javac: no source files

I tried to fix my problem with stack pages where the same problem but anything helps me.

Firstly, I changed the path :

cd C:\PROJECTS FOR FOXMINDED\TASK 12 - Service Layer\src\main\java\com\foxminded\university\cli

In the package cli I have my CheckSum.java

Then I tried to

javac -classpath "C:\PROJECTS FOR FOXMINDED\TASK 12 - Service 
Layer\src\main\java\com\foxminded\university\cli\CheckSum.java"

but I gain this :

javac: file not found: c:\home\files*.java
Usage: javac <options> <source files>
use -help for a list of possible options

In my System variables I have :

Path : D:\Java\jdk1.8.0_202\bin

CLASSPATH : D:\Java\jdk1.8.0_202\lib

I checked if my file java exists in this package with command dir and I saw it here.

I will be appreciate for your help!

Thanks in advance.

When I am running javac CheckSum.java in necessary path, I receive :

CheckSum.java:3: error: package picocli does not exist
import picocli.CommandLine;

CheckSum.java:4: error: package picocli.CommandLine does not exist
import picocli.CommandLine.Command;

CheckSum.java:5: error: package picocli.CommandLine does not exist
import picocli.CommandLine.Option;

CheckSum.java:6: error: package picocli.CommandLine does not exist
import picocli.CommandLine.Parameters;

CheckSum.java:14: error: cannot find symbol
@Command(name = "checksum", mixinStandardHelpOptions = true, version = "checksum 4.0",

 symbol: class Command
CheckSum.java:18: error: cannot find symbol
@Parameters(index = "0", description = "The file whose checksum to calculate.")

symbol:   class Parameters
  location: class CheckSum
CheckSum.java:21: error: cannot find symbol
@Option(names = {"-a", "--algorithm"}, description = "MD5, SHA-1, SHA-256, ...")

symbol:   class Option
location: class CheckSum
CheckSum.java:27: error: cannot find symbol
int exitCode = new CommandLine(new CheckSum()).execute(args);

  symbol:   class CommandLine
location: class CheckSum
8 errors

And the class CheckSum.java :

@Command(name = "checksum", mixinStandardHelpOptions = true, version = "checksum 4.0",description = "Prints the checksum (MD5 by default) of a file to STDOUT.")
class CheckSum implements Callable<Integer> {

@Parameters(index = "0", description = "The file whose checksum to calculate.")
private File file;

@Option(names = {"-a", "--algorithm"}, description = "MD5, SHA-1, SHA-256, ...")
private String algorithm = "MD5";

  public static void main(String[]args) {
    int exitCode = new CommandLine(new CheckSum()).execute(args);
    System.exit(exitCode);
}

  @Override
public Integer call() throws Exception { // your business logic goes here...
    byte[] fileContents = Files.readAllBytes(file.toPath());
    byte[] digest = MessageDigest.getInstance(algorithm).digest(fileContents);
    System.out.printf("%0" + (digest.length*2) + "x%n", new BigInteger(1, digest));
    return 0;
}

}

The format for running javac on Windows is as follows:

javac -cp path1;path2;path3 *.java

where:

path1 is the path to a directory or a jar file (not a java file or a class file), with libraries and such you use. For basic hello world, you would be using no such libraries, thus you don't need the classpath at all.

path2 is similar; It's up there to show you that you have to use colons to separate them (semicolons on windows).

*.java is the source file(s) you want to compile.

Your command sets up a java file as the classpath (this does nothing), and then specifies 0 files for actual compilation, thus producing the error you observe.

The fix: to compile your CheckSum file when you've already cd-ed into that folder, all you need is:

javac CheckSum.java

no need for a classpath.