Not able to load file from Maven resources with Paths.get()

Question

I apologize for this seemingly easy and almost a stupid question, but I have spent a lot of time to fix it without much success.

I created a very simple maven project and then a simple text file inside the src/resources folder like this.

pom.xml is simple. The App class looks like this:

public class App {
    public static void main(String[] args) throws IOException {
        Files.lines(Paths.get("test.txt")).forEach(System.out::println);
    }
}

And the exception that I get:

Exception in thread "main" java.nio.file.NoSuchFileException: test.txt
    at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79)
    at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
    at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
    at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230)
    at java.nio.file.Files.newByteChannel(Files.java:361)
    at java.nio.file.Files.newByteChannel(Files.java:407)
    at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384)
    at java.nio.file.Files.newInputStream(Files.java:152)
    at java.nio.file.Files.newBufferedReader(Files.java:2784)
    at java.nio.file.Files.lines(Files.java:3744)
    at java.nio.file.Files.lines(Files.java:3785)
    at com.rahul.App.main(App.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Process finished with exit code 1

This seems to be a very stupid problem but I just can't get my head around it. Any help is sincerely appreciated.

Use `Class.getResourceAsStream()`. https://stackoverflow.com/questions/3294196/load-resource-from-anywhere-in-classpath — Koenig, Mar 11 '18 at 16:32
I could...but whats wrong with this. It's supposed to be much more "simpler" with java 8. — RDM, Mar 11 '18 at 16:33

davidxxx · Accepted Answer · 2018-03-11T16:50:31.420

8

You are using Maven and the text file that you want to load is correctly placed to be in the classpath : src/main/resources. The problem is that Paths.get("test.txt") doesn't search the file in the classpath but in the filesystem.

So what you need is getting the resource from the classpath as a URI and to pass it to Paths.get(URI):

Path textFile = Paths.get(App.class.getResource("/test.txt").toURI());
Files.lines(textFile).forEach(System.out::println);

Note that the way to get the Path is really convoluted.
Unfortunately the Class class was not updated to take advantage of the java nio API that was introduced in Java 7.
It would be really simpler if we could write something like :

Files.lines(App.class.getResourcePath("/test.txt"))
     .forEach(System.out::println);

edited Mar 11 '18 at 16:50

answered Mar 11 '18 at 16:35

davidxxx

125,838
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where is getClass() defined ? – RDM Mar 11 '18 at 16:36
`The problem is that Paths.get("test.txt") doesn't search the file in the classpath but in the filesystem.` ==> wow...I had no clue about this. – RDM Mar 11 '18 at 16:37
`getClass()` is defined in the `Class` class. In your case, it is the `App` class. – davidxxx Mar 11 '18 at 16:38
You are welcome. I completely agree. It is really too much complex to make a so simple thing. I updated about. – davidxxx Mar 11 '18 at 16:47
Just try : App.class instead of getClass() if using in static method(inside main), getClass() is called on "this"/current object. – Bikas Katwal Mar 11 '18 at 16:48
@Bikas Katwal Right. The actual code uses static context. I updated to be conform to. Thanks for the note. – davidxxx Mar 11 '18 at 16:51
Thank you all for your time and all the help. – RDM Mar 11 '18 at 17:07

Ahmet · Answer 2 · 2019-01-03T13:24:28.540

0

Please check your test.txt path. You are trying to access your file like it is in the same folder with your Main class. You should be using the correct relative path if you want to access your file.

edited Jan 03 '19 at 13:24

answered Mar 11 '18 at 16:34

Ahmet

1,045
13
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Not able to load file from Maven resources with Paths.get()

2 Answers2