how to read json in a file and use jsonpath

[gmh]

 All,
In my sample code I am reading a json file and doing a jsonpath to do
content based routing.

Here is the simple route
 from("file:src/data2/test.json?noop=true")
                .choice()
               
.when(PredicateBuilder.isEqualTo(ExpressionBuilder.languageExpression("jsonpath",
"$.op"), ExpressionBuilder.constantExpression("i")))

 .log("UK message")
                .to("file:target/messages2/insert")
                .otherwise()
                .log("Other message")
                .to("file:target/messages2/others");

The file contains the following json file
{
 "ts": Timestamp(1415124334, 1),
"op": "i",
"ns": "test.products",
"o": {
"_id": ObjectId("5459156e7950e8c18c094992"),
"item": "card",
"qty": 15
}
}


The route has started according to the log but jsonpath does not work
What is wrong with my syntax?
Gordon



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