[WSO2 ESB] How to replace message body by a value of a property

Here is how to do it. This will replace message body by the value of "xmlfile" property.

	<property name="xmlfile" expression="get-property('registry', 'gov:/xml/body.xml')" type="OM" />
	<enrich>
	<source clone="true" xpath="get-property('xmlfile')" />
	<target type="body" />
	</enrich>

view raw syn.xml hosted with ❤ by GitHub

Make sure you set type="OM" in property. Otherwise you will get below error.

"ERROR - EnrichMediator Invalid Object type to be inserted into message body"

[WSO2 ESB] How to read a file from registry and store in a property

Here is how to do it. This will load body.xml file from governance registry, and store in 'xmlfile' property.

	<property name="xmlfile" expression="get-property('registry', 'gov:/xml/body.xml')" type="OM" />

view raw reg.xml hosted with ❤ by GitHub

Having 'registry' scope is the key here. Type is "OM" because it is an xml file.

Related:
How to read a file from registry

How to read a value from xml file stored in a registry

How to Split a JSON array in WSO2 ESB

Say you have this JSON array.

	{
	"users":[
	{"name":"X", "age":"10"},
	{"name":"Y", "age":"12"},
	{"name":"Z","age":"15"}
	]
	}

view raw input.json hosted with ❤ by GitHub

Now you want to split users, and call some backend service for each user. Here is how to do. (Here I'm logging each user details instead of calling a backend service.)

	<?xml version="1.0" encoding="UTF-8"?>
	<proxy xmlns="http://ws.apache.org/ns/synapse"
	name="JsonSplitterBlog"
	transports="https,http"
	statistics="disable"
	trace="disable"
	startOnLoad="true">
	<target>
	<inSequence>
	<payloadFactory media-type="json">
	<format>{"users":[{"name":"X", "age":"10"},{"name":"Y", "age":"12"},{"name":"Z","age":"15"}]}</format>
	<args/>
	</payloadFactory>
	<iterate continueParent="true" expression="//users">
	<target>
	<sequence>
	<log level="custom">
	<property name="Name is" expression="//users/name"/>
	<property name="Age is" expression="//users/age"/>
	</log>
	</sequence>
	</target>
	</iterate>
	</inSequence>
	</target>
	<description/>
	</proxy>

view raw SplitterProxy.xml hosted with ❤ by GitHub

Output will look like this.

[2015-08-18 15:49:27,200]  INFO - LogMediator Name is = X, Age is = 10
[2015-08-18 15:49:27,204]  INFO - LogMediator Name is = Y, Age is = 12
[2015-08-18 15:49:27,205]  INFO - LogMediator Name is = Z, Age is = 15

Hope this will be helpful to someone.

References
https://denuwanthi.wordpress.com/2015/06/03/wso2-esbaccess-an-array-defined-in-property-mediator/