Netbeans: Try to load file but not found (Java)

Question

I have every time the same problem when I'm trying to load files with Java in Netbeans (6.9). It seems that the files aren't found. I get the error:

java.lang.NullPointerException

In this context:

File file = new File(this.getClass().getClassLoader().getResource("file.xml").getFile());
// or this also don't work
File file = new File("file.xml");

The file file.xml is in the same directory as the Main.java file. How could I load this file?

Answer 1

This should work (it does for me):

String path = URLDecoder.decode(getClass().getResource("file.xml").getFile(), "UTF-8");
File f = new File(path);

If I understand the Javadocs correctly, this should be the same as using getClass().getClassloader().getResource() but in my experience it is different

Answer 2

I would suggest that you add a line so it says something along the lines (untested):

File f = new File(....);
System.out.println("f=" + f.getAbsolutePath());
// do stuff with f

This will tell you exactly where the file is expected to be and allow you to figure out what exactly is going on.

Answer 3

有时您可能需要在前面添加一个额外的/

File file = new File(this.getClass().getClassLoader().getResource("/file.xml").getFile());