Can not get two instances to join same cluster even on same machine

Question

On a RedHat Linux box, I have failed to get two instances of coherence to join the same cluster. I have managed to get the muticast test tool to show that packets are being sent and received. To do this, I had to:
java -cp bin/tangasol.jar -Djava.net.preferIPv4Stack=true com.tangosol.net.MulticastTest
Wed Apr 15 21:02:45 WET 2009: Sent packet 1.
Wed Apr 15 21:02:45 WET 2009: Received test packet 1 from self (sent 7ms ago).
Wed Apr 15 21:02:47 WET 2009: Sent packet 2.
Wed Apr 15 21:02:47 WET 2009: Received test packet 2 from self
Wed Apr 15 21:02:49 WET 2009: Sent packet 3.
Wed Apr 15 21:02:49 WET 2009: Received test packet 3 from self (sent 1ms ago).
Wed Apr 15 21:02:51 WET 2009: Sent packet 4.
Wed Apr 15 21:02:51 WET 2009: Received test packet 4 from self
However, I could not get the following to show that two instances are joining the same cluster... When I start to instances, both of them create a new cluster with only one member in each.
java -Djava.net.preferIPv4Stack=true -jar lib/coherence.jar
and obviously, when I try to start two instances of the sample application, I get the same problem.
java -cp ./lib/coherence.jar:./lib/tangosol.jar:./examples/java -Djava.net.preferIPv4Stack=true -Dtangosol.coherence.localhost=172.16.27.10 -Dtangosol.coherence.localport=8188 -Dtangosol.coherence.cacheconfig=/cache/explore-config.xml com.tangosol.examples.explore.SimpleCacheExplorer

Answer 1

Thanks for that... I ran:
jdk1.6.0_13/bin/java -Dtangosol.coherence.log.level=6 -Dtangosol.coherence.log=/my1.log -Dtangosol.ccacheconfig=/cache/explore-config.xml -Djava.net.preferIPv4Stack=true -jar lib/coherence.jar
and then
jdk1.6.0_13/bin/java -Dtangosol.coherence.log.level=6 -Dtangosol.coherence.log=/my2.log -Dtangosol.ccacheconfig=/cache/explore-config.xml -Djava.net.preferIPv4Stack=true -jar lib/coherence.jar
from the same machine and get the following from the log file of the second run (my2.log)
Oracle Coherence Version 3.4.2/411
Grid Edition: Development mode
Copyright (c) 2000-2009 Oracle. All rights reserved.
2009-04-16 06:53:11.574/0.625 Oracle Coherence GE 3.4.2/411 <Warning> (thread=main, member=n/a): UnicastUdpSocket failed to set receive buffer size to 1428 packets (2096304 bytes); actual size is 89 packets (131071 bytes). Consult your OS documentation regarding increasing the maximum socket buffer size. Proceeding with the actual value may cause sub-optimal performance.
2009-04-16 06:53:11.660/0.711 Oracle Coherence GE 3.4.2/411 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
2009-04-16 06:53:14.892/3.943 Oracle Coherence GE 3.4.2/411 <Info> (thread=Cluster, member=n/a): Created a new cluster "cluster:0x2FFB" with Member(Id=1, Timestamp=2009-04-16 06:53:11.58, Address=192.168.1.7:8089, MachineId=26887, Location=process:3514, Role=CoherenceConsole, Edition=Grid Edition, Mode=Development, CpuCount=8, SocketCount=2) UID=0xC0A8010700000120ADB3521C69071F99
SafeCluster: Name=cluster:0x2FFB
Group{Address=224.3.4.2, Port=34411, TTL=4}
MasterMemberSet
ThisMember=Member(Id=1, Timestamp=2009-04-16 06:53:11.58, Address=192.168.1.7:8089, MachineId=26887, Location=process:3514, Role=CoherenceConsole)
OldestMember=Member(Id=1, Timestamp=2009-04-16 06:53:11.58, Address=192.168.1.7:8089, MachineId=26887, Location=process:3514, Role=CoherenceConsole)
ActualMemberSet=MemberSet(Size=1, BitSetCount=2
Member(Id=1, Timestamp=2009-04-16 06:53:11.58, Address=192.168.1.7:8089, MachineId=26887, Location=process:3514, Role=CoherenceConsole)
RecycleMillis=120000
RecycleSet=MemberSet(Size=0, BitSetCount=0
Services
TcpRing{TcpSocketAccepter{State=STATE_OPEN, ServerSocket=192.168.1.7:8089}, Connections=[]}
ClusterService{Name=Cluster, State=(SERVICE_STARTED, STATE_JOINED), Id=0, Version=3.4, OldestMemberId=1}
the contents of the xml file are:
<?xml version="1.0"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
<caching-scheme-mapping>
<!--
Caches with any name will be created as default replicated.
-->
<cache-mapping>
<cache-name>*</cache-name>
<scheme-name>default-replicated</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
<!--
Default Replicated caching scheme.
-->
<replicated-scheme>
<scheme-name>default-replicated</scheme-name>
<service-name>ReplicatedCache</service-name>
<backing-map-scheme>
<class-scheme>
<scheme-ref>default-backing-map</scheme-ref>
</class-scheme>
</backing-map-scheme>
</replicated-scheme>
<!--
Default backing map scheme definition used by all
The caches that do not require any eviction policies
-->
<class-scheme>
<scheme-name>default-backing-map</scheme-name>
<class-name>com.tangosol.util.SafeHashMap</class-name>
</class-scheme>
</caching-schemes>
</cache-config>