diff --git a/gradle.properties b/gradle.properties
index 451f23766..c6acea154 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
-version = 3.2-SNAPSHOT
+version = 3.3-SNAPSHOT
 org.gradle.caching = true
 org.gradle.parallel = true
diff --git a/module/communication/controller/src/main/java/org/openbase/jul/communication/controller/AbstractControllerServer.java b/module/communication/controller/src/main/java/org/openbase/jul/communication/controller/AbstractControllerServer.java
index 45218eb4c..0148cd2fa 100644
--- a/module/communication/controller/src/main/java/org/openbase/jul/communication/controller/AbstractControllerServer.java
+++ b/module/communication/controller/src/main/java/org/openbase/jul/communication/controller/AbstractControllerServer.java
@@ -922,7 +922,7 @@ protected final Object getDataField(String name) throws NotAvailableException {
             }
             return dataClone.getField(findFieldByName);
         } catch (Exception ex) {
-            throw new NotAvailableException(name, this, ex);
+            throw new NotAvailableException(this.getClass(), name, ex);
         }
     }
 
diff --git a/module/exception/src/main/java/org/openbase/jul/exception/NotAvailableException.java b/module/exception/src/main/java/org/openbase/jul/exception/NotAvailableException.java
index e668ce8c9..3b037509c 100644
--- a/module/exception/src/main/java/org/openbase/jul/exception/NotAvailableException.java
+++ b/module/exception/src/main/java/org/openbase/jul/exception/NotAvailableException.java
@@ -46,155 +46,136 @@ public NotAvailableException(final Class identifier) {
         this(ContextType.CLASS, identifier.getSimpleName());
     }
 
-    /**
-     * Method generates a suitable exception message with the given {@code identifier}.
-     *
-     * @param identifier an instance providing a toString() method to identify the missing context.
-     */
-    public NotAvailableException(final Object identifier) {
-        this(identifier.toString());
-    }
-
     /**
      * Method generates a suitable exception message out of the given {@code context} and {@code identifier}.
      *
      * @param context    a keyword which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      */
-    public NotAvailableException(final String context, final Object identifier) {
-        this(context, identifier.toString());
+    public NotAvailableException(final String context, final Class identifier) {
+        this(context, identifier.getSimpleName());
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a keyword which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final String context, final Object identifier, final Throwable cause) {
-        this(context, identifier.toString(), cause);
+    public NotAvailableException(final String context, final Class identifier, final Throwable cause) {
+        this(context, identifier.getSimpleName(), cause);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context} and {@code identifier}.
      *
-     * @param context    a enum which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param context    an enum which describes the type of what is missing.
+     * @param identifier a class used as identifier of the missing context.
      */
-    public NotAvailableException(final ContextType context, final Object identifier) {
-        this(context, identifier.toString());
+    public NotAvailableException(final ContextType context, final Class identifier) {
+        this(context, identifier.getSimpleName());
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param context    an enum which describes the type of what is missing.
+     * @param identifier a class used as identifier of the missing context.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final ContextType context, final Object identifier, final Throwable cause) {
-        this(context, identifier.toString(), cause);
+    public NotAvailableException(final ContextType context, final Class identifier, final Throwable cause) {
+        this(context, identifier.getSimpleName(), cause);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context} and {@code identifier}.
      *
      * @param context    a keyword which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      */
-    public NotAvailableException(final Class context, final Object identifier) {
-        this(context.getSimpleName(), identifier.toString());
+    public NotAvailableException(final Class context, final Class identifier) {
+        this(context.getSimpleName(), identifier.getSimpleName());
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a class to describe the missing context.
-     * @param identifier an identifier to describe the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final Class context, final Object identifier, final Throwable cause) {
-        this(context.getSimpleName(), identifier.toString(), cause);
-    }
-
-    /**
-     * Method generates a suitable exception message out of the given {@code identifier} and {@code message}.
-     *
-     * @param identifier an instance providing a toString() method to identify the missing context.
-     * @param message    an additional message which is added to the end of the generated message.
-     */
-    public NotAvailableException(final Object identifier, final String message) {
-        this((String) null, identifier.toString(), message);
+    public NotAvailableException(final Class context, final Class identifier, final Throwable cause) {
+        this(context.getSimpleName(), identifier.getSimpleName(), cause);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a keyword which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      */
-    public NotAvailableException(final String context, final Object identifier, final String message) {
-        this(context, identifier.toString(), message);
+    public NotAvailableException(final String context, final Class identifier, final String message) {
+        this(context, identifier.getSimpleName(), message);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a keyword which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final String context, final Object identifier, final String message, final Throwable cause) {
-        this(context, identifier.toString(), message, cause);
+    public NotAvailableException(final String context, final Class identifier, final String message, final Throwable cause) {
+        this(context, identifier.getSimpleName(), message, cause);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param context    an enum which describes the type of what is missing.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      */
-    public NotAvailableException(final ContextType context, final Object identifier, final String message) {
-        this(context, identifier.toString(), message);
+    public NotAvailableException(final ContextType context, final Class identifier, final String message) {
+        this(context, identifier.getSimpleName(), message);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param context    an enum which describes the type of what is missing.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final ContextType context, final Object identifier, final String message, final Throwable cause) {
-        this(context, identifier.toString(), message, cause);
+    public NotAvailableException(final ContextType context, final Class identifier, final String message, final Throwable cause) {
+        this(context, identifier.getSimpleName(), message, cause);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a class to describe the missing context.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      */
-    public NotAvailableException(final Class context, final Object identifier, final String message) {
-        this(context.getSimpleName(), identifier.toString(), message);
+    public NotAvailableException(final Class context, final Class identifier, final String message) {
+        this(context.getSimpleName(), identifier.getSimpleName(), message);
     }
 
