Hi, It looks like the application has Geronimo JCache spec [1] on the classpath. It's fully compatible with the original JCache spec on API level, but there are different serial versions on some of serializable classes. Please make sure that the same version is used on everywhere in the cluster.
In case you're using Maven, replacing Geronimo dependency with the the following should help: <dependency> <groupId>javax.cache</groupId> <artifactId>cache-api</artifactId> <version>1.0.0</version> </dependency> [1] http://search.maven.org/#artifactdetails%7Corg.apache.geronimo.specs%7Cgeronimo-jcache_1.0_spec%7C1.0-alpha-1%7Cbundle -Val -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Iginte-Exception-Failed-to-unmarshal-discovery-data-for-component-1-on-starting-server-from-console-E-tp8160p8239.html Sent from the Apache Ignite Users mailing list archive at Nabble.com.