From Stuart Monteith,
Hi,
 I just noticed I have hit this problem.

HelpTree in jtharness-5.0.jar has this:
  private java.util.Comparator nodeComparator;
Whereas in jtharness-4.6.jar it has:
  private static java.util.Comparator nodeComparator;

i.e. the nodeComparator field is no longer a static field.

This happened since adopt-openjdk started building with this:
    https://adopt-openjdk.ci.cloudbees.com/job/jtharness/lastSuccessfulBuild/artifact/jtharness-5.0.tar.gz

BR,
  Stuart

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# HG changeset patch
# User smonteith
# Date 1498059859 -3600
# Wed Jun 21 16:44:19 2017 +0100
# Node ID 75cda45229ca989faf3e8ba83f45ccb951b1bb8f
# Parent 33d0a6d64b82f5ca23b7b1eaadf74317b2204ecf
Fix HelpTree field access

diff -r 33d0a6d64b82 -r 75cda45229ca
src/share/classes/com/sun/javatest/regtest/tool/Help.java
--- a/src/share/classes/com/sun/javatest/regtest/tool/Help.java Mon
Jun 12 14:35:46 2017 -0700
+++ b/src/share/classes/com/sun/javatest/regtest/tool/Help.java Wed
Jun 21 16:44:19 2017 +0100
@@ -329,7 +329,7 @@
         try{
             Field f = HelpTree.class.getDeclaredField("nodeComparator");
             f.setAccessible(true);
- f.set(null, new NodeComparator());
+ f.set(commandHelpTree, new NodeComparator());
         } catch (IllegalAccessException | IllegalArgumentException |
NoSuchFieldException | SecurityException ignore) {
         }