Replacing default FileSystemProvider

[Brian Burkhalter]

This is the correct forum.

I would have to investigate this to give you an answer. Certainly Alan will have something to write but as he is in Europe I doubt it will be today.

If this thread is not resolved before then, I will look into this on Monday.

> On Mar 19, 2021, at 1:11 PM, Michael Hall <mik3hall at gmail.com> wrote:
> 
> This may not be the correct forum to ask about this. If I should try posting to StackOverflow or elsewhere that’s fine if you indicate that.
> 
> I wrote a Mac specific FileSystemProvider sometime back that replaced the default, prior to Java 9 modular.I get exceptions shortened to ones that follow at the end.  I shortened that to as simple a test case as possible.
> 
> public class Test {
> 	
> 	public static void main(String [] args) {
> 		System.out.println(FileSystems.getDefault());
> 	}
> 	
> }
> 
> class TestProvider extends FileSystemProvider {
>    private final FileSystemProvider priorProvider;
>    private static final String scheme = "file”;
> 
> …
> 
> }
> 
> Which gets the same exceptions. I’ve noticed there were similar issues with getDefault() returning null about the time of Java 9 modular.
> Are any of these issues still open? Is there anything different that should be done now? Is there any documentation I should look at?
> 
> The exceptions…
> 
> java -cp test.jar -Djava.nio.file.spi.DefaultFileSystemProvider=org.test.TestProvider -d . Test.java
> Exception in thread "main" java.lang.Error: java.lang.NullPointerException: Cannot invoke "java.nio.file.FileSystem.getPath(String, String[])" because the return value of "java.nio.file.FileSystems.getDefault()" is null
> 	at java.base/java.nio.file.FileSystems$DefaultFileSystemHolder.getDefaultProvider(FileSystems.java:133)
> 	at java.base/java.nio.file.FileSystems$DefaultFileSystemHolder$1.run(FileSystems.java:102)
> 	at java.base/java.nio.file.FileSystems$DefaultFileSystemHolder$1.run(FileSystems.java:100)
> 
> Both the old code and the simpler test case seem to get these in pairs.
> 
> Caused by: java.lang.NullPointerException: Cannot invoke "java.nio.file.FileSystem.getPath(String, String[])" because the return value of "java.nio.file.FileSystems.getDefault()" is null
> 	at java.base/java.io.File.toPath(File.java:2316)

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