ADDITIONAL SYSTEM INFORMATION :
Fedora 33 Linux 5.13.9-100.fc33.x86_64
openjdk version "16.0.2" 2021-07-20


A DESCRIPTION OF THE PROBLEM :
Given an absolute URI: 'http://example.com' (note no trailing '/')
and a relative path: 'test'
intuitively one would expect resolving to result in 'http://example.com/test'
This is how Python behaves, for example.

However, doing so in Java leads to a surprising result: 'http://example.comtest'
Seemingly the relative path ends up in the authority!
Under the hood, it turns out that 'test' is correctly set as the path, but there is never a '/' character introduced to separate the authority from the path.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The attached test case shows the issue.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
http://example.com/test
ACTUAL -
http://example.comtest

---------- BEGIN SOURCE ----------
import java.net.URI;

class UriResolve {
    public static void main(String[] args) {
        var base = URI.create("http://example.com");
        var rel = URI.create("test");
        System.out.format("base a: %s p: %s u: %s%n", base.getAuthority(), base.getPath(), base);
        System.out.format("rel a: %s p: %s u: %s%n", rel.getAuthority(), rel.getPath(), rel);
        var res = base.resolve(rel);
        System.out.format("res a: %s p: %s u: %s%n", res.getAuthority(), res.getPath(), res);
    }
}

---------- END SOURCE ----------

FREQUENCY : always