catch TimeoutException during ping and do not delete yacy.conf during prereadconfigfile

found a situation after crash (reboot) with existing running semaphore but YaCy not running.
Ping generated exception which finally deleted the conf file (during pre-read procedure)
- change to ping (catch exception solved it)
- additionally removed delete yacy.conf file (if needed we need to make a backup)

source/net/yacy/cora/protocol/Scanner.java

@@ -151,7 +151,6 @@ public class Scanner {
                     }
                     if (access != Access.unknown) Scanner.this.services.put(this, access);
                 }
-            } catch (final ExecutionException e) {
             } catch (final OutOfMemoryError e) {
             }
         }

source/net/yacy/cora/protocol/TimeoutRequest.java

@@ -108,9 +108,9 @@ public class TimeoutRequest<E> {
      * @param uri
      * @param timeout
      * @return true if the server exists and replies within the given time-out
-     * @throws ExecutionException
      */
-    public static boolean ping(final String host, final int port, final int timeout) throws ExecutionException {
+    public static boolean ping(final String host, final int port, final int timeout) {
+        try {
             return new TimeoutRequest<Boolean>(new Callable<Boolean>() {
                 @Override
                 public Boolean call() {
@@ -135,6 +135,10 @@ public class TimeoutRequest<E> {
                     }
                 }
             }).call(timeout).booleanValue();
+            
+        } catch (ExecutionException ex) { // may happen on Timeout (see call)
+            return false;
+        }
     }
 
     /**

source/net/yacy/migration.java

@@ -74,12 +74,10 @@ public class migration {
         // ssl/https support currently on hardcoded default port 8443 (v1.67/9563)
         // make sure YaCy can start (disable ssl/https support if port is used)
         if (sb.getConfigBool("server.https", false)) {
-            try {
             if (TimeoutRequest.ping("127.0.0.1", 8443, 3000)) {
                 sb.setConfig("server.https", false);
                 ConcurrentLog.info("MIGRATION", "disabled https support (reason: default port 8443 already used)");
             }
-            } catch (ExecutionException ex) { }
         }
     }
     /*

source/net/yacy/search/Switchboard.java

@@ -68,7 +68,6 @@ import java.util.SortedSet;
 import java.util.TreeMap;
 import java.util.TreeSet;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -294,15 +293,12 @@ public final class Switchboard extends serverSwitch {
         sb = this;
         // check if port is already occupied
         final int port = getConfigInt("port", 8090);
-        try {
         if (TimeoutRequest.ping(Domains.LOCALHOST, port, 500)) {
             throw new RuntimeException(
                     "a server is already running on the YaCy port "
                     + port
                     + "; possibly another YaCy process has not terminated yet. Please stop YaCy before running a new instance.");
         }
-        } catch (final ExecutionException e1 ) {
-        }
 
         MemoryTracker.startSystemProfiling();
 

source/net/yacy/yacy.java

@@ -559,10 +559,12 @@ public final class yacy {
                         delete(lockFile);
                     }                                
                 }
-            } catch (Throwable ex) {
+            } catch (IOException ex) {
+                System.err.println("ERROR: config file seems to be corrupt");
+                System.err.println("ERROR: if problem persists, delete file");
+                System.err.println(configFile.getAbsolutePath());
                 ConcurrentLog.logException(ex);
-                ConcurrentLog.severe("Startup", "cannot read " + configFile.toString() + ", removing old file");
-                configFile.delete();
+                ConcurrentLog.severe("Startup", "cannot read " + configFile.toString() + ", please delete the corrupted file if problem persits");
             }
         }
     }