I have a Java project that currently returns a map to Camel without any
nested key,value pairs, and the Jackson library marshalls it just fine into
JSON using the Jackson library.
For example if I put the following two key,values into a demoMap:
Map<String,String> demoMap = new TreeMap<String,String>
demoMap.put("key1","5");
demoMap.put("key2","10");
I get the following JSON:
{"key1":"5","key2":"10"}
However, now some of my key,value entries will have an optional visibility
that I need to put as a nested key value in my map. Any key,values that
don't have an optional visibility will use the default. So, for example if
I specify visibilities for key1, and key2, but not key3 I want to get JSON
out that looks like this:
{"key1":"5",
"key2":"10",
"key3":"17",
"visibility" : { "key1": "a&b&!c", "key2": "a&b", "_default": "a" }
}
How can I get Camel to marshall a Java object with nested key,value pairs?
I'm a visual learner, so a simple example would be helpful.
I tried changing my Map to have a value as an object i.e.,:
Map<String,Object> demoMap = new TreeMap<String,Object>
and then tried adding nested key,values for some keys with an ArrayList
using
http://examples.javacodegeeks.com/core-java/json/jackson/convert-java-map-to-from-json-using-jackson-example/
for reference, but realized that this just gives me a bunch of nested values
under a key, not a bunch of nested key,value pairs.
Even when I tried it for grins, I got an error from the Camel processor with
a java.lang.ClassCastException stating java.util.ArrayList cannot be cast to
java.lang.String
And similarly when I tried to nest a Map inside my demoMap I got this
ClassCastException:
3244 [hello.world.request.timer] ERROR
org.apache.camel.processor.DefaultErrorHandler - Failed delivery for
exchangeId: e6518e39-89b7-435e-96d9-ce26811ac67e. Exhausted after delivery
attempt: 1 caught: java.lang.ClassCastException: java.util.HashMap cannot be
cast to java.lang.String
So I know how NOT to do it. :-/
I re-read the Camel JSON documentation at http://camel.apache.org/json.html
but as of this writing it doesn't specify an example with nested key,value
pairs.
--
View this message in context:
http://camel.465427.n5.nabble.com/How-do-I-marshall-nested-key-value-pairs-into-JSON-with-Camel-and-Jackson-library-tp5741618.html
Sent from the Camel - Users mailing list archive at Nabble.com.
