Java File IO + relative paths + NetBeans

Question

Quite simply:

File account = new File("./data/account");
account.createNewFile();

Gives me:

java.io.IOException: No such file or directory
  at java.io.UnixFileSystem.createFileExclusively(Native Method)
  at java.io.File.createNewFile(File.java:900)
  ...

Why Does file.createNewFile() give me a IOException with the message No such file or directory? I'm telling it to create the file.

Running this code outside of NetBeans seems to work with no problem, can NetBeans not handle relative file links?

Thanks in advance for any help!

. may refer to a different directory when running in Netbeans than the command line. — vegadoom
– vegadoom, Commented May 2, 2012 at 2:10
@Jeffrey . I feel a bit like an idiot now, no ./data does not exist. It did before I migrated the project into netbeans, that could explain it... Thanks! — Bill
– Bill, Commented May 2, 2012 at 2:12

Jeffrey · Accepted Answer · 2012-05-02 02:21:57Z

2

If ./data does not exist, that call will fail.

File f = new File("./data/account");
if(!f.getParentFile().exists()) { // if the directories don't exist
    if(!f.getParentFile().mkdirs()) { // if making the directories fails
        // directories weren't created, throw exception or something
    }
}
f.createNewFile();

edited May 2, 2012 at 2:21

answered May 2, 2012 at 2:15

Jeffrey

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1 Comment

Bill Over a year ago

Cool. Thanks. Appreciate it. Will this have any undesirable affects if the current path does already exist though?

poy · Accepted Answer · 2012-05-02 02:11:07Z

1

Netbeans is running the java program from the dist folder. You would need to create the data folder in there. However, I believe in some cases, Netbeans will clean out the entire folder and therefore delete it. I would use an absolute path.

answered May 2, 2012 at 2:11

poy

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2 Comments

Bill Over a year ago

Let's say to avoid this issue I want to create account if it doesn't already exist, and also create ./data too.

poy Over a year ago

That would be the safest route.

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