--- old/src/java.base/share/classes/jdk/internal/misc/JavaLangAccess.java	2018-09-13 11:38:59.000000000 -0700
+++ new/src/java.base/share/classes/jdk/internal/misc/JavaLangAccess.java	2018-09-13 11:38:58.000000000 -0700
@@ -305,4 +305,10 @@
      * @throws IllegalArgumentException for malformed surrogates
      */
     byte[] getBytesUTF8NoRepl(String s);
+
+    /**
+     * Set the cause of Throwable
+     * @param cause set t's cause to new value
+     */
+    void setCause(Throwable t, Throwable cause);
 }