Updating to Java 11 causes vault to to not find reactor.netty.http.client.HttpClient

Working project with Java 10, tested with 2.0.5.RELEASE, 2.0.6.RELEASE and 2.1.0.M4 with Spring Cloud Finchley.SR1 and Greenwich.M1. Project works and runs as expected.

Changing only the Java version from 10 to 11 gives the error of

	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:303)
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:284)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1307)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1153)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:848)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:865)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:548)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:797)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:421)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:340)
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:139)
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:197)
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:104)
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:70)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:371)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1291)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1279)
	at com.chg.documentservice.DocumentServiceApplication.main(DocumentServiceApplication.java:10)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration$$EnhancerBySpringCGLIB$$99154ba1]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: reactor/netty/http/client/HttpClient
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:184)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:299)
	... 30 common frames omitted
Caused by: java.lang.NoClassDefFoundError: reactor/netty/http/client/HttpClient
	at org.springframework.vault.config.ClientHttpConnectorFactory.create(ClientHttpConnectorFactory.java:54)
	at org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration.createConnector(VaultReactiveBootstrapConfiguration.java:105)
	at org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration.<init>(VaultReactiveBootstrapConfiguration.java:86)
	at org.springframework.cloud.vault.config.VaultReactiveBootstrapConfiguration$$EnhancerBySpringCGLIB$$99154ba1.<init>(<generated>)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:172)
	... 32 common frames omitted
Caused by: java.lang.ClassNotFoundException: reactor.netty.http.client.HttpClient
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	... 41 common frames omitted

This is not a Webflux project. I understand Java 11 removed certain classes from the JDK, but these are not the classes that were removed.

[mp911de]

Thanks a lot for bringing up the point of a changed Java release schedule. The new release schedule is a challenge on its own. We have here a project that has a quite long dependency chain:

1. Spring Framework is required by all Spring projects as a foundation to be released first as it is required to support a new Java release first.
2. Spring Vault needs to catch up if required.
3. Since Spring Cloud builds on top of Spring Boot, we need a Spring Boot release that picks up Spring Framework for the new Java release
4. Spring Cloud is required to ship a release.

Releases tend to happen in somewhat regular intervals of about a month in between. Let me take this issue to our team to see whether we can improve.

[mp911de]

Thanks a lot. I was able to reproduce the issue.