src/share/classes/sun/font/SunLayoutEngine.java

*** 33,42 ****
--- 33,43 ----
  import sun.font.GlyphLayout.*;
  import java.awt.geom.Point2D;
  import java.lang.ref.SoftReference;
  import java.util.HashMap;
  import java.util.Locale;
+ import java.util.concurrent.ConcurrentHashMap;
  
  /*
   * different ways to do this
   * 1) each physical font2d keeps a hashtable mapping scripts to layout
   * engines, we query and fill this cache.
*** 127,139 ****
          return getEngine(new LayoutEngineKey(font, script, lang));
      }
  
    // !!! don't need this unless we have more than one sun layout engine...
      public LayoutEngine getEngine(LayoutEngineKey key) {
!         HashMap cache = (HashMap)cacheref.get();
          if (cache == null) {
!             cache = new HashMap();
              cacheref = new SoftReference(cache);
          }
  
          LayoutEngine e = (LayoutEngine)cache.get(key);
          if (e == null) {
--- 128,141 ----
          return getEngine(new LayoutEngineKey(font, script, lang));
      }
  
    // !!! don't need this unless we have more than one sun layout engine...
      public LayoutEngine getEngine(LayoutEngineKey key) {
!         // Using ConcurrentHashMap instead of HashMap to resolve 7027300
!         ConcurrentHashMap cache = (ConcurrentHashMap)cacheref.get();
          if (cache == null) {
!             cache = new ConcurrentHashMap();
              cacheref = new SoftReference(cache);
          }
  
          LayoutEngine e = (LayoutEngine)cache.get(key);
          if (e == null) {