Can not create new asset with WSO2 ESB - wso2

Question

I create custom proxy service in WSO2 ESB 490:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="write_2_greg"
transports="https,http"
statistics="disable"
trace="enable"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="json">
<format>
{"name":"2rest_test","context":"/ressttest2","type":"restservice","version":"1.0.0"}
</format>
<args/>
</payloadFactory>
<property name="DISABLE_CHUNKING"
value="true"
scope="axis2"
type="STRING"/>
<property name="Accept"
expression="$trp:Accept"
scope="default"
type="STRING"/>
<property name="messageType"
value="application/json"
scope="axis2"
type="STRING"/>
<property name="Authorization"
expression="fn:concat('Basic ',base64Encode('admin:admin'))"
scope="transport"
type="STRING"/>
<call>
<endpoint>
<http trace="enable"
method="POST"
uri-template="https://localhost:9443/governance/restservices"/>
</endpoint>
</call>
<property xmlns:ns="http://org.apache.synapse/xsd"
name="__Status"
expression="$axis2:HTTP_SC"
scope="default"
type="STRING"/>
<enrich>
<source type="body" clone="true"/>
<target type="property" property="res_body"/>
</enrich>
<log level="custom">
<property name="__Status" expression="$ctx:__Status"/>
<property name="res_body--" expression="get-property('res_body')"/>
</log>
</inSequence>
<outSequence/>
<faultSequence/>
</target>
<description/>
</proxy>
This simple proxy just create new restservice to GREG, it uses the GREG REST API. But when I run this proxy service, the GREG response 500 status code, and check GREG log, it seems Jackson error:
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not construct instance of org.wso2.carbon.governance.api.generic.dataobjects.GenericArtifact, problem: abstract types can only be instantiated with additional type information
at [Source: org.apache.cxf.transport.http.AbstractHTTPDestination$1#4d4489c7; line: 1, column: 1]
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
at org.codehaus.jackson.map.deser.StdDeserializationContext.instantiationException(StdDeserializationContext.java:212)
at org.codehaus.jackson.map.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:97)
at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2376)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1166)
at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:410)
at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBodyReader(JAXRSUtils.java:1262)
at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBody(JAXRSUtils.java:1209)
at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:757)
at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:716)
at org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:253)
... 40 more
But I can create new restservice used by "Advanced Rest Client Application"(Chrome plugin)
BTW, I test this by ESB 490 , GREG 510 and GREG 520 .
How can I achive this used by ESB?

Answer 1

After research the carbon-governace source code, I found that the method "isReadable" in class "org.wso2.carbon.governance.rest.api.internal.GenericArtifactMessageBodyReader"
#Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
if (GenericArtifact.class.getName().equals(type.getName()) || GovernanceArtifact.class.getName().
equals(type.getName())) {
if (MediaType.APPLICATION_JSON_TYPE.equals(mediaType) || MediaType.APPLICATION_XML_TYPE.equals(mediaType)) {
return true;
}
}
return false;
}
When post the json to request, this method is called to determine the MediaType. The MediaType accept
application/json
But the proxy I wrote it sent the content-type
application/json; charset=UTF-8
They aren't the same, so the method return false, and not process the json post.
I try to reset the ESB proxy content type like this:
<property name="messageType" value="application/json" scope="axis2" type="STRING"/>
<property name="ContentType" scope="default" type="STRING" value="application/json"/>
But the content-type still "application/json;charset=UTF-8"
I think this is the reson, but how can we fix it ?