The current commons bom version in the camunda connect pom was not updated.
after updating from alpha4 to alpha5, serialisation with spin fails because of a NoClassDefFoundError. (see attachment for stacktrace)
traced the issue to SpinEnsure
it extends org.camunda.commons.utils.EnsureUtil but the class is not found within the project files. (there is another EnsureUtils in org.camunda.bpm.engine.impl.util.)
mvn dependency:tree shows
adding a dependency on camunda-commons-utils:jar:1.0.4 fixes the issue