ExtractFile Failed with NullPointExcetion

[LonelyTangzz]

Recently, I was doing a dependency upgrade of an old project, and planned to upgrade the original Zip4j@1.3.2 to 2.7.0, but when I did the unit test of the decompression part after the upgrade, I couldn't get the fileAttributeView normally, resulting in a null pointer exception.

    private static void applyWindowsFileAttributes(Path file, byte[] fileAttributes) {
        if (fileAttributes[0] != 0) {
            DosFileAttributeView fileAttributeView = (DosFileAttributeView)Files.getFileAttributeView(file, DosFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);//here can't get fileAttributeView

            try {
                fileAttributeView.setReadOnly(BitUtils.isBitSet(fileAttributes[0], 0));
                fileAttributeView.setHidden(BitUtils.isBitSet(fileAttributes[0], 1));
                fileAttributeView.setSystem(BitUtils.isBitSet(fileAttributes[0], 2));
                fileAttributeView.setArchive(BitUtils.isBitSet(fileAttributes[0], 5));
            } catch (IOException var4) {
            }

        }
    }

I did breakpoint debugging, this path of file is non-empty, which is strange, and the folder access permission is also granted. Does the author know what happened?

[srikanth-lingala]

Do you have a stacktrace for me?

[LonelyTangzz]

here

Caused by: net.lingala.zip4j.exception.ZipException: java.lang.NullPointerException
	at net.lingala.zip4j.tasks.AsyncZipTask.performTaskWithErrorHandling(AsyncZipTask.java:58)
	at net.lingala.zip4j.tasks.AsyncZipTask.execute(AsyncZipTask.java:45)
	at net.lingala.zip4j.ZipFile.extractFile(ZipFile.java:672)
	at net.lingala.zip4j.ZipFile.extractFile(ZipFile.java:528)
	at net.lingala.zip4j.ZipFile.extractFile(ZipFile.java:484)
	at com.manulife.productengine.mut.util.RegFileUtil.unzipFile(RegFileUtil.java:86)
	... 65 more
Caused by: java.lang.NullPointerException
	at net.lingala.zip4j.util.FileUtils.applyWindowsFileAttributes(FileUtils.java:469)
	at net.lingala.zip4j.util.FileUtils.setFileAttributes(FileUtils.java:54)
	at net.lingala.zip4j.util.UnzipUtil.applyFileAttributes(UnzipUtil.java:47)
	at net.lingala.zip4j.tasks.AbstractExtractFileTask.extractFile(AbstractExtractFileTask.java:68)
	at net.lingala.zip4j.tasks.ExtractFileTask.executeTask(ExtractFileTask.java:47)
	at net.lingala.zip4j.tasks.ExtractFileTask.executeTask(ExtractFileTask.java:26)
	at net.lingala.zip4j.tasks.AsyncZipTask.performTaskWithErrorHandling(AsyncZipTask.java:51)
	... 70 more

When calling getFileAttributeView, the @NotNull that triggers this method causes the initialization of fileAttributeView to fail, resulting in NPE in setReadOnly in try. But I guarantee that the incoming file is non-empty, which is quite strange. By the way, When I used zip4j@1.3.2, this question didn't happen.

[LonelyTangzz]

[srikanth-lingala]

Fixed in v2.11.0 released today