[jira] [Closed] (GROOVY-7376) ClassCastException when searching for a property inside a with closure

["Pascal Schumacher (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-7376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pascal Schumacher closed GROOVY-7376.
-------------------------------------
    Resolution: Duplicate

> ClassCastException when searching for a property inside a with closure
> ----------------------------------------------------------------------
>
>                 Key: GROOVY-7376
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7376
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.3.11
>            Reporter: Mauro Molinari
>
> I know this is not ideal, but I couldn't isolate this in a small test case.
> However, my real case is something like this:
> {code}
> package test
> import groovy.transform.CompileStatic;
> @CompileStatic
> class Test {
> 	String testProperty
> 	
> 	void doSomething(Foo f) {
> 		f.with {
> 			propertyA = testProperty
> 			bar(testProperty)
> 		}
> 	}
> 	
>  
> 	static void main(String[] args) {
> 		def t = new Test()
> 		def f = new Foo()
> 		t.testProperty = 'test'
> 		t.doSomething(f)
> 		println f.propertyA
> 	}
> }
> @CompileStatic
> class Foo {
> 	String propertyA
> 	void bar(String param) {
> 		println("bar $param")
> 	}
> 	
> 	static class Nested {
> 		String propertyB
> 	}	
> }
> {code}
> It happens that the row with {{t.testProperty = 'test'}} or the one with {{bar(testProperty)}} (it depends on how I change the code in ways that in theory *should* be equivalent with each other) throw a {{ClassCastException}} with the following stack trace:
> {noformat}
> (when calling bar(...))
> ClassCastException.<init>(String) line: 58	
> GeneratedMethodAccessor1279.invoke(Object, Object[]) line: not available	
> Method.invoke(Object, Object...) line: 606	
> CachedMethod.invoke(Object, Object[]) line: 90	
> MetaClassImpl.invokeMissingProperty(Object, String, Object, boolean) line: 873	
> MetaClassImpl.getProperty(Class, Object, String, boolean, boolean) line: 1852	
> MetaClassImpl.getProperty(Object, String) line: 3689	
> InvoiceIdto.getProperty(String) line: not available	
> InvokerHelper.getProperty(Object, String) line: 168	
> Test$_doSomething_closure2(Closure).getPropertyTryThese(String, Object, Object) line: 321	
> {noformat}
> Or:
> {noformat}
> (when trying to set propertyA value)
> ClassCastException.<init>(String) line: 58	
> GeneratedMethodAccessor1287.invoke(Object, Object[]) line: not available	
> Method.invoke(Object, Object...) line: 606	
> CachedMethod.invoke(Object, Object[]) line: 90	
> CachedMethod(MetaMethod).doMethodInvoke(Object, Object[]) line: 324	
> MetaClassImpl.setProperty(Class, Object, String, Object, boolean, boolean) line: 2661	
> MetaClassImpl.setProperty(Object, String, Object) line: 3701	
> InvoiceIdto.setProperty(String, Object) line: not available	
> InvokerHelper.setProperty(Object, String, Object) line: 191	
> InvoiceListService$_refreshInvoice_closure2(Closure).setPropertyTryThese(String, Object, Object, Object) line: 388	
> {noformat}
> The {{ClassCastException}} message is that {{Foo$Nested}} cannot be cast to {{Foo}}. In fact, in the following row of the stack trace:
> {noformat}
> MetaClassImpl.setProperty(Object, String, Object) line: 3701	
> {noformat}
> I see the following values for variables:
> - {{object}} is my {{Foo}} instance
> - {{property}} is either {{'propertyA'}} or {{'testProperty'}} (depends on cases)
> - but {{this}} is an instance of {{MetaClassImpl}} for {{Foo$Nested}} rather than for {{Foo}} (the toString() is something like {{groovy.lang.MetaClassImpl@6c720cf6[class test.Foo$Nested]}}).
> I hope this can give you an idea on what may be going on.
> Removing the static compilation with {{@TypeChecked(TypeCheckingMode.SKIP)}} on the equivalent of {{Test.doSomething}} does not solve the problem, neither it does if I remove the {{@CompileStatic}} from the {{Foo}} class declaration.



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