Bug in association of association

Question

Hi

 

First of all, I want to congratulate you. PlantUML is really great!

 

But I have the following situation, comes up to an Exception (using last version of PlantUML - 7985):

 

@startuml

class recording <<relator>>
class track <<kind>>
class performerArtist <<mixin>>

recording "1.. *" -- "1.. *" performerArtist : <<mediation>> m1
recording "1" -- "1" track : <<mediation>> m2

track "1.. *" -- "1.. *" performerArtist : <<material>> records
(track,performerArtist) *..  "1.. *" recording : BUG HERE

@enduml

 

The exception:

Exception net.sourceforge.plantuml.svek.EmptySvgException
net.sourceforge.plantuml.cucadiagram.UnparsableGraphvizException: net.sourceforge.plantuml.svek.EmptySvgException
at net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek2.createFile(Unknown Source)
at net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFileInternal(Unknown Source)
at net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFile(Unknown Source)
at net.sourceforge.plantuml.cucadiagram.CucaDiagram.exportDiagramInternal(Unknown Source)
at net.sourceforge.plantuml.UmlDiagram.exportDiagram(Unknown Source)
at net.sourceforge.plantuml.PSystemUtils.exportDiagramsCuca(Unknown Source)
at net.sourceforge.plantuml.PSystemUtils.exportDiagrams(Unknown Source)
at net.sourceforge.plantuml.SourceFileReader.getGeneratedImages(Unknown Source)
at net.sourceforge.plantuml.Run.manageFileInternal(Unknown Source)
at net.sourceforge.plantuml.Run.processArgs(Unknown Source)
at net.sourceforge.plantuml.Run.manageAllFiles(Unknown Source)
at net.sourceforge.plantuml.Run.main(Unknown Source)
Caused by: net.sourceforge.plantuml.svek.EmptySvgException
at net.sourceforge.plantuml.svek.DotStringFactory.solve(Unknown Source)
... 12 more

 

Everything becomes fine if I drop the blue lines:

@startuml

class recording <<relator>>
class track <<kind>>
class performerArtist <<mixin>>

track "1.. *" -- "1.. *" performerArtist : <<material>> records

(track,performerArtist) *..  "1.. *" recording : NO BUG ANYMORE

@enduml

 

or if I drop the bold text from the red line:

 

@startuml

class recording <<relator>>
class track <<kind>>
class performerArtist <<mixin>>

recording "1.. *" -- "1.. *" performerArtist : <<mediation>> m1
recording "1" -- "1" track : <<mediation>> m2
track "1.. *" -- "1.. *" performerArtist : <<material>> records

(track,performerArtist) *..  "1.. *" recording 

@enduml

But, in this last case, the result is strange (image link here: https://drive.google.com/file/d/0B-stUfZ8C6-rN2xoOEZnN2FLbmc).

Could you, please, check it out?

Thank you a lot!