« Return to Thread: Ehcache and JGroups connectiivity

Re: Ehcache and JGroups connectiivity

by William Drew-3 :: Rate this Message:

So I’ve finally returned and thanks to the excellent series of articles
by Ekke at http://ekkescorner.wordpress.com/blog-series/osgi-apps/ I was
able to capture logging information from JGroups and Ehcache.

On a high level I’m attempting to create a distributed cache using
Ehcache (com.springsource.net.sf.ehcache-1.5.0.jar) which in turn uses
JGroups (com.springsource.org.jgroups-2.5.1.jar) to replicate the data
across machines.

I currently have 2 machines running Felix 1.8.0 with the following bundles:

* · com.springsource.antlr-2.7.6.jar
* · com.springsource.ch.qos.logback.classic-0.9.15.jar
* · com.springsource.ch.qos.logback.core-0.9.15.jar
* · com.springsource.edu.emory.mathcs.backport-3.0.0.jar
* · com.springsource.javassist-3.3.0.ga.jar
* · com.springsource.javax.mail-1.4.1.jar
* · com.springsource.javax.servlet-2.5.0.jar
* · com.springsource.javax.xml.stream-1.0.1.jar
* · com.springsource.net.sf.cglib-2.1.3.jar
* · com.springsource.net.sf.ehcache-1.5.0.jar
* · com.springsource.net.sf.jsr107cache-1.0.0.jar
* · com.springsource.org.apache.commons.collections-3.2.0.ja
* · com.springsource.org.dom4j-1.6.1.jar
* · com.springsource.org.hibernate-3.3.1.GA-1.jar
* · com.springsource.org.jgroups-2.5.1.jar
* · com.springsource.slf4j.api-1.5.6.jar
* · com.springsource.slf4j.bridge-1.5.6.jar
* · com.springsource.slf4j.org.apache.log4j-1.5.6.jar
* · contextmanager-1.0-SNAPSHOT.jar
* · jcl-over-slf4j-1.5.6.jar
* · jgroupsFrag-1.0-SNAPSHOT.jar
* · JULToSLF4JBridgeFrag-1.0-SNAPSHOT.jar
* · LogbackFrag-1.0-SNAPSHOT.jar

When I take these same set of jars and run them in a standard JVM it
works fine. However when run them inside of Felix (or for that matter
Equinox or Knoplerfish) I get the following error:

*exception=java.lang.IllegalArgumentException:
java.lang.ClassNotFoundException:
net.sf.ehcache.distribution.jgroups.JGroupSerializable*

So it seems that the Ehache bundle is not able to find the
net.sf.ehcache.distribution.jgroups.JGroupSerializable which is in the
JGroups bundle.

So I figured I would create a fragment (jgroupsFrag-1.0-SNAPSHOT.jar)
that would provide this class to the Ehcache bundle. The following is
the manifest from this fragment.

Manifest-Version: 1.0
Private-Package: .
Bundle-ClassPath: .
Built-By: wdrew
Tool: Bnd-0.0.311
Bundle-Name: jgroupsFrag
Created-By: Apache Maven Bundle Plugin
Fragment-Host: com.springsource.org.jgroups
Bundle-Version: 1.0.0.SNAPSHOT
Build-Jdk: 1.6.0_13
Bnd-LastModified: 1246064720234
Bundle-ManifestVersion: 2
Bundle-SymbolicName: com.ss.mother.jgroupsFrag

Apparently I’m doing something wrong here because when I deploy/install
this fragment I still get the ClassNotFoundException above.

Any ideas where I’m going wrong with this?

William Drew wrote:

> Karl,
>
> Thanks for the quick response. I was hoping that it was something very
> simple so I didn't include detailed information. I'll get a more
> reasonable set of diagnostics and get back asap.
>
> Karl Pauls wrote:
>> Can you give us a little more information about what is going wrong
>> (like error messages etc.)? Furthermore, are you using the latest
>> version of felix or are you running on trunk?
>>
>> regards,
>>
>> Karl
>>
>> On Mon, Jun 1, 2009 at 10:22 PM, William Drew <solset@...>
>> wrote:
>>> I am attempting to use Ehcache within Felix to provide a distributed
>>> cache
>>> capability and using JGroups for the replication of the data between
>>> the
>>> JVMs. To ensure that my ehcache configuration was correct I ran the
>>> code
>>> outside of OSGi. The data is being successfully added to the cache and
>>> replicated across two JVMs running on separate machines.
>>>
>>> The problem is when I run this same code inside a bundle within
>>> Felix. The
>>> bundle is started successfully and it all runs fine except for the
>>> fact that
>>> I can not seem to get the same connection between the JVMs as I did
>>> when I
>>> ran them outside of Felix. JGroups does not seem to be able to
>>> connect when
>>> running inside the OSGi container.
>>>
>>> Is there some configuration settings within Felix that I need to set in
>>> order to enable network connections to be established? I'm sure there's
>>> something simple that I'm missing here.
>>>
>>>
>>>
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>>
>>
>>
>
>
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« Return to Thread: Ehcache and JGroups connectiivity