test/jdk/java/util/Locale/SoftKeys.java

rev 49197 : 8199009: test/jdk/java/util/Locale/SoftKeys.java fails with OutOfMemoryError
Reviewed-by: naoto

@@ -33,20 +33,29 @@
 public class SoftKeys {
 
     private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
 
     public static void main(String[] args) {
+        try {
         // With 4 characters in "language", we'll fill up a 16M heap quickly,
         // causing full GCs and SoftReference reclamation. Repeat at least two
         // times to verify no NPEs appear when looking up Locale's whose
         // softly referenced data in sun.util.locale.BaseLocale$Key might have
         // been cleared.
         for (int i = 0; i < 2; i++) {
             for (int j = 0; j < 512*1024; j++) {
                 new Locale(langForInt(j), "", "");
             }
         }
+        } catch (OutOfMemoryError e) {
+            // Can happen on some system configurations, and while increasing heap
+            // size would allow GC to keep up, it makes it impractically hard to
+            // reproduce NPE issues that could arise when references are being
+            // cleared. Do a System.gc() to try to reclaim enough memory to not
+            // throw an OOME again in the jtreg wrapper.
+            System.gc(); 
+        } 
     }
 
     private static String langForInt(int val) {
         StringBuilder buf = new StringBuilder(4);
         buf.append(CHARS[(val >> 12) & 0xF]);