Plugin created with 3.1.6+ fails in an 3.1.1 app

[hbogaards]

Steps to Reproduce

1. Create and build a plugin using Grails 3.1.6
2. Create an application using Grails 3.1.1
3. Add the plugin as a dependency to the application
4. Start the application

Expected Behaviour

The application should start normally with the added behaviour of the plugin

Actual Behaviour

Startup fails with this Exception:

2016-04-29 13:45:42,229|WARN |main                |figEmbeddedWebApplicationContext| Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'grailsApplicationPostProcessor' defined in nl.anwb.hv.iom.Application: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [grails.boot.config.GrailsApplicationPostProcessor]: Factory method 'grailsApplicationPostProcessor' threw exception; nested exception is grails.plugins.exceptions.PluginException: Failed to initialize class [quercus.php.Application] from plugin [quercusPhp] : grails/boot/GrailsPluginApplication
2016-04-29 13:45:42,241|ERROR|main                |o.s.boot.SpringApplication      | Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'grailsApplicationPostProcessor' defined in nl.anwb.hv.iom.Application: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [grails.boot.config.GrailsApplicationPostProcessor]: Factory method 'grailsApplicationPostProcessor' threw exception; nested exception is grails.plugins.exceptions.PluginException: Failed to initialize class [quercus.php.Application] from plugin [quercusPhp] : grails/boot/GrailsPluginApplication
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:120)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:678)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:55)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:347)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:336)
    at grails.boot.GrailsApp$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
    at nl.anwb.hv.iom.Application.main(Application.groovy:18)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [grails.boot.config.GrailsApplicationPostProcessor]: Factory method 'grailsApplicationPostProcessor' threw exception; nested exception is grails.plugins.exceptions.PluginException: Failed to initialize class [quercus.php.Application] from plugin [quercusPhp] : grails/boot/GrailsPluginApplication
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
    ... 23 common frames omitted
Caused by: grails.plugins.exceptions.PluginException: Failed to initialize class [quercus.php.Application] from plugin [quercusPhp] : grails/boot/GrailsPluginApplication
    at org.grails.plugins.BinaryGrailsPlugin.initializeProvidedArtefacts(BinaryGrailsPlugin.java:156)
    at org.grails.plugins.BinaryGrailsPlugin.<init>(BinaryGrailsPlugin.java:90)
    at grails.plugins.DefaultGrailsPluginManager.createBinaryGrailsPlugin(DefaultGrailsPluginManager.java:391)
    at grails.plugins.DefaultGrailsPluginManager.findCorePlugins(DefaultGrailsPluginManager.java:378)
    at grails.plugins.DefaultGrailsPluginManager.attemptLoadPlugins(DefaultGrailsPluginManager.java:330)
    at grails.plugins.DefaultGrailsPluginManager.loadPlugins(DefaultGrailsPluginManager.java:240)
    at grails.boot.config.GrailsApplicationPostProcessor.initializeGrailsApplication(GrailsApplicationPostProcessor.groovy:87)
    at grails.boot.config.GrailsApplicationPostProcessor.setApplicationContext(GrailsApplicationPostProcessor.groovy:209)
    at grails.boot.config.GrailsApplicationPostProcessor.<init>(GrailsApplicationPostProcessor.groovy:76)
    at grails.boot.config.GrailsAutoConfiguration.grailsApplicationPostProcessor(GrailsAutoConfiguration.groovy:62)
    at nl.anwb.hv.iom.Application.grailsApplicationPostProcessor(Application.groovy)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1426)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
    ... 24 common frames omitted
Caused by: java.lang.NoClassDefFoundError: grails/boot/GrailsPluginApplication
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
    at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:677)
    at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:787)
    at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:775)
    at org.grails.plugins.BinaryGrailsPlugin.initializeProvidedArtefacts(BinaryGrailsPlugin.java:154)
    ... 40 common frames omitted
Caused by: java.lang.ClassNotFoundException: grails.boot.GrailsPluginApplication
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 56 common frames omitted

The part of the stacktrace I think is important:
Caused by: java.lang.NoClassDefFoundError: grails/boot/GrailsPluginApplication

This class is new in Grails 3.1.6.
But according to Graeme (in Slack) the Application class of the plugin shouldn't have been instantiated.

Environment Information

• Operating System: Windows 7 (64bit)
• Grails Version: 3.1.1 and 3.1.6
• JDK Version: Oracle JDK 8u92

Example Application

I will try to reproduce it with a new plugin and a new application.
What might be significant is that the plugin adds a Servlet in the doWithSpring in the GrailsPlugin class