Fixed NPE in API publisher client (#882)

components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/OAuthRequestInterceptor.java

@@ -101,6 +101,10 @@ public class OAuthRequestInterceptor implements RequestInterceptor {
                                                                       REQUIRED_SCOPE);
                 tenantBasedAccessTokenInfo.setExpiresIn(
                         System.currentTimeMillis() + (tenantBasedAccessTokenInfo.getExpiresIn() * 1000));
+                if (tenantBasedAccessTokenInfo.getScopes() == null) {
+                    throw new APIMClientOAuthException("Failed to retrieve scopes from access token");
+                }
+
                 if (tenantBasedAccessTokenInfo.getScopes().contains(APIM_SUBSCRIBE_SCOPE)) {
                     tenantUserTokenMap.put(username, tenantBasedAccessTokenInfo);
                 }

components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/exception/APIMClientOAuthException.java

@@ -35,7 +35,7 @@ public class APIMClientOAuthException extends RuntimeException {
         this.responseStatus = status;
     }
 
-    APIMClientOAuthException(String message) {
+    public APIMClientOAuthException(String message) {
         super(message);
     }