java.nio.file not workin in java 8

Question

I have the following code:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;
public class debugImageMain {
    public static void main() throws IOException {
        Path path = Paths.get("path/to/file");
        byte[] data = Files.readAllBytes(path);
    }
}

But when I run I get:

Exception in thread "main" java.lang.NoSuchMethodException: pdc.conversor.debugImageMain.main([Ljava.lang.String;) at java.lang.Class.getMethod(Class.java:1786)

javac -version gives: javac 1.8.0_60 and I have java VERSION 8 Update 91.

IntelliJ tell me java.nio.file imports are underlined in red and says "Usages of API which isn't available at the configured language level.

Any help please???

no it work your main method is not correct ;) it should be `public static void main(String[] args) throws IOException {` — Youcef LAIDANI, Jun 03 '17 at 20:07
And in "Project structure", you probably selected Java 6 (or lower) as your language level, instead of Java 8, hence the warning. — JB Nizet, Jun 03 '17 at 21:18
The stack trace shows clearly that `java.nio.file` has exactly nothing to do with it. — user207421, Jun 04 '17 at 00:04
*"java.nio.file not workin in java 8"* ... Java is 20 years old. Its libraries have been continuously developed for many years. It requires a peculiar form of arrogance to conclude that an error in a program you have written must reside in the Java libraries ... rather than in the code you have written. — scottb, Jun 04 '17 at 00:31
@scottb very hepfull.... I didn't write "java.nio.file not workin in java 8 because Java is wrong" you just concluded I thought it was java fault... I wrote it that way because all over the internet it says java.nio.file doesn't work in java 6 or lower... so to avoid people to tell me that my java version was old... because it was java 8 then the problem couldn't be java... — J Agustin Barrachina, Jun 04 '17 at 18:02

score 1 · Answer 1 · answered Jun 03 '17 at 21:41

1

Java required the main method to be definded correctly which is the entry point to run the app.

Try:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;
public class debugImageMain {
    public static void main(String[] args) throws IOException {
        Path path = Paths.get("path/to/file");
        byte[] data = Files.readAllBytes(path);
    }
}

answered Jun 03 '17 at 21:41

Minh Kieu

475
3
9

Btw, Java naming convention is to have Class name starts in Capital. – Minh Kieu Jun 03 '17 at 21:42
you are right... my bad... thanks for the advise about the convention. – J Agustin Barrachina Jun 04 '17 at 22:26

score 1 · Accepted Answer · answered Jun 03 '17 at 23:30

1

The problem is not with java.nio.file, the problem is in the definition of main signature.

The only way to running a program in Java is with the specific public static void main (String [] args) signature.

To fix your current statement, change this:

public static void main() throws IOException {

For this:

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

Check it out these entries first, and second

answered Jun 03 '17 at 23:30

JUAN CALVOPINA M

3,695
2
21
37

It worked... as IntelliJ underlined in red the java.nio.file it led me to believe the problem was there... But it was a complicatedly different issue. Thank you very much. – J Agustin Barrachina Jun 04 '17 at 22:27

java.nio.file not workin in java 8

2 Answers2