"Error: Could not find or load main class com.hazelcast.core.server.StartServer" on running the extended docker image for Hazelcast
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Manoj Khotele
Feb 19, 2016, 1:00:29 PM2/19/16
to Hazelcast
I followed the steps, as mentioned in https://hub.docker.com/r/hazelcast/hazelcast/, to build the extended docker image and then run it.
I get this error "Error: Could not find or load main class com.hazelcast.core.server.StartServer".
I don't get such an error, if I run non-extended i.e. "hazelcast/hazelcast:latest" image.
It's really perplexing.
Why should it stop finding main class com.hazelcast.core.server.StartServer?
Building a new docker image from original hazelcast image to include customized hazelcast.xml should neither move the class nor change the class-path. Right?
Manoj Khotele
Feb 19, 2016, 1:22:04 PM2/19/16
to Hazelcast
Just in case these log helps...
[ec2-user@ip-172-31-30-71 ~]$ sudo docker build -t ext-hz .
Sending build context to Docker daemon 8.192 kB
Step 1 : FROM hazelcast/hazelcast:latest
---> fe018aea2ca9
Step 2 : ADD hazelcast.xml $HZ_HOME
---> 231c73f87de9
Removing intermediate container 40dc39557351
Step 3 : CMD java -cp $HZ_HOME/hazelcast-$HZ_VERSION.jar com.hazelcast.core.serv er.StartServer
---> Running in f088ed53266a
---> 333c9b44eaa5
Removing intermediate container f088ed53266a
Successfully built 333c9b44eaa5
[ec2-user@ip-172-31-30-71 ~]$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
ext-hz latest 333c9b44eaa5 About a minute ago 598 MB
hazelcast/hazelcast latest fe018aea2ca9 3 weeks ago 598 MB
[ec2-user@ip-172-31-30-71 ~]$ sudo docker run 333c9b44eaa5
Manoj Khotele
Feb 19, 2016, 2:00:42 PM2/19/16
to Hazelcast
I myself found the problem.
To run the extended hazelcast docker image, running the class com.hazelcast.core.server.StartServer in Dockerfile should be avoided.
Just comment the last line of the Dockerfile i.e. "CMD java -cp $HZ_HOME/hazelcast-$HZ_VERSION.jar com.hazelcast.core.server.StartServer"; and it works.
Bilal Yasar
Mar 1, 2016, 4:36:47 PM3/1/16
to Hazelcast
Hi Manoj,
seems your hazelcast jar name was wrong. you can use this command:
CMD java -cp $HZ_HOME/hazelcast-all-$HZ_VERSION.jar com.hazelcast.core.server.StartServer
or simply use:
CMD ./server.sh
seems you already solved the problem, i just wanted to give information.
regards.
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