java.io.FileNotFoundException (Access is denied) - file.canWrite() does not working

Question

I'm trying to empty a jasper file. Before write, I checked it for write access and I t gives me that I can write on it. But it terminates with java.io.FileNotFoundException (Access is denied) - file.canWrite() What am I missing?

        try {
                File f = new File("C:\\Program Files (x86)\\XXXXXX\\XXX\\X\\X.jrxml");
                if(f.canWrite()){
                    BufferedWriter bf = new BufferedWriter(new FileWriter(f));
                    bf.write("");
                    bf.close();
                }

    } catch (Exception e) {
        e.printStackTrace();
    }

Have you cross checked if some other process is still using that file? That can be a possible cause. — Aninda Bhattacharyya
– Aninda Bhattacharyya, Commented Feb 10, 2015 at 15:44

HavelTheGreat · Accepted Answer · 2015-02-10 15:46:26Z

1

Writing in your Program Files folder often has quite restricted access, and you must be on an Administrator account to do so usually. I would suggest you try saving your .jrxml in a more accessible directory outside \\Program Files (x86) like your ApplicationData folder, it may even already be there.

You can also try something like Isolated Storage to ensure you have permissions, this should show you how to use it.

answered Feb 10, 2015 at 15:46

HavelTheGreat

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archz · Accepted Answer · 2015-02-10 16:15:04Z

1

Apparently, canWrite may return true even if you cannot write on windows (according to this : http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8060110). The javadoc is not really clear about that.

You can try using Files.isWritable if you are using at least java 7 to see if you have the expected result. Otherwise, it seems that the only way to check the rights is to try writing and see what happens.

answered Feb 10, 2015 at 16:15

archz

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