
 		loaderOptions.setMaxAliasesForCollections(Integer.MAX_VALUE);
 		loaderOptions.setAllowRecursiveKeys(true);
+		loaderOptions.setCodePointLimit(Integer.MAX_VALUE);
 		return createYaml(loaderOptions);
 	}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/env/OriginTrackedYamlLoaderTests.java

@@ -182,6 +182,18 @@ class OriginTrackedYamlLoaderTests {
 		assertThat(loaded.get("some.anotherpath.config.key")).hasToString("value");
 	}
 
+	@Test
+	void canLoadFilesBiggerThan3Mb() {
+		StringBuilder yaml = new StringBuilder();
+		while (yaml.length() < 4_194_304) {
+			yaml.append("- some list entry\n");
+		}
+		Resource resource = new ByteArrayResource(yaml.toString().getBytes(StandardCharsets.UTF_8));
+		this.loader = new OriginTrackedYamlLoader(resource);
+		Map<String, Object> loaded = this.loader.load().get(0);
+		assertThat(loaded).isNotEmpty();
+	}
+
 	private OriginTrackedValue getValue(String name) {
 		if (this.result == null) {
 			this.result = this.loader.load();