Throw an IllegalStateException when retrieving the resolutionCacheRoot on the DefaultResolutionCacheManager if the basedir (or IvySettings) is not set (IVY-1482)

doc/release-notes.html

@@ -68,6 +68,7 @@ List of changes since Ivy 2.4.0:
 - FIX: Dependencies failed using branch attribute (and extra attributes) (IVY-1141) (Thanks to Stephen Haberman)
 - FIX: useCacheOnly should allow lookup of changing dependencies in cache (IVY-1515) (Thanks to Ilya)
 
+- IMPROVEMENT: Throw an IllegalStateException when retrieving the resolutionCacheRoot on the DefaultResolutionCacheManager if the basedir (or IvySettings) is not set (IVY-1482)
 - IMPROVEMENT: Optimization: limit the revision numbers scanned if revision prefix is specified (Thanks to Ernestas Vaiciukevičius)
 - IMPROVEMENT: Update bouncycastle to 1.52 (IVY-1521) (Thanks to Michal Srb)
 

src/java/org/apache/ivy/core/cache/DefaultResolutionCacheManager.java

@@ -74,6 +74,12 @@ public class DefaultResolutionCacheManager implements ResolutionCacheManager, Iv
     }
 
     public File getResolutionCacheRoot() {
+        if (basedir == null) {
+            if (settings == null) {
+                throw new IllegalStateException("The 'basedir' or 'IvySettings' has not been set on the ResolutionCacheManager");
+            }
+            basedir = settings.getDefaultResolutionCacheBasedir();
+        }
         return basedir;
     }
 
@@ -213,7 +219,7 @@ public class DefaultResolutionCacheManager implements ResolutionCacheManager, Iv
     }
 
     public void clean() {
-        FileUtil.forceDelete(getBasedir());
+        FileUtil.forceDelete(getResolutionCacheRoot());
     }
 
     private static class CacheParserSettings implements ParserSettings {