Apache Ignite requires that CacheStore classes should be in classpath on client nodes. Look at thread with the same question:

On Mon, Dec 11, 2017 at 6:28 PM, Naveen Kumar <naveen.bandaru@gmail.com> wrote:
Please make sure

class is on the server Ignite's CLASSPATH. OR You can just deploy the
JAR to $IGNITE_HOME/libs/user direcgtory

This should resolve

On Mon, Dec 11, 2017 at 8:52 PM, Mikael <mikael-aronsson@telia.com> wrote:
> Hi!
> I have a cache in a server node that is using a custom cache store for a
> JDBC database, when I connect a client node (running inside a
> Payara/Glassfish web application) to that server node I get a:
> class org.apache.ignite.IgniteCheckedException: Failed to find class with
> given class loader for unmarshalling (make sure same versions of all classes
> are available on all nodes or enable peer-class-loading)
> [clsLdr=WebappClassLoader (delegate=true; repositories=WEB-INF/classes/),
> cls=my_cache_store_class]
> And sure, that class is not there, but it's a client so the cache should not
> be there either and the cache store will not work in the client because
> there is no database there, so the question is if I am doing something wrong
> or should it be like that ? do I need to put the class in the client ? it
> will have references to other classes that are not there either so if it
> tries to unmarshal the cache store in the client it will not be a good idea.

Thanks & Regards,
Naveen Bandaru