diff --git a/src/fr/pandacube/java/logviewer/Main.java b/src/fr/pandacube/java/logviewer/Main.java
index f5697d6..7790e77 100644
--- a/src/fr/pandacube/java/logviewer/Main.java
+++ b/src/fr/pandacube/java/logviewer/Main.java
@@ -60,15 +60,25 @@ public class Main {
 				
 				long previousLength = 0;
 				while(true) {
-					if (reader.length() < previousLength) {
-						reader.seek(0);
-					}
 					if ((line = readUTF8LineFromFile(reader)) != null) {
 						outln(line);
-						previousLength = reader.length();
 					}
 					else {
-						Thread.sleep(10);
+						previousLength = reader.length();
+						reader.close();
+						Thread.sleep(250);
+						
+						// tant que l'exeption est lancée, on réessaye
+						for(;;) {
+							try {
+								reader = new RandomAccessFile(f, "r");
+								break;
+							} catch (FileNotFoundException e) {
+								Thread.sleep(250);
+							}
+						}
+						if (reader.length() >= previousLength)
+							reader.seek(previousLength);
 					}
 					
 				}
diff --git a/src/fr/pandacube/java/logviewer/test/Test.java b/src/fr/pandacube/java/logviewer/test/Test.java
index 121c0bc..d61d3e3 100644
--- a/src/fr/pandacube/java/logviewer/test/Test.java
+++ b/src/fr/pandacube/java/logviewer/test/Test.java
@@ -3,6 +3,9 @@ package fr.pandacube.java.logviewer.test;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileWriter;
+import java.nio.file.FileSystemException;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -42,11 +45,21 @@ public class Test {
 					
 					wr.write(randomLine());
 					wr.flush();
-					Thread.sleep(r.nextInt(10));
+					Thread.sleep(r.nextInt(50));
 					
-					if (r.nextInt(10) == 0) {
+					if (r.nextInt(100) == 0) {
 						wr.close();
-						f.delete();
+						
+						// tant que l'exeption est lancée, on réessaye
+						for(;;) {
+							try {
+								Files.move(f.toPath(), new File(r.nextInt(10)+".old").toPath(), StandardCopyOption.ATOMIC_MOVE);
+								break;
+							} catch (FileSystemException e) {
+								Thread.sleep(250);
+							}
+						}
+						
 						f.createNewFile();
 						wr = new BufferedWriter(new FileWriter(f));
 					}
@@ -82,7 +95,7 @@ public class Test {
 	
 	
 	private static Random r = new Random();
-	private static char[] chars = new char[] {' ', ' ', ' ', 'a', 'b', 'c', 'd', 'e', 'f', '♪', '♫', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
+	private static char[] chars = new char[] {' ', ' ', ' ', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
 	
 	public static String randomLine() {
 		int length = r.nextInt(100)+15;