Copy file in Java and replace existing target

You need to pass Path arguments as explained by the error message:

Path from = cfgFilePath.toPath(); //convert from File to PathPath to = Paths.get(strTarget); //convert from String to PathFiles.copy(from, to, StandardCopyOption.REPLACE_EXISTING);

That assumes your strTarget is a valid path.

As a complement to @assylias' answer:

If you use Java 7, drop File entirely. What you want is Path instead.

And to get a Path object matching a path on your filesystem, you do:

Paths.get("path/to/file"); // argument may also be absolute

Get used to it real fast. Note that if you still use APIs which require File, Path has a .toFile() method.

Note that if you are in the unfortunate case where you use an API which returns File objects, you can always do:

theFileObject.toPath()

But in code of yours, use Path. Systematically. Without a second thought.

EDIT Copying a file to another using 1.6 using NIO can be done as such; note that the Closer class is inspited by Guava:

public final class Closer    implements Closeable{    private final List<Closeable> closeables = new ArrayList<Closeable>();    // @Nullable is a JSR 305 annotation    public <T extends Closeable> T add(@Nullable final T closeable)    {        closeables.add(closeable);        return closeable;    }    public void closeQuietly()    {        try {            close();        } catch (IOException ignored) {        }    }    @Override    public void close()        throws IOException    {        IOException toThrow = null;        final List<Closeable> l = new ArrayList<Closeable>(closeables);        Collections.reverse(l);        for (final Closeable closeable: l) {            if (closeable == null)                continue;            try {                closeable.close();            } catch (IOException e) {                if (toThrow == null)                    toThrow = e;            }        }        if (toThrow != null)            throw toThrow;    }}// Copy one file to another using NIOpublic static void doCopy(final File source, final File destination)    throws IOException{    final Closer closer = new Closer();    final RandomAccessFile src, dst;    final FileChannel in, out;    try {        src = closer.add(new RandomAccessFile(source.getCanonicalFile(), "r");        dst = closer.add(new RandomAccessFile(destination.getCanonicalFile(), "rw");        in = closer.add(src.getChannel());        out = closer.add(dst.getChannel());        in.transferTo(0L, in.size(), out);        out.force(false);    } finally {        closer.close();    }}

package main.java;import java.io.IOException;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;import java.nio.file.StandardCopyOption;public class CopyFileOnExist {    public static void main(String[] args)  {        Path sourceDirectory = Paths.get("C:/Users/abc/Downloads/FileNotFoundExceptionExample/append.txt");        Path targetDirectory = Paths.get("C:/Users/abc/Downloads/FileNotFoundExceptionExample/append5.txt");        //copy source to target using Files Class        try {            Files.copy(sourceDirectory, targetDirectory,StandardCopyOption.REPLACE_EXISTING);        } catch (IOException e) {            System.out.println(e.toString());        }    }}