A Jtrix node is deployed on a particular version of the Java Platform. Equally, it is conceivable for a node to run multiple Java versions at the same time.
A node must refuse to run netlets with unsupported Java or Jtrix versions.
Over time, a node can change the Java Version(s) it supports. If support for a particular Java version is withdrawn by the node, netlets using that versions are required to terminate themselves.