// also resolve properties and constant fields on embedded expressions
ProcessorDefinition<?> me = (ProcessorDefinition<?>) this;
if (me instanceof ExpressionNode) {
ExpressionNode exp = (ExpressionNode) me;
ExpressionDefinition expressionDefinition = exp.getExpression();
if (expressionDefinition != null) {
// resolve properties before we create the processor
resolvePropertyPlaceholders(routeContext, expressionDefinition);
// resolve constant fields (eg Exchange.FILE_NAME)