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

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

*** 33,52 ****
--- 33,61 ----
  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]);