2 files changed, 11 insertions, 5 deletions
diff --git a/sonar-plugin-api/src/main/java/org/sonar/api/batch/fs/internal/DefaultInputDir.java b/sonar-plugin-api/src/main/java/org/sonar/api/batch/fs/internal/DefaultInputDir.java
index 5e1ebb651c2..c788f55ebd9 100644
--- a/sonar-plugin-api/src/main/java/org/sonar/api/batch/fs/internal/DefaultInputDir.java
+++ b/sonar-plugin-api/src/main/java/org/sonar/api/batch/fs/internal/DefaultInputDir.java
@@ -21,6 +21,7 @@ package org.sonar.api.batch.fs.internal;
 
 import java.io.File;
 import java.nio.file.Path;
+import org.apache.commons.lang.StringUtils;
 import org.sonar.api.batch.fs.InputDir;
 import org.sonar.api.utils.PathUtils;
 
@@ -67,7 +68,13 @@ public class DefaultInputDir extends DefaultInputComponent implements InputDir {
 
   @Override
   public String key() {
-    return new StringBuilder().append(moduleKey).append(":").append(relativePath).toString();
+    StringBuilder sb = new StringBuilder().append(moduleKey).append(":");
+    if (StringUtils.isEmpty(relativePath)) {
+      sb.append("/");
+    } else {
+      sb.append(relativePath);
+    }
+    return sb.toString();
   }
 
   /**
diff --git a/sonar-plugin-api/src/main/java/org/sonar/api/resources/Directory.java b/sonar-plugin-api/src/main/java/org/sonar/api/resources/Directory.java
index fe72745346e..21e810aec94 100644
--- a/sonar-plugin-api/src/main/java/org/sonar/api/resources/Directory.java
+++ b/sonar-plugin-api/src/main/java/org/sonar/api/resources/Directory.java
@@ -19,14 +19,13 @@
  */
 package org.sonar.api.resources;
 
+import javax.annotation.CheckForNull;
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.builder.ToStringBuilder;
 import org.sonar.api.batch.fs.FileSystem;
 import org.sonar.api.scan.filesystem.PathResolver;
 import org.sonar.api.utils.WildcardPattern;
 
-import javax.annotation.CheckForNull;
-
 /**
  * @since 1.10
  */
@@ -140,8 +139,8 @@ public class Directory extends Resource {
   public static Directory create(String relativePathFromBaseDir) {
     Directory d = new Directory();
     String normalizedPath = normalize(relativePathFromBaseDir);
-    d.setKey(normalizedPath);
-    d.setPath(normalizedPath);
+    d.setKey(normalizedPath == null ? SEPARATOR : normalizedPath);
+    d.setPath(normalizedPath == null ? "" : normalizedPath);
     return d;
   }