diff --git a/scm-core/src/main/java/sonia/scm/repository/api/BlameCommandBuilder.java b/scm-core/src/main/java/sonia/scm/repository/api/BlameCommandBuilder.java
index fe22dc933a..0d0b5158e1 100644
--- a/scm-core/src/main/java/sonia/scm/repository/api/BlameCommandBuilder.java
+++ b/scm-core/src/main/java/sonia/scm/repository/api/BlameCommandBuilder.java
@@ -258,6 +258,11 @@ public final class BlameCommandBuilder
   static class CacheKey implements RepositoryCacheKey, Serializable
   {
 
+    /** Field description */
+    private static final long serialVersionUID = 8373766042131887789L;
+
+    //~--- constructors -------------------------------------------------------
+
     /**
      * Constructs ...
      *
diff --git a/scm-core/src/main/java/sonia/scm/repository/api/BrowseCommandBuilder.java b/scm-core/src/main/java/sonia/scm/repository/api/BrowseCommandBuilder.java
index 33cf1786ec..e3eb0a0be9 100644
--- a/scm-core/src/main/java/sonia/scm/repository/api/BrowseCommandBuilder.java
+++ b/scm-core/src/main/java/sonia/scm/repository/api/BrowseCommandBuilder.java
@@ -276,6 +276,11 @@ public final class BrowseCommandBuilder
   static class CacheKey implements RepositoryCacheKey, Serializable
   {
 
+    /** Field description */
+    private static final long serialVersionUID = 8078650026812373524L;
+
+    //~--- constructors -------------------------------------------------------
+
     /**
      * Constructs ...
      *
diff --git a/scm-core/src/main/java/sonia/scm/repository/api/DiffCommandBuilder.java b/scm-core/src/main/java/sonia/scm/repository/api/DiffCommandBuilder.java
index 072a56b927..dfe874813e 100644
--- a/scm-core/src/main/java/sonia/scm/repository/api/DiffCommandBuilder.java
+++ b/scm-core/src/main/java/sonia/scm/repository/api/DiffCommandBuilder.java
@@ -65,8 +65,8 @@ import java.io.OutputStream;
  * String content = diff.setRevision("33b93c443867").getContent();
  * System.out.println(content);
  * </code></pre>
- * 
- * 
+ *
+ *
  * TODO check current behavior.
  *
  * @author Sebastian Sdorra
diff --git a/scm-core/src/main/java/sonia/scm/repository/api/LogCommandBuilder.java b/scm-core/src/main/java/sonia/scm/repository/api/LogCommandBuilder.java
index 6d0cb60021..e39c3ced14 100644
--- a/scm-core/src/main/java/sonia/scm/repository/api/LogCommandBuilder.java
+++ b/scm-core/src/main/java/sonia/scm/repository/api/LogCommandBuilder.java
@@ -402,6 +402,11 @@ public final class LogCommandBuilder
   static class CacheKey implements RepositoryCacheKey, Serializable
   {
 
+    /** Field description */
+    private static final long serialVersionUID = 5701675009949268863L;
+
+    //~--- constructors -------------------------------------------------------
+
     /**
      * Constructs ...
      *