alibaba/spring-ai-alibaba · error · java.lang.IllegalStateException

parse default-default-application.yml failed

Error message

parse default-default-application.yml failed

What it means

After locating templates/default-application.yml, customize() parses it with SnakeYAML (new Yaml().load(in)). Any parse error — malformed YAML, tabs, invalid structure — is wrapped in IllegalStateException('parse default-default-application.yml failed', ex). This signals a corrupted or hand-edited default template that the generator cannot interpret.

Source

Thrown at spring-ai-alibaba-admin/spring-ai-alibaba-admin-server-start/src/main/java/com/alibaba/cloud/ai/studio/admin/builder/generator/service/generator/GraphAppPropertiesCustomizer.java:44

public class GraphAppPropertiesCustomizer implements ApplicationPropertiesCustomizer {

	public GraphAppPropertiesCustomizer() {
	}

	@Override
	public void customize(ApplicationProperties properties) {
		try (InputStream in = getClass().getClassLoader().getResourceAsStream("templates/default-application.yml")) {
			if (in == null) {
				throw new IllegalStateException("not found default-default-application.yml");
			}
			Yaml yaml = new Yaml();
			Object loaded = yaml.load(in);
			if (loaded instanceof Map<?, ?>) {
				flattenAndAdd(properties, "", (Map<String, Object>) loaded);
			}
		}
		catch (Exception ex) {
			throw new IllegalStateException("parse default-default-application.yml failed", ex);
		}
	}

	@SuppressWarnings("unchecked")
	private void flattenAndAdd(ApplicationProperties props, String prefix, Map<String, Object> map) {
		for (Map.Entry<String, Object> entry : map.entrySet()) {
			String key = prefix.isEmpty() ? entry.getKey() : prefix + "." + entry.getKey();
			Object value = entry.getValue();
			if (value instanceof Map) {
				flattenAndAdd(props, key, (Map<String, Object>) value);
			}
			else if (value instanceof List) {
				props.add(key, ((List<?>) value).toString());
			}
			else if (value instanceof Boolean) {
				props.add(key, (Boolean) value);
			}
			else if (value instanceof Number) {

View on GitHub (pinned to f82da0b50f)

Solutions

1. Validate templates/default-application.yml with a YAML linter or a quick SnakeYAML/J shell parse; fix the reported line from the cause exception
2. Replace tabs with spaces and fix indentation in the template
3. Check whether Maven resource filtering is mangling ${...} placeholders in the YAML — escape them or disable filtering for templates/
4. Restore the original template from the upstream spring-ai-alibaba repository

Example fix

// before (invalid YAML)
application:
	name: demo
// after
application:
  name: demo

try (InputStream in = getClass().getClassLoader().getResourceAsStream("templates/default-application.yml")) {
    new org.yaml.snakeyaml.Yaml().load(in); // throws if invalid
}

try {
    customizer.customize(properties);
} catch (IllegalStateException e) {
    log.error("default-application.yml is invalid YAML: {}", e.getCause(), e);
}

When it happens

Trigger: customize() is invoked and the bundled templates/default-application.yml contains syntactically invalid YAML (bad indentation, tabs, unescaped characters) or a top-level non-map structure causing a cast/parse failure inside the try block.

Common situations: Editing the template file by hand and introducing YAML syntax errors, using tabs instead of spaces, resource filtering placeholders breaking YAML syntax, or a broken merge/rebase of the template.

Related errors

• not found default-default-application.yml
• BuildToolSchemaError
• Type "token" is not allowed.
• Invalid memory parameter
• Invalid iterations parameter

AI-assisted analysis of alibaba/spring-ai-alibaba@f82da0b50f (2026-09-09). Data as JSON: /api/errors/b20b295d4cd135ca. Report an issue: GitHub.