Failure to process a bean definition ahead-of-time with an instance supplier should provide more contextual information #32775
Description
If AOT fails to generate the code, it doesn't provide enough context to track down the problem.
Here's an example:
Exception in thread "main" java.lang.IllegalStateException: Default code generation is not supported for bean definitions declaring an instance supplier callback: Root bean: class [null]; scope=singleton; abstract=false; lazyInit=null; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodNames=null; destroyMethodNames=null at org.springframework.beans.factory.aot.DefaultBeanRegistrationCodeFragments.getTarget(DefaultBeanRegistrationCodeFragments.java:83) at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.generateBeanDefinitionMethod(BeanDefinitionMethodGenerator.java:85) at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.lambda$generateRegisterBeanDefinitionsMethod$2(BeanRegistrationsAotContribution.java:90) at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.generateRegisterBeanDefinitionsMethod(BeanRegistrationsAotContribution.java:88) at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.lambda$applyTo$1(BeanRegistrationsAotContribution.java:73) at org.springframework.aot.generate.GeneratedMethod.<init>(GeneratedMethod.java:54) at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:112) at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:89) at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.applyTo(BeanRegistrationsAotContribution.java:72) at org.springframework.context.aot.BeanFactoryInitializationAotContributions.applyTo(BeanFactoryInitializationAotContributions.java:78) at org.springframework.context.aot.ApplicationContextAotGenerator.lambda$processAheadOfTime$0(ApplicationContextAotGenerator.java:58) at org.springframework.context.aot.ApplicationContextAotGenerator.withCglibClassHandler(ApplicationContextAotGenerator.java:67) at org.springframework.context.aot.ApplicationContextAotGenerator.processAheadOfTime(ApplicationContextAotGenerator.java:53) at org.springframework.context.aot.ContextAotProcessor.performAotProcessing(ContextAotProcessor.java:106) at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:84) at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:49) at org.springframework.context.aot.AbstractAotProcessor.process(AbstractAotProcessor.java:82) at org.springframework.boot.SpringApplicationAotProcessor.main(SpringApplicationAotProcessor.java:80)