the way access nested scala singleton from java code changes in JDK11

[docete]

reproduction steps

I have the following scala code (in scala 2.11.12)

package pkg1

object outer {
    object inner {
        def foo() = ???
    }
}

And the following java code to call function foo

package pkg2;

import pkg1.outer;

public class Test {
    public void bar() {
        outer.inner$.MODULE$.foo();
    }
}

for JDK8, it works. But for JDK11, the compiler complain "cannot find symbol inner$"

problem

I checked the class files and found the decompiled codes are exactly the same.

[lrytz]

I couldn't reproduce this. Can you show step by step what you did, which versions?

$> cat Test.scala
package pkg1

object outer {
    object inner {
        def foo() = println("hi")
    }
}
$> cat Test.java
package pkg2;

import pkg1.outer;

public class Test {
  public static void main(String[] args) {
        outer.inner$.MODULE$.foo();
  }
}
$> scalac -2.11.12 Test.scala -d .
$> java -version
openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.6+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.6+10, mixed mode)
$> javac -cp .:$(cs fetch -p org.scala-lang:scala-library:2.11.12) -d . Test.java
$> java -cp .:$(cs fetch -p org.scala-lang:scala-library:2.11.12) pkg2.Test
hi
$>

[docete]

@lrytz Seems the simplified cases couldn't reproduce this. I will close this and find another case. Thank you!

[lqhuang]

@docete Hey, did you still meet similar problems. I run into a very similar one. Let me try to make a minimal reproducible case.

[som-snytt]

@lqhuang #9714 was fixed in 2.13.13

That is for "mixed compilation", not "separate compilation".

[som-snytt]

The fix has a test. I verified that it also works for nested object, or from Java

        public static p.Module.Target$ target() {
                return p.Module.Target$.MODULE$;
        }

I don't recall the details, so I guessed at where to write $.

I will close this as duplicate, but please update if there is more info.