diff --git a/brouter-codec/src/main/java/btools/codec/MicroCache2.java b/brouter-codec/src/main/java/btools/codec/MicroCache2.java
index 8cd8f30..16223a1 100644
--- a/brouter-codec/src/main/java/btools/codec/MicroCache2.java
+++ b/brouter-codec/src/main/java/btools/codec/MicroCache2.java
@@ -15,7 +15,7 @@ public final class MicroCache2 extends MicroCache
   private int latBase;
   private int cellsize;
 
-  public MicroCache2( int size, byte[] databuffer, int lonIdx, int latIdx, int divisor ) throws Exception
+  public MicroCache2( int size, byte[] databuffer, int lonIdx, int latIdx, int divisor )
   {
     super( databuffer ); // sets ab=databuffer, aboffset=0
 
@@ -34,7 +34,7 @@ public final class MicroCache2 extends MicroCache
   	return b;
   }
 
-  public MicroCache2( StatCoderContext bc, DataBuffers dataBuffers, int lonIdx, int latIdx, int divisor, TagValueValidator wayValidator, WaypointMatcher waypointMatcher ) throws Exception
+  public MicroCache2( StatCoderContext bc, DataBuffers dataBuffers, int lonIdx, int latIdx, int divisor, TagValueValidator wayValidator, WaypointMatcher waypointMatcher )
   {
     super( null );
     cellsize = 1000000 / divisor;
diff --git a/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffManager.java b/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffManager.java
index 86ff392..3b33904 100644
--- a/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffManager.java
+++ b/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffManager.java
@@ -8,8 +8,10 @@ package btools.mapaccess;
 import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.IOException;
 import java.security.DigestInputStream;
 import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 
 final public class Rd5DiffManager
 {
@@ -93,30 +95,31 @@ final public class Rd5DiffManager
     }
   }
 
-  public static String getMD5( File f ) throws Exception
+  public static String getMD5( File f ) throws IOException
   {
-    MessageDigest md = MessageDigest.getInstance("MD5");
-    BufferedInputStream bis = new BufferedInputStream( new FileInputStream( f ) );
-    DigestInputStream dis = new DigestInputStream(bis, md);
-    byte[] buf = new byte[8192];
-    for(;;)
-    {
-      int len = dis.read( buf );
-      if ( len <= 0 )
-      {
-        break;
+    try {
+      MessageDigest md = MessageDigest.getInstance("MD5");
+      BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
+      DigestInputStream dis = new DigestInputStream(bis, md);
+      byte[] buf = new byte[8192];
+      for (; ; ) {
+        int len = dis.read(buf);
+        if (len <= 0) {
+          break;
+        }
       }
-    }
-    dis.close();
-    byte[] bytes = md.digest();
+      dis.close();
+      byte[] bytes = md.digest();
 
-    StringBuilder sb = new StringBuilder();
-    for (int j = 0; j < bytes.length; j++)
-    {
-      int v = bytes[j] & 0xff;
-      sb.append( hexChar( v >>> 4 ) ).append( hexChar( v & 0xf ) );
+      StringBuilder sb = new StringBuilder();
+      for (int j = 0; j < bytes.length; j++) {
+        int v = bytes[j] & 0xff;
+        sb.append(hexChar(v >>> 4)).append(hexChar(v & 0xf));
+      }
+      return sb.toString();
+    } catch (NoSuchAlgorithmException e) {
+      throw new IOException("MD5 algorithm not available", e);
     }
-    return sb.toString();
   }
   
   private static char hexChar( int v )
diff --git a/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffTool.java b/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffTool.java
index ac2f1d9..e1e48c6 100644
--- a/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffTool.java
+++ b/brouter-mapaccess/src/main/java/btools/mapaccess/Rd5DiffTool.java
@@ -12,6 +12,7 @@ import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
+import java.io.IOException;
 import java.util.Arrays;
 
 import btools.codec.DataBuffers;
@@ -60,7 +61,7 @@ final public class Rd5DiffTool implements ProgressListener
               return false;
             }
 
-  private static long[] readFileIndex( DataInputStream dis, DataOutputStream dos ) throws Exception
+  private static long[] readFileIndex( DataInputStream dis, DataOutputStream dos ) throws IOException
   {
     long[] fileIndex = new long[25];
     for( int i=0; i<25; i++ )
@@ -85,7 +86,7 @@ final public class Rd5DiffTool implements ProgressListener
     return index[tileIndex];
   }
 
-  private static int[] readPosIndex( DataInputStream dis, DataOutputStream dos ) throws Exception
+  private static int[] readPosIndex( DataInputStream dis, DataOutputStream dos ) throws IOException
   {
     int[] posIndex = new int[1024];
     for( int i=0; i<1024; i++ )
@@ -105,7 +106,7 @@ final public class Rd5DiffTool implements ProgressListener
     return idx == -1 ? 4096 : posIdx[idx];
   }
 
-  private static byte[] createMicroCache( int[] posIdx, int tileIdx, DataInputStream dis, boolean deltaMode ) throws Exception
+  private static byte[] createMicroCache( int[] posIdx, int tileIdx, DataInputStream dis, boolean deltaMode ) throws IOException
   {
     if ( posIdx == null )
     {
@@ -125,7 +126,7 @@ final public class Rd5DiffTool implements ProgressListener
     return ab;
   }
 
-  private static MicroCache createMicroCache( byte[] ab, DataBuffers dataBuffers ) throws Exception
+  private static MicroCache createMicroCache( byte[] ab, DataBuffers dataBuffers )
   {
     if ( ab == null || ab.length == 0 )
     {
@@ -286,7 +287,7 @@ final public class Rd5DiffTool implements ProgressListener
   }
 
 
-  public static void recoverFromDelta( File f1, File f2, File outFile, ProgressListener progress /* , File cmpFile */ ) throws Exception
+  public static void recoverFromDelta( File f1, File f2, File outFile, ProgressListener progress /* , File cmpFile */ ) throws IOException
   {
     if ( f2.length() == 0L )
     {
@@ -468,7 +469,7 @@ final public class Rd5DiffTool implements ProgressListener
     }
   }
 
-  public static void copyFile( File f1, File outFile, ProgressListener progress ) throws Exception
+  public static void copyFile( File f1, File outFile, ProgressListener progress ) throws IOException
   {
     boolean canceled = false;
     DataInputStream dis1 = new DataInputStream( new BufferedInputStream( new FileInputStream( f1 ) ) );
@@ -756,7 +757,7 @@ final public class Rd5DiffTool implements ProgressListener
       this.dataBuffers = dataBuffers;
     }
 
-    public MicroCache readMC() throws Exception
+    public MicroCache readMC() throws IOException
     {
       if (skips < 0 )
       {
@@ -775,7 +776,7 @@ final public class Rd5DiffTool implements ProgressListener
       return mc;
     }
 
-    public void finish() throws Exception
+    public void finish()
     {
       skips = -1;
     }