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Files.createFile method throwing NoSuchFileException

 
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this code runs perfectly

then why

this code giving NoSuchFileException at //line1
as per the get(String first, String... more), i have just created an instance of Path. why that instance is not valid in this createFile method which takes path instance as argument?
 
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Does the parent directory exist where you are trying to create the file?
 
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Puspender Tanwar wrote:
why

this code giving NoSuchFileException at //line1
as per the get(String first, String... more), i have just created an instance of Path. why that instance is not valid in this createFile method which takes path instance as argument?



Why because you haven't specified a file name. Take a look at your above code correctly.
 
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Partheban Udayakumar wrote:Why because you haven't specified a file name. Take a look at your above code correctly.


that's a mistake made by me here only. But according to you if the wrong statement is this, then would give compilation error not an exception
correcting that code..


ankit garg wrote: Does the parent directory exist where you are trying to create the file?


c:/myprograms/io/saveio2 upto this the directory exist .
 
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If c:/myprograms/io/saveio2/A exists it will not give you an exception and the program will create a file named B at that location. Also you should use the additional parameters as:
Paths.get("c:/myprograms/io/saveio2","A", "B");
This won't change the output of the program, but I guess from the API point of view this way is better as the API adds path separators...
 
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Ankit Garg wrote:If c:/myprograms/io/saveio2/A exists it will not give you an exception and the program will create a file named B at that location.


it works.. thank you
but ankit, why is it so ?
 
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Puspender Tanwar wrote:correcting that code..



Still this is not correct,

As Ankit said, /A and /B wont considered as files. That is the reason you are getting an exception. If you want to create a file named B, you should give as ankit has given. To create a file, the last name should be the file's name like a.txt or if you want to create a folder, use Paths.createFolder() method.
 
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Partheban Udayakumar wrote:To create a file, the last name should be the file's name like a.txt and if you want to create a folder, use Paths.createFolder() method.


that's incorrect, no need to write extensions (.txt, .jpg), if you don't write a extension then also a file is created

i don't thing Paths class is having any such static method createFolder(). neither File or Files are having such method. yes Files.createDirectory() is there for such operation

 
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Partheban Udayakumar wrote:

Puspender Tanwar wrote:



Still this is not correct,

As Ankit said, /A and /B wont considered as files. That is the reason you are getting an exception. If you want to create a file named B, you should give as ankit has given. To create a file, the last name should be the file's name like a.txt or if you want to create a folder, use Paths.createFolder() method.


Well I tried that and even with /A and /B it works as long as the path till /A exists.

The reason is as you said Partheban, the createFile method is supposed to create a file, not the parent directory. The exception is a bit misleading, instead of NoSuchFileException it should throw some "NoSuchParentDirectoryException" , or at least the message should be correct, the exception says:

NoSuchFileException: c:/myprograms/io/saveio2/A/B
But it should say:
NoSuchFileException: c:/myprograms/io/saveio2/A

So that you know that the problem is with the parent folder not existing...
 
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Puspender Tanwar wrote:i don't thing Paths class is having any such static method createFolder(). neither File or Files are having such method. yes Files.createDirectory() is there for such operation


Pardon me for that. It is createDirectory. I was in a hurry, so I typed createFolder.

Ankit Garg wrote:The reason is as you said Partheban, the createFile method is supposed to create a file, not the parent directory. The exception is a bit misleading, instead of NoSuchFileException it should throw some "NoSuchParentDirectoryException"


I agree with you. It can be no such directory exception but you forgot that Java runs on a machine, which unlike human, doesn't have reasoning capacity. So for it, if the developers have fed c:/myprograms/io/saveio2/A/B as file, it is a file. So it would throw only a NoSuchFileException. Since you are a human, you should have checked the full path.
 
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Partheban Udayakumar wrote:

Ankit Garg wrote:The reason is as you said Partheban, the createFile method is supposed to create a file, not the parent directory. The exception is a bit misleading, instead of NoSuchFileException it should throw some "NoSuchParentDirectoryException"


I agree with you. It can be no such directory exception but you forgot that Java runs on a machine, which unlike human, doesn't have reasoning capacity. So for it, if the developers have fed c:/myprograms/io/saveio2/A/B as file, it is a file. So it would throw only a NoSuchFileException. Since you are a human, you should have checked the full path.


The reason I say it should throw some better exception is because a method called "createFile" throwing "NoSuchFileException" is confusing. The method name suggests it will create a file and the exception says there is no such file. So the developer might say "I know there is no such file, that's why I've called this method, create the file for me"
 
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Ankit Garg wrote:The reason I say it should throw some better exception is because a method called "createFile" throwing "NoSuchFileException" is confusing. The method name suggests it will create a file and the exception says there is no such file. So the developer might say "I know there is no such file, that's why I've called this method, create the file for me"


I totally agree with you
 
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