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ConditionalOnClass not working for Bean methods on Java 8 #27846
ConditionalOnClass not working for Bean methods on Java 8 #27846
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When I have the following auto configuration
@Configuration public class DemoAutoConfiguration < @Bean @ConditionalOnClass(DemoCommandLineRunner.class) public CommandLineRunner demoCommandLineRunner() < return new DemoCommandLineRunner(); >> My application cannot start on Java 8 due to
On Java 11 this problem is not there. The return type is not the same as the one in ConditionalOnClass .
This is clearly some kind of difference in the way annotations are loaded in Java 8 vs Java 11.
I am creating this here in case there is something that could be done in Spring Boot or Spring Core that would fix this behaviour between Java 8 and Java 11.
I have also created a minimal project that can be used to see this problem. The project is located here
The text was updated successfully, but these errors were encountered:
Thanks for the link to the other issue @mbhave. I didn’t find that one.
I’ve read the Javadoc and I thought that it is more linked towards the return type being available when the class is loaded. However, in this case the return type is available. The class can be safely loaded. The problem is then the Spring Core AnnotationsScanner .
Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724) ~[na:1.8.0_292] at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531) ~[na:1.8.0_292] at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355) ~[na:1.8.0_292] at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286) ~[na:1.8.0_292] at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120) ~[na:1.8.0_292] at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72) ~[na:1.8.0_292] at java.lang.reflect.Executable.declaredAnnotations(Executable.java:602) ~[na:1.8.0_292] at java.lang.reflect.Executable.declaredAnnotations(Executable.java:600) ~[na:1.8.0_292] at java.lang.reflect.Executable.getDeclaredAnnotations(Executable.java:588) ~[na:1.8.0_292] at java.lang.reflect.Method.getDeclaredAnnotations(Method.java:630) ~[na:1.8.0_292] at org.springframework.core.annotation.AnnotationsScanner.getDeclaredAnnotations(AnnotationsScanner.java:454) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.AnnotationsScanner.isKnownEmpty(AnnotationsScanner.java:492) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.TypeMappedAnnotations.from(TypeMappedAnnotations.java:251) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.MergedAnnotations.from(MergedAnnotations.java:351) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.MergedAnnotations.from(MergedAnnotations.java:330) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.AnnotatedElementUtils.findAnnotations(AnnotatedElementUtils.java:764) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.core.annotation.AnnotatedElementUtils.hasAnnotation(AnnotatedElementUtils.java:531) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.context.annotation.BeanAnnotationHelper.isBeanAnnotated(BeanAnnotationHelper.java:41) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.isMatch(ConfigurationClassEnhancer.java:407) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassEnhancer$ConditionalCallbackFilter.accept(ConfigurationClassEnhancer.java:192) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.cglib.proxy.Enhancer.emitMethods(Enhancer.java:1217) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:726) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.3.9.jar:5.3.9] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_292] at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:419) ~[spring-core-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:447) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:268) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:325) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:147) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) ~[spring-context-5.3.9.jar:5.3.9] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.4.jar:2.5.4] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.4.jar:2.5.4] at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.4.jar:2.5.4] at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123) ~[spring-boot-test-2.5.4.jar:2.5.4] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) ~[spring-test-5.3.9.jar:5.3.9] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-5.3.9.jar:5.3.9] . 68 common frames omitted Most likely there is not much you can do, perhaps the only thing would be to update the Javadoc to mention that @ConditionalClass shouldn’t really be used on @Bean methods when you want your application to run on Java 8.