spring-projects/spring-framework · error · AotBeanProcessingException

failed to generate code for bean definition

Error message

failed to generate code for bean definition

What it means

A catch-all in BeanRegistrationsAotContribution: while generating the AOT registration code for an individual bean, any Exception that is not an AotException is wrapped in AotBeanProcessingException with this generic message. The real cause is attached; the message itself just says AOT code generation failed for that bean definition.

Source

Thrown at spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanRegistrationsAotContribution.java:280

			});
		}


		private void generateRegisterBeanDefinitionMethods(MethodSpec.Builder method,
				Iterable<Registration> registrations) {

			CodeBlock.Builder code = CodeBlock.builder();
			registrations.forEach(registration -> {
				try {
					CodeBlock methodInvocation = generateBeanRegistration(registration);
					code.addStatement("$L.registerBeanDefinition($S, $L)",
							BEAN_FACTORY_PARAMETER_NAME, registration.beanName(), methodInvocation);
				}
				catch (AotException ex) {
					throw ex;
				}
				catch (Exception ex) {
					throw new AotBeanProcessingException(registration.registeredBean,
							"failed to generate code for bean definition", ex);
				}
			});
			method.addCode(code.build());
		}

		private CodeBlock generateBeanRegistration(Registration registration) {
			MethodReference beanDefinitionMethod = registration.methodGenerator
					.generateBeanDefinitionMethod(this.generationContext, this.codeGenerator);
			return beanDefinitionMethod.toInvokeCodeBlock(
					ArgumentCodeGenerator.none(), this.codeGenerator.getClassName());
		}
	}

}

View on GitHub (pinned to e8729d0438)

Solutions

1. Read the cause of the AotBeanProcessingException - it carries the specific failure to fix.
2. Identify the bean named in the exception and inspect its definition (factory method, constructor, overrides).
3. Address the root cause (unsupported feature, missing class, signature mismatch) per the cause's own message.
4. If unavoidable, exclude the bean from AOT or make it AOT-friendly (static factory method, no instance supplier).

try {
  SpringApplication.run(App.class, args);
} catch (AotBeanProcessingException ex) {
  Throwable cause = ex.getCause();
  log.error("AOT failed for bean [{}]: {}", ex.getBeanName(), cause);
  // dispatch on cause type (missing class, unsupported override, instance supplier...)
  throw ex;
}

When it happens

Trigger: Any unhandled exception during generateBeanRegistration -> generateBeanDefinitionMethod for a specific registered bean during the AOT phase. The underlying exception (cause) identifies the precise sub-failure.

Common situations: Composite symptom of another AOT issue (e.g. errors 207/208/212 propagating). Often seen when a bean uses features the AOT engine cannot serialize to code. The bean name in AotBeanProcessingException points at the offending bean.

Related errors

• Argument type mismatch: expected '{}' for value [{}]
• Failed to load Class [{}] from ClassLoader [{}]
• Unexpected MethodOverride subclass: {}
• Unsupported executable: {}
• {} cannot be found on {}

AI-assisted analysis of spring-projects/spring-framework@e8729d0438 (2026-08-04). Data as JSON: /data/errors/e0581ca8f229e84b.json. Report an issue: GitHub.