Route list can be empty ----------------------- Key: JGRP-2359 URL: https://issues.jboss.org/browse/JGRP-2359 Project: JGroups Issue Type: Bug Affects Versions: 4.1.1, 4.0.20 Reporter: Pedro Ruivo Assignee: Pedro Ruivo Priority: Major Fix For: 4.1.2, 4.0.21 The list of routes is changed without proper synchronization. One example, I got an empty list when in Infinispan when try to select the route to use: {code} Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:657) at java.util.ArrayList.get(ArrayList.java:433) at org.infinispan.remoting.transport.jgroups.SiteMasterPickerImpl.pickRoute(SiteMasterPickerImpl.java:26) at org.jgroups.protocols.relay.Relayer.getRoute(Relayer.java:126) at org.jgroups.protocols.relay.RELAY2.route(RELAY2.java:566) at org.jgroups.protocols.relay.RELAY2.down(RELAY2.java:425) at org.jgroups.stack.Protocol.down(Protocol.java:317) at org.jgroups.fork.ForkProtocol.down(ForkProtocol.java:42) at org.jgroups.fork.ForkProtocolStack.down(ForkProtocolStack.java:62) at org.jgroups.fork.ForkChannel.send(ForkChannel.java:222) at org.jgroups.fork.ForkChannel.send(ForkChannel.java:21) at org.infinispan.remoting.transport.jgroups.JGroupsTransport.send(JGroupsTransport.java:1035) {code} One possible solution is to do a copy of the list before changing it in the view change method invocation (for the bridge)