Build manager failure with Java source

[scabug]

With the following Java source,

public interface I {
  public class C implements I {}
}

the refined build manager fails with the following stacktrace,

java.lang.Error: no-symbol does not have owner
at scala.tools.nsc.symtab.Symbols$$NoSymbol$$.owner(Symbols.scala:1985)
at scala.tools.nsc.symtab.Symbols$$Symbol.cloneSymbol(Symbols.scala:1042)
at scala.tools.nsc.interactive.RefinedBuildManager$$$$anonfun$$updateDefinitions$$2$$$$anonfun$$apply$$21.apply(RefinedBuildManager.scala:331)
at scala.tools.nsc.interactive.RefinedBuildManager$$$$anonfun$$updateDefinitions$$2$$$$anonfun$$apply$$21.apply(RefinedBuildManager.scala:328)
at scala.collection.TraversableLike$$$$anonfun$$map$$1.apply(TraversableLike.scala:238)
at scala.collection.TraversableLike$$$$anonfun$$map$$1.apply(TraversableLike.scala:238)
at scala.collection.LinearSeqLike$$class.foreach(LinearSeqLike.scala:97)
at scala.collection.immutable.List.foreach(List.scala:46)
at scala.collection.TraversableLike$$class.map(TraversableLike.scala:238)
at scala.collection.immutable.List.map(List.scala:46)
at scala.tools.nsc.interactive.RefinedBuildManager$$$$anonfun$$updateDefinitions$$2.apply(RefinedBuildManager.scala:328)
at scala.tools.nsc.interactive.RefinedBuildManager$$$$anonfun$$updateDefinitions$$2.apply(RefinedBuildManager.scala:327)
at scala.collection.Iterator$$class.foreach(Iterator.scala:582)
at scala.collection.IndexedSeqLike$$Elements.foreach(IndexedSeqLike.scala:47)
at scala.collection.IterableLike$$class.foreach(IterableLike.scala:83)
at scala.collection.immutable.HashSet.foreach(HashSet.scala:36)
at scala.tools.nsc.interactive.RefinedBuildManager.updateDefinitions(RefinedBuildManager.scala:327)
at scala.tools.nsc.interactive.RefinedBuildManager.update0$$1(RefinedBuildManager.scala:180)
at scala.tools.nsc.interactive.RefinedBuildManager.update(RefinedBuildManager.scala:185)
at scala.tools.nsc.interactive.RefinedBuildManager.update(RefinedBuildManager.scala:93)
at scala.tools.eclipse.EclipseBuildManager.build(EclipseBuildManager.scala:120)
at scala.tools.eclipse.ScalaProject.build(ScalaProject.scala:407)
at scala.tools.eclipse.ScalaBuilder.build(ScalaBuilder.scala:87)
at org.eclipse.core.internal.events.BuildManager$$2.run(BuildManager.java:627)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:218)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:360)
at org.eclipse.core.internal.resources.Project$$1.run(Project.java:522)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1782)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:502)
at org.eclipse.core.internal.resources.Project.build(Project.java:94)
at org.eclipse.ui.actions.BuildAction.invokeOperation(BuildAction.java:221)
at org.eclipse.ui.actions.WorkspaceAction.execute(WorkspaceAction.java:162)
at org.eclipse.ui.actions.WorkspaceAction$$2.runInWorkspace(WorkspaceAction.java:483)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

in updateDefinitions. It seems that the dependency analyzer is reporting NoSymbol as the definition corresponding to C. Nb. if I is changed to a class with C extending it, then there is no error.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-3045?orig=1
Reporter: @milessabin

[scabug]

@hubertp said:
Consequence of r20776, this example must have slipped my tests.

[scabug]

@hubertp said:
(In r20858) Fixes #3045. No review.

[scabug]

@hubertp said:
I am guessing that the problem should actually be solved in a different way ( by enabling namers, typers phases for .java files?) but this quick fix is I believe a good temporary solution.