Hi. Struggling with the filter xpath example

[davesargrad]

I'm starting to work through the examples in the book. I've found the filter xpath to be difficult to get working. I've tried several iterations at this point. I've also verified my xpath online.

I've tried several variants (starting with the filter on "test attribute" provided in the book).

In general, my filter drops all the messages. They make it to the outbox if I eliminate the filter.

Here is a filter that i think should work (checking value of an element rather than an attribute)

The XML (inbox/order4.xml)

<?xml version="1.0" encoding="UTF-8"?>
<person><city>London</city></person>

The route

from("file:data/inbox?noop=true")
                        .log("Received order: ${header.CamelFileName}")
                        .filter().xpath("/person/city='London'")
                        .log("Please process valid order: ${header.CamelFileName}")
                        .to("file:data/outbox");

The output

I should see that order4 is procssed and placed in the outbox. Yet it isnt.

The online validation using an xpath tester:

What am I missing?

[davesargrad]

The following is the whole piece of code. You see the first filters i tried commented out, since they didnt seem to what i expected them to do.