Update `Path` creation for nested locations to allow both UNC and classic
file references to be used. This commit attempts to align our URL
handling with that of standard file URLs. The `NestedLocation` class
no longer attempts to remove leading all `\` characters and instead
only removes the first `\` when the second char is `:`. This duplicates
the logic found in Java's own internal `WindowsUriSupport` class which
is used when calling `Path.of(url)` with a `file:` URL.
Fixes gh-40549
Refine the fix for gh-38611 so that `ClosedByInterruptException` no
longer retries in a loop.
Our previous fix was flawed due to the fact that another interrupt
could occur after we clear the first and whilst we are reading data.
If this happens 10 times in a row, we raise an exception and end up
causing NoClassDefFoundError errors.
Our new approach retains the use of `FileChannel` and a direct buffer
up to the point that a `ClosedByInterruptException` is raised or the
thread is detected as interrupted. At that point, we temporarily
switch to using a `RandomAccessFile` to access the data. This will
block the thread until the data has been read.
Fixes gh-40096
Rename the internal `FileChannelDataBlock` to `FileDataBlock` since we
want to fallback to a `RandomAccessFile` when a thread is interrupted.
See gh-40096
Update `NestedJarFile` so that the `getManifest()` method returns the
manifest from the parent jar file for nested jars based on directory
entries.
This restores the previous behavior supported by Spring Boot 3.1 and
allows class methods such as `getPackage().getImplementationVersion()`
to return non `null` results.
Fixes gh-38996
Update `ZipContent` so that `META-INF` entries are no longer duplicated
in nested jars created from directory entries. This aligns with the
behavior of the classic loader and prevents the same META-INF file from
being discovered twice.
Fixes gh-38862
Update `JarFileArchive` so that unpacked jars use `file:` URLs rather
than `jar:file:`. This aligns with the behavior of Spring Boot 3.1 and
allows calls to `class.getSigners()` to work again.
Fixes gh-38833
