Errata for OCPJP Java 8 Jeanne Boyarsky Chapter 9

[Mihaela Hetea]

On Windows, the method Paths.get(URI) doesn't throw a RuntimeException if the URI is not absolute.

 Path path = Paths.get("panda", "cudly");
        System.out.println(path);
        try {
            URI uri = new URI("file://pandas/cudly.png");
            Path file1 = Paths.get(uri);
            System.out.println("File "+file1.toAbsolutePath()+" exists: "+Files.exists(file1));
            System.out.println(file1.toUri());
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }

The output is:

panda\cudly
File \\pandas\cudly.png\ exists: false
file://pandas/cudly.png/

Also the examples with the http schema throw exception

java.nio.file.FileSystemNotFoundException: Provider "http" not installed

.
From the implementation of getPath(URI) it seems that the file:// schema is taken by default, whereas for the others the method

FileSystemProvider.installedProviders()

is called, which on my computer returns file and jar. Does this mean that in the context of Path class only URI with schema file can be used or other providers can be installed? (like http for example)

Thanks.

[Mihaela Hetea]

In question 20 of the review questions answer G is considered to be correct, but the Paths method is Paths.get and not Paths.getPath, so answer G should also be invalid.

[Jeanne Boyarsky]

Mihaela Hetea wrote:In question 20 of the review questions answer G is considered to be correct, but the Paths method is Paths.get and not Paths.getPath, so answer G should also be invalid.

I don't see a choice G in question 20 (page 503) or hasPath. I checked in my printed book, the e-book and the Sybex online materials.

Can you confirm the question number? And what format of book you are using?

For your other comment in this thread, I need either Scott to confirm or time to get my Windows VM working.

[Jeanne Boyarsky]

Jeanne Boyarsky wrote:

Mihaela Hetea wrote:In question 20 of the review questions answer G is considered to be correct, but the Paths method is Paths.get and not Paths.getPath, so answer G should also be invalid.

I don't see a choice G in question 20 (page 503) or hasPath. I checked in my printed book, the e-book and the Sybex online materials.

Can you confirm the question number? And what format of book you are using?

For your other comment in this thread, I need either Scott to confirm or time to get my Windows VM working.

Ah. It's question 12, not question 20! Got it.

[Mihaela Hetea]

Yes, it is question 12. Sorry, my mistake.

[Jeanne Boyarsky]

Mihaela Hetea wrote:On Windows, the method Paths.get(URI) doesn't throw a RuntimeException if the URI is not absolute.

Finally got to try it on Windows.

This throws an exception on both Windows and Mac:

URI uri = new URI("file://pandas.png");
Path file1 = Paths.get(uri);

This one throws an Exception on Mac, but not Windows:

URI uri = new URI("file://pandas/cudly.png");
Path file1 = Paths.get(uri);

I'll note this.

Mihaela Hetea wrote:Also the examples with the http schema throw exception

java.nio.file.FileSystemNotFoundException: Provider "http" not installed

.
From the implementation of getPath(URI) it seems that the file:// schema is taken by default, whereas for the others the method

FileSystemProvider.installedProviders()

is called, which on my computer returns file and jar. Does this mean that in the context of Path class only URI with schema file can be used or other providers can be installed? (like http for example)

It throws an exception on Mac too. Since http isn't on the exam, that was just meant to show it exists. Not work.