the cleanup process experienced a 100% CPU load situation and the loop

did not terminate:

Occurrences: 100
at java.util.HashMap$KeyIterator.next(HashMap.java:956)
at
net.yacy.cora.protocol.ConnectionInfo.cleanup(ConnectionInfo.java:300)
at
net.yacy.cora.protocol.ConnectionInfo.cleanUp(ConnectionInfo.java:293)
at net.yacy.search.Switchboard.cleanupJob(Switchboard.java:2212)
at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
net.yacy.kelondro.workflow.InstantBusyThread.job(InstantBusyThread.java:105)
at
net.yacy.kelondro.workflow.AbstractBusyThread.run(AbstractBusyThread.java:215)

This tries to fix the problem; the problem should be monitored

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

@@ -26,12 +26,10 @@
 package net.yacy.cora.protocol;
 
 import java.util.Collections;
-import java.util.ConcurrentModificationException;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
 
-
 /**
  * Information about a connection
  * 
@@ -296,12 +294,17 @@ public class ConnectionInfo implements Comparable<ConnectionInfo> {
     private static void cleanup(final Set<ConnectionInfo> connectionSet) {
     	final Iterator<ConnectionInfo> iter = connectionSet.iterator();
     	synchronized (iter) { 
-            while (iter.hasNext()) try {
-                ConnectionInfo con = iter.next();
-                if(con.getLifetime() > staleAfterMillis) {
-                	connectionSet.remove(con);
-                }
-            } catch (ConcurrentModificationException e) {}
+            while (iter.hasNext()) {
+                ConnectionInfo con = null;
+                try {
+                    con = iter.next();
+                } catch (Throwable e) {break;} // this must break because otherwise there is danger that the loop does never terminates
+                try {
+                    if (con.getLifetime() > staleAfterMillis) {
+                        connectionSet.remove(con);
+                    }
+                } catch (Throwable e) {continue;}
+            }
         }
     }