wso2-sample-claim-handler

To return groupid in OIDC id_token,

Build with mvn clean install
Paste the jar to <IS_HOME>/repository/component/dropins directory
Change <IS_HOME>/repository/conf/identity/application-authentication.xml as below
```
<ClaimHandler>org.wso2.custom.claim.CustomClaimHandler</ClaimHandler>
```
Restart the server