diff --git a/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/DefaultEngineAddon.java b/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/DefaultEngineAddon.java
index fc570fbed..01091f182 100644
--- a/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/DefaultEngineAddon.java
+++ b/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/DefaultEngineAddon.java
@@ -10,63 +10,13 @@
  *******************************************************************************/
 package org.eclipse.gemoc.xdsmlframework.api.engine_addon;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-
-import org.eclipse.gemoc.xdsmlframework.api.core.EngineStatus.RunStatus;
-import org.eclipse.gemoc.xdsmlframework.api.core.IExecutionEngine;
-
-import org.eclipse.gemoc.trace.commons.model.trace.Step;
-
+@Deprecated()
+/**
+ * Engine addon with no behavior at all.
+ *
+ * @deprecated Use {@link IEngineAddon} directly instead, as all operations have
+ *             default empty implementations.
+ */
 public class DefaultEngineAddon implements IEngineAddon {
 
-	@Override
-	public void engineAboutToStart(IExecutionEngine engine) {
-	}
-
-	@Override
-	public void engineStarted(IExecutionEngine executionEngine) {
-	}
-
-	@Override
-	public void aboutToSelectStep(IExecutionEngine engine, Collection<Step<?>> steps) {
-	}
-
-	@Override
-	public void stepSelected(IExecutionEngine engine, Step<?> selectedStep) {
-	}
-
-	@Override
-	public void engineStopped(IExecutionEngine engine) {
-	}
-
-	@Override
-	public void aboutToExecuteStep(IExecutionEngine executionEngine, Step<?> stepToApply) {
-	}
-
-	@Override
-	public void engineStatusChanged(IExecutionEngine engineRunnable, RunStatus newStatus) {
-	}
-
-	@Override
-	public void engineAboutToStop(IExecutionEngine engine) {
-	}
-
-	@Override
-	public void stepExecuted(IExecutionEngine engine, Step<?> stepExecuted) {
-	}
-
-	@Override
-	public void proposedStepsChanged(IExecutionEngine engine, Collection<Step<?>> steps) {
-	}
-
-	@Override
-	public void engineAboutToDispose(IExecutionEngine engine) {
-	}
-
-	@Override
-	public List<String> validate(List<IEngineAddon> otherAddons) {
-		return new ArrayList<String>();
-	}
 }
diff --git a/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/IEngineAddon.java b/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/IEngineAddon.java
index 187ad8c24..c1a42429c 100644
--- a/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/IEngineAddon.java
+++ b/framework/framework_commons/plugins/org.eclipse.gemoc.xdsmlframework.api/src/org/eclipse/gemoc/xdsmlframework/api/engine_addon/IEngineAddon.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2017 Inria and others.
+ * Copyright (c) 2016 Inria and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -10,6 +10,7 @@
  *******************************************************************************/
 package org.eclipse.gemoc.xdsmlframework.api.engine_addon;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
@@ -23,49 +24,58 @@ public interface IEngineAddon {
 	/**
 	 * Operation called before the engine starts
 	 */
-	public void engineAboutToStart(IExecutionEngine engine);
+	default public void engineAboutToStart(IExecutionEngine engine) {
+	};
 
 	/**
 	 * Operation called after the engine have started
 	 */
-	public void engineStarted(IExecutionEngine executionEngine);
+	default public void engineStarted(IExecutionEngine executionEngine) {
+	};
 
 	default public void engineInitialized(IExecutionEngine executionEngine) {
-		
-	}
-	
-	public void engineAboutToStop(IExecutionEngine engine);
+	};
+
+	default public void engineAboutToStop(IExecutionEngine engine) {
+	};
 
 	/**
 	 * Operation called after the engine has been stopped
 	 */
-	public void engineStopped(IExecutionEngine engine);
+	default public void engineStopped(IExecutionEngine engine) {
+	};
 
-	
 	/**
 	 * Operation before the engine has been disposed (and after the engine has
 	 * been stopped)
 	 */
-	public void engineAboutToDispose(IExecutionEngine engine);
+	default public void engineAboutToDispose(IExecutionEngine engine) {
+	};
 
 	/**
 	 * Operation called before the Step has been chosen
 	 */
-	public void aboutToSelectStep(IExecutionEngine engine, Collection<Step<?>> steps);
+	default public void aboutToSelectStep(IExecutionEngine engine, Collection<Step<?>> steps) {
+	};
 
-	public void proposedStepsChanged(IExecutionEngine engine, Collection<Step<?>> steps);
+	default public void proposedStepsChanged(IExecutionEngine engine, Collection<Step<?>> steps) {
+	};
 
 	/**
 	 * Operation called after the Step has been chosen It also returns the
 	 * chosen Step
 	 */
-	public void stepSelected(IExecutionEngine engine, Step<?> selectedStep);
+	default public void stepSelected(IExecutionEngine engine, Step<?> selectedStep) {
+	};
 
-	public void aboutToExecuteStep(IExecutionEngine engine, Step<?> stepToExecute);
+	default public void aboutToExecuteStep(IExecutionEngine engine, Step<?> stepToExecute) {
+	};
 
-	public void stepExecuted(IExecutionEngine engine, Step<?> stepExecuted);
+	default public void stepExecuted(IExecutionEngine engine, Step<?> stepExecuted) {
+	};
 
-	public void engineStatusChanged(IExecutionEngine engine, RunStatus newStatus);
+	default public void engineStatusChanged(IExecutionEngine engine, RunStatus newStatus) {
+	};
 
 	/**
 	 * This operation check the current addon compatibility with elements in
@@ -74,6 +84,8 @@ default public void engineInitialized(IExecutionEngine executionEngine) {
 	 * @return A list of error messages if the check failed or an empty list
 	 *         otherwise.
 	 */
-	public List<String> validate(List<IEngineAddon> otherAddons);
+	default public List<String> validate(List<IEngineAddon> otherAddons) {
+		return new ArrayList<String>();
+	};
 
-}
+}
\ No newline at end of file