WSO2 ESB: XML response in WSO2 REST API call not parsed

I wish did fix the issue. If you're providing the UI for your service in the Carbon admin console itself, which probably means you're extending/enhancing product functionality then yes, you must go down the path of writing OSGi bundles. Example: you're adding a new throttling algorithm which allow users to configure new throttling policies through the admin console which accepts many different parameters.
If you're developing functionality which will be used in a user level application, then you're not suppose to go down the OSGi path. Unless you're enhancing/modifying the platform you don't have to know anything about OSGi. For end users, when configuring the ESB, you don't have to write custom code unless your scenario cannot be configured with the existing mediators. ESB and DSS therefore follows a configuration driven approach (for end users) when you have to develop new services.

wish help you to fix your issue As you can see in this class, OAuth2TokenValidationRequestDTO does not have a method setTokenType. But it's inner class OAuth2AccessToken has.

Hope this helps Well. Until now there is no way to do this. The only workaround i can fin was to avoid using SAML by configuring the same user and tenant database used by the SSO provider to be used by the WSO2 product.

it helps some times It turned out to be a configuration issue. In the following file:
"[wso2is-5.2.0_HOME]\repository\conf\identity\identity.xml"

        <EventListener type="org.wso2.carbon.user.core.listener.UserOperationEventListener" name="org.wso2.carbon.identity.mgt.IdentityMgtEventListener" orderId="50" enable="true"/>