[FIXED JENKINS-19055]

The actual fix has been implemented over the last dozen or so commits

changelog.html

@@ -55,6 +55,9 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=rfe>
+    Slaves connected via Java Web Start now restart themselves when a connection to Jenkins is lost.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-19055">issue 19055</a>)
   <li class=bug>
     Faster rendering of views containing many items.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-18364">issue 18364</a>)