diff --git a/AlgebraicDataflowArchitectureModel/src/application/ApplicationWindow.java b/AlgebraicDataflowArchitectureModel/src/application/ApplicationWindow.java
index 780088e..d4a58e1 100644
--- a/AlgebraicDataflowArchitectureModel/src/application/ApplicationWindow.java
+++ b/AlgebraicDataflowArchitectureModel/src/application/ApplicationWindow.java
@@ -1,5 +1,12 @@
 package application;
 
+import java.io.IOException;
+import java.util.logging.FileHandler;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.logging.SimpleFormatter;
+
 import javax.swing.JFrame;
 
 import com.mxgraph.model.mxGeometry;
@@ -20,6 +27,7 @@
 public class ApplicationWindow extends JFrame {
 	private static final long serialVersionUID = -8690140317781055614L;
 	public static final String title = "Visual Modeling Tool";
+	public static final Logger logger = Logger.getLogger("dtram");
 		
 	private Editor editor = null;
 	private mxGraph graph = null;
@@ -33,6 +41,16 @@
 		setTitle(title);
 		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 		
+		try {
+			Handler fh = new FileHandler("dtram.log", true);
+			fh.setFormatter(new SimpleFormatter());
+			logger.addHandler(fh);
+		} catch (SecurityException | IOException e) {
+			e.printStackTrace();
+		}
+		logger.setLevel(Level.INFO);
+		logger.log(Level.INFO, "launched");
+		
 		// If you want to change the language, change here.
 		ApplicationLanguage.getInstance().setLocaleLanguage(ApplicationLanguage.JP);
 
@@ -56,6 +74,7 @@
 		new mxRubberband(graphComponent);
 		graph.setAllowDanglingEdges(false);
 		graph.setCellsDisconnectable(true);
+		graph.setDropEnabled(false);
 				
 		menuBar = new ApplicationMenuBar(this);
 		setJMenuBar(menuBar);