Hypermedia-related auto-configuration doesn't back off in the absence of Jackson

[wilkinsona]

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'halObjectMapperConfigurer' defined in class path resource [org/springframework/boot/autoconfigure/hateoas/HypermediaAutoConfiguration$HypermediaConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:235) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:702) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:527) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[classes/:na]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:736) [classes/:na]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369) [classes/:na]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:313) [classes/:na]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1161) [classes/:na]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1150) [classes/:na]
	at sample.hypermedia.SampleHypermediaApplication.main(SampleHypermediaApplication.java:26) [classes/:na]
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
	at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_102]
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_102]
	at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_102]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:489) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:206) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:187) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(InitDestroyAnnotationBeanPostProcessor.java:125) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:295) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:947) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
	... 15 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_102]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_102]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_102]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_102]
	... 26 common frames omitted

[wilkinsona]

HttpMessageConverters has a similar problem. It assumes that if org.springframework.hateoas.mvc.TypeConstrainedMappingJackson2HttpMessageConverter is on the class path then Jackson must be too.