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diff --git a/ext/java/PsychYamlTree.java b/ext/java/PsychYamlTree.java
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+/***** BEGIN LICENSE BLOCK *****
+ * Version: CPL 1.0/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Common Public
+ * License Version 1.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * Copyright (C) 2010 Charles O Nutter <headius@headius.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the CPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the CPL, the GPL or the LGPL.
+ ***** END LICENSE BLOCK *****/
+package org.jruby.ext.psych;
+
+import org.jruby.Ruby;
+import org.jruby.RubyClass;
+import org.jruby.RubyModule;
+import org.jruby.RubyObject;
+import org.jruby.anno.JRubyMethod;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+import static org.jruby.runtime.Visibility.*;
+
+public class PsychYamlTree {
+    public static void initPsychYamlTree(Ruby runtime, RubyModule psych) {
+        RubyModule visitors = (RubyModule)psych.getConstant("Visitors");
+        RubyClass visitor = (RubyClass)visitors.getConstant("Visitor");
+        RubyClass psychYamlTree = runtime.defineClassUnder("YAMLTree", visitor, RubyObject.OBJECT_ALLOCATOR, visitors);
+
+        psychYamlTree.defineAnnotatedMethods(PsychYamlTree.class);
+    }
+
+    @JRubyMethod(visibility = PRIVATE)
+    public static IRubyObject private_iv_get(ThreadContext context, IRubyObject self, IRubyObject target, IRubyObject prop) {
+        return target.getInstanceVariables().getInstanceVariable(prop.asJavaString());
+    }
+}