Grails 4: model type [four.Foo] is not of the correct type [four.Foo]

[erichelgeson]

Using Grails 4 master (jdk 11.0.1) with views 2.0.0.BUILD-SNAPSHOT I am seeing issues where the model doesnt think it's correct though it is. I've re-created the sample here: https://github.com/erichelgeson/grails4/compare/eric/gsonIssue

2019-01-14 16:22:24.807 ERROR --- [nio-8080-exec-1] o.g.web.errors.GrailsExceptionResolver   : IllegalArgumentException occurred when processing request: [GET] /foo/index.json
Model variable [foo] of with value [four.Foo : (unsaved)] type [four.Foo] is not of the correct type [four.Foo]. Stacktrace follows:

java.lang.reflect.InvocationTargetException: null
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.grails.core.DefaultGrailsControllerClass$ReflectionInvoker.invoke(DefaultGrailsControllerClass.java:211)
	at org.grails.core.DefaultGrailsControllerClass.invoke(DefaultGrailsControllerClass.java:188)
	at org.grails.web.mapping.mvc.UrlMappingsInfoHandlerAdapter.handle(UrlMappingsInfoHandlerAdapter.groovy:90)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
	at org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:77)
	at org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalArgumentException: Model variable [foo] of with value [four.Foo : (unsaved)] type [four.Foo] is not of the correct type [four.Foo]
	at grails.views.WritableScriptTemplate.make(WritableScriptTemplate.groovy:138)
	at grails.plugin.json.view.template.JsonViewTemplate.make(JsonViewTemplate.groovy:19)
	at grails.views.mvc.GenericGroovyTemplateView.renderMergedOutputModel(GenericGroovyTemplateView.groovy:67)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
	at grails.views.mvc.renderer.DefaultViewRenderer.render(DefaultViewRenderer.groovy:117)
	at grails.artefact.controller.RestResponder$Trait$Helper.internalRespond(RestResponder.groovy:192)
	at grails.artefact.controller.RestResponder$Trait$Helper.respond(RestResponder.groovy:76)
	at four.FooController.index(FooController.groovy:8)
	... 15 common frames omitted

[graemerocher]

Looks like GSON views is not using the right classloader

[jameskleeh]

Fixed by 58a477f