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
      * @param context    a class to describe the missing context.
-     * @param identifier an instance providing a toString() method to identify the missing context.
+     * @param identifier a class used as identifier of the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      * @param cause      the cause of this exception.
      */
-    public NotAvailableException(final Class context, final Object identifier, final String message, final Throwable cause) {
-        this(context.getSimpleName(), identifier.toString(), message, cause);
+    public NotAvailableException(final Class context, final Class identifier, final String message, final Throwable cause) {
+        this(context.getSimpleName(), identifier.getSimpleName(), message, cause);
     }
 
     /**
@@ -207,6 +188,17 @@ public NotAvailableException(final Class context, final String identifier) {
         this(context.getSimpleName(), identifier);
     }
 
+    /**
+     * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
+     *
+     * @param context    an object used to describe the missing context.
+     * @param identifier an identifier to identify the missing context.
+     * @param cause      the cause of this exception.
+     */
+    public NotAvailableException(final Object context, final String identifier, final Throwable cause) {
+        this(context.getClass(), identifier, cause);
+    }
+
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
@@ -244,7 +236,7 @@ public NotAvailableException(final Class context, final String identifier, final
     /**
      * Method generates a suitable exception message out of the given {@code context} and {@code identifier}.
      *
-     * @param context    a enum which describes the type of what is missing.
+     * @param context    an enum which describes the type of what is missing.
      * @param identifier an identifier to describe the missing context.
      */
     public NotAvailableException(final ContextType context, final String identifier) {
@@ -254,7 +246,7 @@ public NotAvailableException(final ContextType context, final String identifier)
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
+     * @param context    an enum which describes the type of what is missing.
      * @param identifier an identifier to describe the missing context.
      * @param cause      the cause of this exception.
      */
@@ -265,7 +257,7 @@ public NotAvailableException(final ContextType context, final String identifier,
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
+     * @param context    an enum which describes the type of what is missing.
      * @param identifier an identifier to describe the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      */
@@ -276,7 +268,7 @@ public NotAvailableException(final ContextType context, final String identifier,
     /**
      * Method generates a suitable exception message out of the given {@code context}, {@code identifier} and {@code message}.
      *
-     * @param context    a enum which describes the type of what is missing.
+     * @param context    an enum which describes the type of what is missing.
      * @param identifier an identifier to describe the missing context.
      * @param message    an additional message which is added to the end of the generated message.
      * @param cause      the cause of this exception.
diff --git a/module/extension/protobuf/src/main/java/org/openbase/jul/extension/protobuf/processing/ProtoBufFieldProcessor.java b/module/extension/protobuf/src/main/java/org/openbase/jul/extension/protobuf/processing/ProtoBufFieldProcessor.java
index d1f71a6aa..df357bae1 100644
--- a/module/extension/protobuf/src/main/java/org/openbase/jul/extension/protobuf/processing/ProtoBufFieldProcessor.java
+++ b/module/extension/protobuf/src/main/java/org/openbase/jul/extension/protobuf/processing/ProtoBufFieldProcessor.java
@@ -369,7 +369,7 @@ public static Object getMapEntry(final Object key, FieldDescriptor mapFieldDescr
             }
             throw new InvalidStateException("Key is unknown!");
         } catch (Exception ex) {
-            throw new NotAvailableException("Entry of Key", key, ex);
+            throw new NotAvailableException("Entry of Key", key.toString(), ex);
         }
     }
 
diff --git a/module/storage/src/main/java/org/openbase/jul/storage/file/FileSynchronizer.java b/module/storage/src/main/java/org/openbase/jul/storage/file/FileSynchronizer.java
index 64e86925b..5a578e452 100644
--- a/module/storage/src/main/java/org/openbase/jul/storage/file/FileSynchronizer.java
+++ b/module/storage/src/main/java/org/openbase/jul/storage/file/FileSynchronizer.java
@@ -120,7 +120,7 @@ public final File save(final D data) throws CouldNotPerformException {
             this.data = data;
 
             if (!file.exists()) {
-                throw new NotAvailableException(File.class, file, "File does not exist!");
+                throw new NotAvailableException(File.class, file.getAbsolutePath(), "File does not exist!");
             }
             
             if (!file.canWrite()) {