Digester digester = new Digester();
// Configure the digester as required
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource( "$", new HashMap<String, Object>() );
digester.setSubstitutor( new VariableSubstitutor( expander ) );
digester.addObjectCreate( "root", SimpleTestBean.class );
digester.addSetProperties( "root" );
// Parse our test input.