ClassNotFoundException

[carlphilipp]

Hello,

I just followed the documentation: Checkout the code, compile and run. I'm connected to my Hazelcast cluster, but I obtain that exception, when it tries to read from the nodes

WARNING: could not read stats from node [ #object[com.hazelcast.client.impl.MemberImpl 0x758a46a1 Member [XXXXXXXXX]:XXXX - d300a7fb-a00d-4b4d-8e82-78c93a01058b] ]: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: org.hface.InstanceStatsTask
Jun 15, 2017 2:24:52 PM clojure.tools.logging$eval1155$fn__1159 invoke
WARNING: could not read stats from node [ #object[com.hazelcast.client.impl.MemberImpl 0x5de34984 Member [XXXXXXXXX]:XXXX - 4e614058-c91d-4383-b972-65c6bf698590] ]: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: org.hface.InstanceStatsTask
Jun 15, 2017 2:24:52 PM clojure.tools.logging$eval1155$fn__1159 invoke

Any clue what it could be ?
Thanks,
Carl

[tolitius]

Hey Carl,

Sure. The idea is to monitor the cluster by distributing a "task" across all the Hazelcast nodes. This task would collect the stats and would report them back to hface.

The task is this little class: org.hface.InstanceStatsTask, which lives in this 8K dependency:

<dependency>
  <groupId>org.hface</groupId>
  <artifactId>hface-client</artifactId>
  <version>0.1.4</version>
</dependency>

Hence in order to be able to use hface with a Hazelcast cluster, this cluster would need to add this dependency, so when you start the cluster (nodes) they would know about this org.hface.InstanceStatsTask class.

[carlphilipp]

Hey tolitus,

Thanks for your answer! I will that when I can.

Carl

[majidgolshadi]

@tolitius
I want to run Hazelcast like a service and in order, to monitor, it's behavior I want to use hface so after clone Hazelcast from Github add this dependency

<dependency>
  <groupId>org.hface</groupId>
  <artifactId>hface-client</artifactId>
  <version>0.1.4</version>
</dependency>

at the end of all pom.xml dependencies and compile that I still get error

com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: org.hface.InstanceStatsTask

What I did wrong?
How can I use hface?

[tolitius]

just to understand better what you are doing:

• why clone hazelcast? you can create your own "server" node by having a small project with two dependencies: i.e. hazelcast and hface-client. changing hazelcast code does not sound right.

and compile that I still get error

• where and when do you get ClassNotFoundException?

• which hazelcast version are you trying it with?

[majidgolshadi]

Hello @tolitius
Thank you for response

• why clone Hazelcast? I cloned to add hface dependency in. I want to have each node with hface monitoring functionality
• where and when do you get? After compiling Hazelcast with hface dependency without any error and try to connect hface to each of Hazelcast node
• which Hazelcast version are you trying it with? hazelcast-3.10.1

[tolitius]

I created a sample for you, it is a hazecast server with the hface client dependency: https://github.com/tolitius/hface-server

[majidgolshadi]

@tolitius Thank you very much