applicationContext.xml

        <rest>
            <post uri="/atlas" consumes="application/json" produces="application/json" enableCORS="true">
                <to uri="direct:atlas"/>
            </post>
        </rest>

        <route id="atlas">
            <from uri="direct:atlas"/>

            <!-- Backup original Json-->
            <setProperty propertyName="rawJson">
                <simple>${body}</simple>
            </setProperty>

            <!-- parse json -->
            <unmarshal ref="gson"/>

            <!-- Store parsed Json-->
            <setProperty propertyName="rootJson">
                <simple>${body}</simple>
            </setProperty>

            <split>
                <simple>${body[pages]}</simple>

                <!-- Add layers property -->
                <to uri="bean:printMerge"/>

                <transform>
                    <simple>
                        { "layout": "${exchangeProperty.rootJson[layout]}",
                          "outputFormat": "${exchangeProperty.rootJson[outputFormat]}",
                          "attributes": {
                            "map": {
                              "projection": "${exchangeProperty.rootJson[srs]}",
                              "dpi": ${exchangeProperty.rootJson[dpi]},
                              "center": ${body[center]},
                              "scale": ${body[scale]},
                              "layers": ${exchangeProperty.layers}
                            }
                          }
                        }
                    </simple>
                </transform>

                <!-- Test Json validity -->
                <!--<marshal ref="gson"/>-->
                <!--<marshal ref="gson"/>-->
                <log message="${body}" loggingLevel="ERROR"/>

                <!--<marshal ref="gson"/>-->
                <to uri="file:///tmp/log?autoCreate=true"/>
            </split>

        </route>

PrintMerge.java

public class PrintMerge {


    @Handler
    public void merge(Exchange ex) throws JSONException {

        JSONObject page = new JSONObject(new JSONTokener(ex.getIn().getBody(String.class)));
        JSONArray layers = new JSONArray(new JSONTokener(ex.getProperty("layers", String.class)));
    }
}

web.xml

   <servlet>
        <servlet-name>CamelServlet</servlet-name>
        <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/apps/*</url-pattern>
    </servlet-mapping>