Incompatibility with later version of jdk (>= 13) in SourceFinder.java:361

[Bluesbreaker45]

A method with signature newFileSystem(Path path, Map<String,?> env) was introduced in version 13, which results in the conflict in SourceFinder.java:361.
According to FileSystems.java in version 8 (which is recommended to compile this project), newFileSystem(Path path, ClassLoader loader) should be used in this context.
So an explicit cast should be used here.

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