java.lang.NullPointerException: Cannot get property 'length' on null object

Product Forums Katalon Studio
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1

Hello, when I try to execute this customer keyword:
@Keyword

public boolean isFileDownloaded(String downloadPath, String fileName) {

File dir = new File(downloadPath);

File[] dirContents = dir.listFiles();

String lastAttempt = "";

if (dirContents.length > 0) {

	for (int i = 0; i < dirContents.length; i++) {

		if (dirContents[i].getName().equals(fileName)) {

			// File has been found, it can now be deleted:

			dirContents[i].delete();

			KeywordUtil.markPassed(fileName + ' exist in ' + downloadPath + ' and was deleted')

			return true;

		}

		lastAttempt = dirContents[i].getName().equals(fileName);
	}

	if (lastAttempt != fileName) {

		KeywordUtil.markFailed(fileName + 'does not exist in' + downloadPath)

		return false;
	}
}

return false;

}
And when I execute I go the title error: java.lang.NullPointerException: Cannot get property ‘length’ on null object and I don’t know how to handle this. Thank you in advanced!

2

hi,

your filelist is empty that’s why you getting npe for length
can you debug it and see are there any files in dirContents list?

3

I cannot debug because I need Katalon Enterprise.

4

hi,

anyway the list is empty, that’s npe

5

Can you explain me, I am newbi. Thank you in advanced!

6

hi,

File[] dirContents = dir.listFiles();

dir.listFiles will return empty list

1 Like
7

Ty, I found another explanation written by you in another topic. Thank you very much!

8

Hey, what was the solution? I am also getting the same issue.

10

The issue was that the OP was trying to get the length of a property, but the property did not have any content. Can we see what you are trying to do and then we may be able to assist you?