scalac gives spurious type mismatch errors when calling java with source

[scabug]

In Java, I have:

// java/p/UseIt.java
package p;

import q.Z;

public class UseIt {
    public static Z getZ() {
        return new Z();
    }
    
    public static q.Z zFullyQualified() {
        return getZ();
    }
}

// java/p/Z.java
package p;
public class Z {}

// java/q/Z.java}
package q;
public class Z {}

In Scala:

// scala/SomeClass.scala
class SomeClass {
  val z: q.Z = p.UseIt.zFullyQualified
  val z2: q.Z = p.UseIt.getZ //error here
}

When compiling, there is an error:

src/scala/SomeClass.scala:3: error: type mismatch;
 found   : p.Z
 required: q.Z
  val z2: q.Z = p.UseIt.getZ //error here
                        ^
one error found

This works when the return type in Java is fully qualified.

I think what's causing this is a difference in precedence/shadowing between Scala and Java. In Java, although UseIt is in package p and has access to p.Z, the import q.Z shadows it:
JLS 6.4.1:
{quote}A single-type-import declaration d in a compilation unit c of package p that imports a type named n shadows, throughout c, the declarations of:

• any top level type named n declared in another compilation unit of p{quote}

In the SLS chapter 2, assuming a "compilation unit" includes all classes in a package regardless of which file they are in, the class p.Z has a higher precedence than the import q.Z. I assume that when the Scala compiler reads in Java and does the Scala conversion, it ends up mistakenly using the scoping rules from Scala instead of Java.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-7380?orig=1
Reporter: Donny Nadolny (dnadolny)
Affected Versions: 2.9.2, 2.10.1
Duplicates #7232

[scabug]

@retronym said:
I'm pretty sure this is a duplicate of #7232, I'll just confirm that.

[scabug]

@retronym said (edited on Apr 17, 2013 9:01:10 PM UTC):
Yep, same bug. Your project compiles with 2.10.2-SNAPSHOT. 2.10.2-RC1 is scheduled for for mid-May.

~/Downloads/ScalaJavaMix sbt -sbt-create -scala-version 2.10.1 compile
Detected sbt version 0.12.1
Using /Users/jason/.sbt/0.12.1 as sbt dir, -sbt-dir to override.
[info] Loading global plugins from /Users/jason/.sbt/0.12.1/plugins
[info] Set current project to default-c9f4e7 (in build file:/Users/jason/Downloads/ScalaJavaMix/)
[info] Defining *:scala-version
[info] The new value will be used by no settings or tasks.
[info] Reapplying settings...
[info] Set current project to default-c9f4e7 (in build file:/Users/jason/Downloads/ScalaJavaMix/)
[info] Updating {file:/Users/jason/Downloads/ScalaJavaMix/}default-c9f4e7...
[info] Resolving org.scala-lang#scala-library;2.10.1 ...
[info] Done updating.
[info] Compiling 1 Scala source and 4 Java sources to /Users/jason/Downloads/ScalaJavaMix/target/scala-2.10/classes...
[error] /Users/jason/Downloads/ScalaJavaMix/src/main/scala/my/test/bl/handler/BusinessHandler.scala:6: value getAssignedUsr is not a member of my.test.bl.bo.Drawer
[error]         System.out.println(drw.getAssignedUsr())
[error]                                ^
[error] one error found
[error] (compile:compile) Compilation failed
[error] Total time: 2 s, completed Apr 17, 2013 10:58:49 PM

~/Downloads/ScalaJavaMix sbt -sbt-create -scala-home /code/scala2/build/pack compile
Detected sbt version 0.12.1
Using /Users/jason/.sbt/0.12.1 as sbt dir, -sbt-dir to override.
[info] Loading global plugins from /Users/jason/.sbt/0.12.1/plugins
[info] Set current project to default-c9f4e7 (in build file:/Users/jason/Downloads/ScalaJavaMix/)
[info] Defining {.}/*:scala-home
[info] The new value will be used by no settings or tasks.
[info] Reapplying settings...
[info] Set current project to default-c9f4e7 (in build file:/Users/jason/Downloads/ScalaJavaMix/)
[success] Total time: 0 s, completed Apr 17, 2013 10:59:04 PM