Re: [jgroups-users] Using JGroups with Ehcache+Hibernate not working

On 26.03.19 17:55, Questions/problems related to using JGroups wrote:
> Thanks a lot. "-Djava.net.preferIPv4Stack=true"  worked :-)

For now... :-)  3.0.x is too old to be used in prod, IMO


> Regards,
> Ranjeeta
> 
> -----Original Message-----
> From: Questions/problems related to using JGroups <[email protected]>
> Sent: Tuesday, March 26, 2019 3:28 PM
> To: [email protected]
> Subject: Re: [jgroups-users] Using JGroups with Ehcache+Hibernate not working
> 
> I'm afraid I don't know how ehcache replication works, but the config looks really old, and JGroups version 3.0.x _is_ definitely too old!
> Isn't there a newer version of ehcache-jgroupsreplication-1.7.jar?
> 
> One thing to try is to force IPv4 addresses by setting -Djava.net.preferIPv4Stack=true.
> 
> 
> 
> On 26.03.19 09:54, Questions/problems related to using JGroups wrote:
>> Hi,
>>
>> We have multiple Java processes running on a single host that talk to a
>> single database using Hibernate. Later on the processes will run from
>> different hosts but for now everything runs on the same machine.
>> To improve our applications performance we decided to use Hibernate Second
>> Level Caching with Ehcache. Till here it works fine. But since we have
>> different java processes we need JGroups to sync the Ehcache in each
>> process. This is not working.
>>
>> Environment: Linux Red Hat Enterprise Linux Server release 6.8 (Santiago)
>> ehcache-2.10.5.jar
>> ehcache-jgroupsreplication-1.7.jar
>> hibernate-ehcache-4.3.11.Final.jar
>> jgroups-3.0.16.Final.jar
>> openjdk version "1.8.0_141"
>>
>> Attached is the ehcache.xml that has the configuration for JGroups
>> ehcache.xml <https://urldefense.proofpoint.com/v2/url?u=http-3A__jgroups.1086181.n5.nabble.com_file_t1834_ehcache.xml&d=DwICAg&c=BFpWQw8bsuKpl1SgiZH64Q&r=VK46Dhj8pF3c2pox3j1TyIsBWKLlVVyZyqWmoD0LhXM&m=vi7m8BEsUP8uOri7e3ztztXWUzMUBVg3tP0nzUKge8s&s=emK3k4NHmdVxJo6z_S2VJrH8LCYf9oOIZ8LlcUWmbRQ&e=>
>>
>> On starting the java processes we are able to see the EH_CACHE and other
>> related threads in JConsole, so I assume it is getting all the jars etc.
>> JConsole.PNG <https://urldefense.proofpoint.com/v2/url?u=http-3A__jgroups.1086181.n5.nabble.com_file_t1834_JConsole.PNG&d=DwICAg&c=BFpWQw8bsuKpl1SgiZH64Q&r=VK46Dhj8pF3c2pox3j1TyIsBWKLlVVyZyqWmoD0LhXM&m=vi7m8BEsUP8uOri7e3ztztXWUzMUBVg3tP0nzUKge8s&s=tJvf1BCeTPDMXBx6jYbz122z8InO4xFSn4DYayHFluE&e=>
>>
>> We are also able to see the UDP traffic. This means the packets are being
>> sent but probably not received.
>> #tcpdump -v udp port 45566
>> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535
>> bytes
>> 20:47:51.459913 IP6 (class 0x08, hlim 32, next-header UDP (17) payload
>> length: 85) fe80::5054:ff:fe63:b8dd.45566 > ff0e::e70c:1584.45566: [udp sum
>> ok] UDP, length 77
>>
>> Can someone please confirm if the configurations in the Ehcache.xml are
>> correct or not?
>> What multicast IP should we be using? We are aware of the reserved IPs and
>> not used from that list.
>> Apart from this do we have to do any other configurations for the network
>> etc.
>> I do not have much networking knowledge and new to JGroups as well.
>>
>> Thanks!
>>
>>
>>
>>
>>
>>
>>
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>>
>>
>> --
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>>
>>
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>>
> 

-- 
Bela Ban | http://www.jgroups.org