Spring Boot Java 11 missing run time dependencies

Question

Running my Spring boot project in Java 10 and maven everything ran fine. Simply changing the JDK from 10 to 11 introduced the following error

 emailer_1        | java.lang.IllegalStateException: Error processing condition on org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration.reactiveVaultSessionManager
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:64)
    emailer_1        |  at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
    emailer_1        |  at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:181)
    emailer_1        |  at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:141)
    emailer_1        |  at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:117)
    emailer_1        |  at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:327)
    emailer_1        |  at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232)
    emailer_1        |  at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
       | Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration] from ClassLoader [org.springframework.boot.loader.LaunchedURLClassLoader@5d099f62]
    emailer_1        |  at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:680)
    emailer_1        |  at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:577)
    emailer_1        |  at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:562)
    emailer_1        |  at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:620)
    emailer_1        |  at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
    emailer_1        |  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:721)
    emailer_1        |  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:662)
    emailer_1        |  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:630)
    emailer_1        |  at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1491)
    emailer_1        |  at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1014)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanTypeForNonAliasDefinition(BeanTypeRegistry.java:198)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanTypeForNonAliasDefinition(BeanTypeRegistry.java:174)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanType(BeanTypeRegistry.java:167)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.lambda$updateTypesIfNecessary$3(BeanTypeRegistry.java:154)
    emailer_1        |  at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.updateTypesIfNecessary(BeanTypeRegistry.java:152)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.getNamesForType(BeanTypeRegistry.java:118)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.OnBeanCondition.collectBeanNamesForType(OnBeanCondition.java:301)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:290)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchingBeans(OnBeanCondition.java:232)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchOutcome(OnBeanCondition.java:152)
    emailer_1        |  at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47)
    emailer_1        |  ... 36 common frames omitted
   emailer_1        | Caused by: java.lang.ClassNotFoundException: reactor.core.publisher.Mono
    emailer_1        |  at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
    emailer_1        |  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
    emailer_1        |  at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93)
    emailer_1        |  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    emailer_1        |  ... 61 common frames omitted

I am not using the Spring Webflux framework, and have not needed any jars with the reactor framework before. I know Java 11 gutted a lot of the JEE stuff out of the JDK, but this isn't that.

I have tried SpringBoot 2.0.5 release and the latest milestone release (M4) of 2.1 and the results are the same. I have changed the Spring Cloud version from Finchley.SR1 to Greenwich.M1 with the same results.

Has anyone else ran into a similar problem? Any help is greatly appreciated.

Edit: simply adding reactor core to my Pom as a managed dependency causes another issue of it not finding Netty libraries... which is weird because it should be using tomcat.

Spring Boot Java 11 missing run time dependencies

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