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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);

...

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.

 Tapestry OGNL Integration

There are only small handful of classes/services involved in the Tapestry implementation of these features, so hopefully using them as a reference will help anyone trying to get started with this:

• org.apache.tapestry.services.impl.HiveMindExpressionCompiler The Tapestry implementation of ognl.enhance.OgnlExpressionCompiler - which is a subclass of the ognl.enhance.ExpressionCompiler default implementation.