Absolute jar path

[BrendanC23]

I'm trying to use an absolute path to the jar file.

const java = new JavaCaller({
    jar: "F:\\my-path\\file.jar",
});

However, this gets turned into -jar ./F:\my-path\file.jar.

See this line:

https://github.com/nvuillam/node-java-caller/blob/main/lib/java-caller.js#L213

[BrendanC23]

This can be fixed by changing from ${this.rootPath}/${this.jar} to ${path.join(this.rootPath, this.jar)}. This will automatically handle absolute or relative paths.

[nvuillam]

@BrendanC23 agreed :)
Please can you make a the pull request ? :)