Re: Bug or change in behavoir ? Commons IO

Hm, we'll have to look into that one. In the meantime, I added 

org.apache.commons.io.FileUtilsListFilesTest.testListFilesMissing()

which asserts the current behavior in git master.

TY,
Gary

On 2024/12/30 17:00:17 Dave Garratt wrote:
> 
> I have recently tried updating from Commons IO 2.16.1 to Commons IO 2.18.0
> 
> My java program constantly polls a folder for the presence of files. Normally this will be a remote folder on a windows share.
> 
> In Commons IO 2.16.1 when I use FileUtils.listFiles it would trigger an exception if the folder being polled became unavailable and I would use this to trigger an action.
> 
> In Commons IO 2.18.0 the error does not occur.
> 
> I have created a very simple test program to illustrate this.
> 
> Running this code with Commons IO 2.16.1 and passing an invalid (non existent) path to it gives me the following exception (which in my case is desirable):
> 
> import java.io.File;
> 
> import org.apache.commons.io.FileUtils;
> 
> public class Test2161
> {
> 
> 	public static void main(String[] args)
> 	{
> 		File dir = new File("/Users/dave/Downloads/nonexistent");
> 		
> 		try
> 		{
> 			FileUtils.listFiles(dir, args, false);
> 		}
> 		catch (Exception ex)
> 		{
> 			System.out.println(ex.getMessage());
> 			ex.printStackTrace();
> 		}
> 	}
> }
> 
> java.nio.file.NoSuchFileException: /Users/dave/Downloads/nonexistent
> java.io.UncheckedIOException: java.nio.file.NoSuchFileException: /Users/dave/Downloads/nonexistent
> 	at org.apache.commons.io.function.Uncheck.wrap(Uncheck.java:339)
> 	at org.apache.commons.io.function.Uncheck.get(Uncheck.java:199)
> 	at org.apache.commons.io.FileUtils.listFiles(FileUtils.java:2313)
> 	at Test2161.main(Test2161.java:14)
> Caused by: java.nio.file.NoSuchFileException: /Users/dave/Downloads/nonexistent
> 	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
> 	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
> 	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
> 	at java.base/sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
> 	at java.base/sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:148)
> 	at java.base/java.nio.file.Files.readAttributes(Files.java:1851)
> 	at java.base/java.nio.file.FileTreeWalker.getAttributes(FileTreeWalker.java:226)
> 	at java.base/java.nio.file.FileTreeWalker.visit(FileTreeWalker.java:277)
> 	at java.base/java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:323)
> 	at java.base/java.nio.file.FileTreeIterator.<init>(FileTreeIterator.java:71)
> 	at java.base/java.nio.file.Files.walk(Files.java:3918)
> 	at org.apache.commons.io.file.PathUtils.walk(PathUtils.java:1847)
> 	at org.apache.commons.io.FileUtils.streamFiles(FileUtils.java:2952)
> 	at org.apache.commons.io.FileUtils.lambda$listFiles$10(FileUtils.java:2313)
> 	at org.apache.commons.io.function.Uncheck.get(Uncheck.java:197)
> 	... 2 more
> 
> 
> 
> If however I run the same code with Commons IO 2.18.0 I get nothing, no indication that the path is not valid which make it difficult to determine if the folder is empty or the remote file server is shutdown.
> 
> Am I supposed to use a different way to accomplish the same error condition now ?
> 
> Thanks
> 
> Dave
> 
> 
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