Replacing default FileSystemProvider

[Michael Hall]

> On Mar 25, 2021, at 9:25 PM, Michael Hall <mik3hall at gmail.com> wrote:
> 
> Caused by: java.lang.ClassCastException: class us.hall.trz.osx.MacPath cannot be cast to class sun.nio.fs.UnixPath (us.hall.trz.osx.MacPath is in unnamed module of loader 'app'; sun.nio.fs.UnixPath is in module java.base of loader 'bootstrap')
> 	at java.base/sun.nio.fs.UnixPath.compareTo(Unknown Source)

Maybe understand this a little bit.

My application REST API’s using Apache HttpClient are not working.

ava.lang.NoClassDefFoundError: Could not initialize class sun.security.ssl.SSLContextImpl$CustomizedTLSContext
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Unknown Source)
	at java.base/java.security.Provider$Service.getImplClass(Unknown Source)
	at java.base/java.security.Provider$Service.newInstance(Unknown Source)

Debugging messages show…
2021-03-27 22:34:16.849 HalfPipe[5244:239243] MacPath: unlimited
2021-03-27 22:34:16.849 HalfPipe[5244:239243] MacPath: /Users/mjh/HalfPipe/HalfPipe_jpkg/outputdir/HalfPipe.app/Contents/runtime/Contents/Home/conf/security/policy
2021-03-27 22:34:16.849 HalfPipe[5244:239243] MacPath: /Users/mjh/HalfPipe/HalfPipe_jpkg/outputdir/HalfPipe.app/Contents/runtime/Contents/Home/conf/security/policy
2021-03-27 22:34:16.850 HalfPipe[5244:239243] MacPath: /Users/mjh/HalfPipe/HalfPipe_jpkg/outputdir/HalfPipe.app/Contents/runtime/Contents/Home/conf/security/policy/unlimited
2021-03-27 22:34:16.850 HalfPipe[5244:239243] MacPath: /Users/mjh/HalfPipe/HalfPipe_jpkg/outputdir/HalfPipe.app/Contents/runtime/Contents/Home/conf/security/policy/unlimited
2021-03-27 22:34:16.854 HalfPipe[5244:239243] java.lang.Exception: UnixPath

…that I am trying to access security files in the runtime conf directory just before the error.
This is very similar to this StackOverflow I found…

Apache HttpClient failing with Java 11 on macOS
https://stackoverflow.com/questions/61185934/apache-httpclient-failing-with-java-11-on-macos <https://stackoverflow.com/questions/61185934/apache-httpclient-failing-with-java-11-on-macos>

Getting a nearly identical error when these files couldn’t be found.
They are there for me but I think with my FileSystemProvider I instead get the ClassCastException from the Unix provider. I don’t get enough of the stack trace to know why I end up with a Unix provider. Maybe I could come up with a simple test case where I’d get the full error.

UnixPath for the source I have does…
@Override
    public int compareTo(Path other) {
        int len1 = path.length;
        int len2 = ((UnixPath) other).path.length;

        int n = Math.min(len1, len2);
        byte v1[] = path;
        byte v2[] = ((UnixPath) other).path;

Code that casts like this if it is reached will never work with an overridden DefaultFileSystemProvider instance. 



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