7036666: test/com/sun/net/httpserver/Test9a.java fails intermittently

Summary: Additional stacktrace information is printed on failure
Reviewed-by: alanb, dfuchs, chegar

test/ProblemList.txt

@@ -160,9 +160,6 @@ javax/xml/jaxp/transform/jdk8004476/XSLTExFuncTest.java		windows-all
 # Filed 7052625
 com/sun/net/httpserver/bugs/6725892/Test.java                   generic-all
 
-# Filed 7036666
-com/sun/net/httpserver/Test9a.java                              generic-all
-
 # failing on vista 32/64 on nightly
 # 7102702
 java/net/PortUnreachableException/OneExceptionOnly.java         windows-all

test/com/sun/net/httpserver/Test9a.java

@@ -40,8 +40,9 @@ import javax.net.ssl.*;
 
 public class Test9a extends Test {
 
-    static SSLContext serverCtx, clientCtx;
-    static boolean error = false;
+    static SSLContext serverCtx;
+    static volatile SSLContext clientCtx = null;
+    static volatile boolean error = false;
 
     public static void main (String[] args) throws Exception {
         HttpsServer server = null;
@@ -176,6 +177,7 @@ public class Test9a extends Test {
                 compare (new File(orig), temp);
                 temp.delete();
             } catch (IOException e) {
+                e.printStackTrace();
                 error = true;
             }
         }