src/jdk.compiler/share/classes/com/sun/source/util/DocTrees.java

*** 45,54 ****
--- 45,59 ----
   *
   * @since 1.8
   */
  public abstract class DocTrees extends Trees {
      /**
+      * Constructor for subclasses to call.
+      */
+     public DocTrees() {}
+ 
+     /**
       * Returns a DocTrees object for a given CompilationTask.
       * @param task the compilation task for which to get the Trees object
       * @return the DocTrees object
       * @throws IllegalArgumentException if the task does not support the Trees API.
       */