From caf4b1c62a695c2216226c505d24f4bd77652e1d Mon Sep 17 00:00:00 2001
From: Cedric Beust <cedric.beust@le.com>
Date: Wed, 8 Mar 2017 13:38:41 -0800
Subject: [PATCH] Fix StackOverFlow.

Fixes https://github.com/cbeust/kobalt/issues/339.
---
 .../beust/kobalt/maven/aether/KobaltMavenResolver.kt   | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/aether/KobaltMavenResolver.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/aether/KobaltMavenResolver.kt
index 69192c20..0320d456 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/aether/KobaltMavenResolver.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/maven/aether/KobaltMavenResolver.kt
@@ -45,7 +45,8 @@ class KobaltMavenResolver @Inject constructor(val settings: KobaltSettings,
     fun resolve(artifact: Artifact, scope: Scope? = null, filter: DependencyFilter? = null)
         = resolve(artifactToId(artifact), scope, filter)
 
-    fun resolveToIds(id: String, scope: Scope? = null, filter: DependencyFilter? = null) : List<String> {
+    fun resolveToIds(id: String, scope: Scope? = null, filter: DependencyFilter? = null,
+            seen: HashSet<String> = hashSetOf<String>()) : List<String> {
         val rr = resolve(id, scope, filter)
         val children =
             rr.root.children.filter {
@@ -55,7 +56,12 @@ class KobaltMavenResolver @Inject constructor(val settings: KobaltSettings,
             }
         val result = listOf(artifactToId(rr.root.artifact)) + children.flatMap {
                 val thisId = artifactToId(it.artifact)
-                resolveToIds(thisId, scope, filter)
+                if (! seen.contains(thisId)) {
+                    seen.add(thisId)
+                    resolveToIds(thisId, scope, filter, seen)
+                } else {
+                    emptyList()
+                }
             }
         return result
     }