DevTools - java.lang.LinkageError: loader constraint violation in interface itable initialization

Trying to use axon-framework with spring boot 2.1.4. When I add spring-boot-devtools dependency I get the following exception:

java.lang.LinkageError: loader constraint violation in interface itable initialization for class org.axonframework.spring.config.AxonConfiguration: when selecting method org.axonframework.config.Configuration.resourceInjector()Lorg/axonframework/modelling/saga/ResourceInjector; the class loader 'app' (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) for super interface org.axonframework.config.Configuration, and the class loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @3acec512 (instance of org.springframework.boot.devtools.restart.classloader.RestartClassLoader, child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) of the selected method's type, org.axonframework.spring.config.AxonConfiguration have different Class objects for the type org.axonframework.modelling.saga.ResourceInjector used in the signature
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method) ~[na:na]
	at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3167) ~[na:na]
	at java.base/java.lang.Class.getDeclaredMethods(Class.java:2310) ~[na:na]
	at org.axonframework.common.ReflectionUtils.methodsOf(ReflectionUtils.java:229) ~[axon-messaging-4.1.1.jar:4.1.1]
	at org.axonframework.spring.config.SpringAxonAutoConfigurer.lambda$registerEventHandlerRegistrar$42(SpringAxonAutoConfigurer.java:254) ~[axon-spring-4.1.1.jar:4.1.1]
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133) ~[na:na]
	at org.axonframework.spring.config.SpringAxonAutoConfigurer.registerEventHandlerRegistrar(SpringAxonAutoConfigurer.java:248) ~[axon-spring-4.1.1.jar:4.1.1]
	at org.axonframework.spring.config.SpringAxonAutoConfigurer.registerBeanDefinitions(SpringAxonAutoConfigurer.java:214) ~[axon-spring-4.1.1.jar:4.1.1]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:364) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:na]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:363) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:145) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:117) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:327) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at pm.mbo.easyway.api.app.AppApi.main(AppApi.java:10) ~[main/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.1.4.RELEASE.jar:2.1.4.RELEASE]

Found #491 but couldn’t find a way to get around the exception. The only thing that works is removing devtools…

[thydian]

With Spring Boot (I’m currently at 2.1.3) I think I resolved devtools issues by creating a file: /src/main/resources/META-INF/spring-devtools.properties restart.include.modelmapper=/modelmapper-(.*).jar restart.include.axon=/axon-(.*).jar

My project was also adding/getting started with a library called modelmapper which had similar warnings for using Spring Boot Devtools. http://modelmapper.org/user-manual/spring-boot-devtools-integration/

I thought why not try the same workaround for Axon? And so far so good for a number of months now and a few Spring Boot version bumps. I don’t know where this workaround may fall flat for others…

[mborra]

I have the same issue, and I have solved with @thydian workaround.