Zeppelin 0.6.2 Use GUI params to save arbitrary paragraph data between the interpreter restarts

ZeppelinPersistParagraphData.scala

// Shows how to persist paragraph data between spark interpreter restarts using Zeppelin GUI params storage
// Run it once, then restart interpreter and run again. Parameter "ax4_gui_param" shuld be restored
val ctx = z.getInterpreterContext
val param = ctx.getGui.getParams().get("ax4_gui_param")
if (param == null) {
    s"Parameter is not persisted. Setting initial value"
    ctx.getGui.getParams().put("ax4_gui_param","hello_gui_param")
} else {
    s"Parameter is restored from Zeppelin GUI params collection: $param"
}