java.nio.file.InvalidPathException: Illegal char <:> at index 2:

Question

I have to copy classpath resource from one package to another.

My program is:

    public static void main(String[] args) throws IOException, URISyntaxException {

            ClassLoader classLoader = CopyFileToDirectoryTest.class.getClassLoader();
InputStream in = classLoader.getResourceAsStream("com/stackoverflow/main/Movie.class");

            URI uri = ClassLoader.getSystemResource("com/stackoverflow/json").toURI();
            Path path = Paths.get(uri.getPath(),"Movie.class");
            System.out.println(path);

            long copy = Files.copy(in, path, StandardCopyOption.REPLACE_EXISTING);
            System.out.println(copy);

        }

At Files.copy method I get exception:

Exception in thread "main" java.nio.file.InvalidPathException: Illegal char <:> at index 2: /D:/Programs/workspaceEE/HibernateDemo/target/classes/com/stackoverflow/json
    at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
    at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
    at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
    at java.nio.file.Paths.get(Paths.java:84)
    at com.stackoverflow.main.CopyFileToDirectoryTest.main(CopyFileToDirectoryTest.java:34)

How to solve it?

Solution

public static void main(String[] args) throws IOException, URISyntaxException {
        ClassLoader classLoader = CopyFileToDirectoryTest.class.getClassLoader();
        InputStream in = classLoader.getResourceAsStream("com//stackoverflow//main//Movie.class");
        URI uri = ClassLoader.getSystemResource("com//stackoverflow//json").toURI();
        String mainPath = Paths.get(uri).toString();
        Path path = Paths.get(mainPath, "Movie.class");
        System.out.println(path);
        long copy = Files.copy(in, path, StandardCopyOption.REPLACE_EXISTING);
        System.out.println(copy);
    }

This code correctly copies Movie.class from package com/stackoverflow/main into com/stackoverflow/json.

This doesn't work because your classpath is composed of transparent and **opaque** resources - such as those inside a `jar`. You are trying to write to a path that looks something like `jar:file:/com/stackoverflow/json`, which is an invalid `Path` or `File` but a valid URI. In general, you cannot write to the classpath, only read from it. — Boris the Spider, May 15 '17 at 06:47
When you compile a Maven project it will generate a jar. How else would you distribute your compiled code? (Pre Java 9 that is) — Boris the Spider, May 15 '17 at 06:50
Does this answer your question? [Java NIO file path issue](https://stackoverflow.com/questions/9834776/java-nio-file-path-issue) — Pino, Nov 14 '19 at 11:00

score 52 · Accepted Answer · answered May 15 '17 at 07:42

problem is that Paths.get() doesnt expect that kind of value which is generated from uri.getPath().

Solution:

URI uri = ClassLoader.getSystemResource("com/stackoverflow/json").toURI();
String mainPath = Paths.get(uri).toString();
Path path = Paths.get(mainPath ,"Movie.class");

score 8 · Answer 2 · edited Jan 03 '21 at 12:50

8

Try this:

Path path = new File(getClass()
.getResource("/<path to the image in your build/classes folder>")
.getFile()).toPath();

to get the correct path. Worked for me after several hours trying to find out why I couldn't get the file from the jar. This works for NetBeans 8.02

edited Jan 03 '21 at 12:50

lczapski

3,838
3
13
30

answered Jun 06 '19 at 12:53

Fego

85
1
5

score 5 · Answer 3 · edited Jan 10 '19 at 12:32

5

I had the same issue and got the exception, noticed there was a space in the filename, so I had to trim it. After that, the issue is resolved.

Path filePath = Paths.get(dirPathStr, newFileName.trim());

edited Jan 10 '19 at 12:32

svarog

9,019
4
61
71

answered Dec 28 '17 at 21:09

techguy

61
1
2

score 1 · Answer 4 · edited Nov 14 '19 at 05:32

1

I have the same problem which I was facing from the past two days and finally, I got it Space causes such problem try to solve

var fileName=YourFileName.trim();
Path filePath = Paths.get(dirPathStr, fileName);

edited Nov 14 '19 at 05:32

tryingToLearn

9,007
10
70
99

answered May 11 '19 at 14:06

SUDIP SINGH

21
2

score 0 · Answer 5 · edited Jan 03 '21 at 09:35

0

The following solutions work correctly:

Solution1:

String logFileLocalPath = "../log/log.txt";
File logFile = new File(getURL(logFileLocalPath).getPath());

Solution 2:

File logFile = new 
File(Paths.get(getURL(logFileLocalPath).toURI()).toString());

private static URL getURL(String localPath) {

      return Main.class.getResource(localPath);
}

edited Jan 03 '21 at 09:35

Osadhi Virochana

1,297
2
10
19

answered Jan 03 '21 at 09:11

Programmer

47
7

score 0 · Answer 6 · answered Jan 13 '22 at 12:09

I faced same issue while using extentReports in my automation, i simply corrected the report path

public void config() {
    String path = System.getProperty("user.dir")+"\\reports\\index.html";       
    ExtentSparkReporter reporter = new ExtentSparkReporter(path);
    reporter.config().setReportName("Web Automation Reports");
    reporter.config().setDocumentTitle("Web Results");

... }

score 0 · Answer 7 · answered Mar 31 '22 at 21:48

0

After trying many times, this worked for me

      Path path = new File(getClass().getResource("/data.json").getFile()).toPath();

Now you can use your path as you wish e.g

        Reader reader = Files.newBufferedReader(path);

answered Mar 31 '22 at 21:48

Odwori

762
7
13

java.nio.file.InvalidPathException: Illegal char <:> at index 2:

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