[jira] [Created] (GROOVY-9517) CompileStatic typeCasting runtime error from Class Array to Class List

["David Estes (Jira)" <ji...@apache.org>]

David Estes created GROOVY-9517:
-----------------------------------

             Summary: CompileStatic typeCasting runtime error from Class Array to Class List
                 Key: GROOVY-9517
                 URL: https://issues.apache.org/jira/browse/GROOVY-9517
             Project: Groovy
          Issue Type: Bug
          Components: Static compilation
    Affects Versions: 3.0.3, 3.0.2, 2.4.19, 2.4.0
         Environment: Java: openjdk version "1.8.0_242"
OS: OS X Catalina 10.15.3
Groovy: 2.4.19
            Reporter: David Estes


After upgrading asset-pipeline-core from groovy 2.0.7 to 2.4.15 then 2.4.19 . A bug was identified with @CompileStatic not properly handling runtime type casting when sorting an Array instead of a List

 

Example

 

Create File TestFile.groovy
{code:java}
import groovy.transform.CompileStaticpublic class TestFile {	static void main(String[] args) {
		File file = new File('.')
		TestFile testFile = new TestFile()
		testFile.listSortedFiles(file)
	}
	@CompileStatic
	void listSortedFiles(File directory) {
		File[] files = directory.listFiles()
		files = files?.sort { File a, File b -> a.name.compareTo b.name } as File[]
		for(File file in files) {
		}
	}
	
		
}

{code}
Then simply run:
{code:java}
groovy TestFile.groovy
{code}
 

Exception:

 
{code:java}
Caught: java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.io.File;
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.io.File;
	at TestFile.listSortedFiles(TestFile.groovy:15)
	at TestFile$listSortedFiles.call(Unknown Source)
	at TestFile.main(TestFile.groovy:8)
{code}
 



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