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SimpleObject root = new SimpleObject();
OgnlContext context =  (OgnlContext) Ognl.createDefaultContext(null);  
Node node =  (Node) Ognl.compileExpression(context, root, "user.name");
String userName = node.getAccessor().get(context, root);

You'll notice that this example references the new ognl.enhance.ExpressionAccessor class. This is the interface used to create the enhanced expression versions of any given expression via javassist and should be used to set/get expression values from the compiled versions of the code. Although the old Ognl.getValue(node, context, root) method of getting/setting values will correctly detect a compiled expression and use the accessor directly as well, it's not going to be as fast as you doing it directly.

 ognl.enhance.OgnlExpressionCompiler

The core class involved in doing the management of these expression compilations by default is ognl.enhance.ExpressionCompiler, which implements ognl.enhance.OgnlExpressionCompiler. Although you can in theory use this default implementation it is not recommended for more robust integration points - such as being incorporated within a web framework. The majority of examples here are going to be based around the strategy that Tapestry has used to integrate these new features.