Files created on 1970-01-01 0000.0 are never copied when the target is not present.

[AndreasKl]

This issue occurred to me when copying javascript from a node module.

These files were created on 1970-01-01 : 0000.00 and were not copied by the maven-resources-plugin. I was able to track the issue down to the:

public static void copyFile( File from, File to, String encoding, FilterWrapper[] wrappers, boolean overwrite ) public static void copyFile( File from, File to, String encoding, FilterWrapper[] wrappers, boolean overwrite ) throws IOException

method.

The behaviour can be emulated with touch -t 197001010000.00 test-1970-01-01.txt.

The root cause is https://docs.oracle.com/javase/7/docs/api/java/io/File.html#lastModified()

...or 0L if the file does not exist or if an I/O error occurs...

In this case the lastModified of the source file is equal to the lastModified of the non existing target file.

[michael-o]

WTF, stupid return values. So one does never know wether it is really 0L or bogus 0L.

[AndreasKl]

@michael-o I was really surprised that this behaviour exists since Java 1.0. I could have called file exists in the fix but was unsure about the performance impact e.g. if the source is on a remote system with high latency.

[AndreasKl]

@michael-o @khmarbaise is there anything I can do to get this PR merged?

[michael-o]

Thanks for the ping, I completely forgot that. Will merge this week.