无法获取元数据:执行OData元数据请求失败

Question

我正在尝试从S4hana云读取数据。我在云铸造中配置了目标，其中身份验证类型为OAuth2SAMLBearerAssertion.。

我还编写了一个小servlet来使用VDM机制获取数据。

但是，当我调用端点时，会出现以下错误

 Caused by: com.sap.cloud.sdk.cloudplatform.connectivity.TokenRequestFailedException: Failed to get access token: no valid JWT bearer found in "Authorization" header of request.
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     at com.sap.cloud.sdk.cloudplatform.connectivity.TokenRequest.getCurrentJwt(TokenRequest.java:308)
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     at com.sap.cloud.sdk.cloudplatform.connectivity.TokenRequest.requestTokenWithUserTokenGrant(TokenRequest.java:352)
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     at com.sap.cloud.sdk.cloudplatform.connectivity.XsuaaService.requestAccessToken(XsuaaService.java:135)
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     at com.sap.cloud.sdk.cloudplatform.connectivity.XsuaaService.getServiceToken(XsuaaService.java:197)
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     at com.sap.cloud.sdk.cloudplatform.connectivity.DestinationServiceCommand.getAccessToken(DestinationServiceCommand.java:109)
   2018-10-09T15:34:52.84+0530 [APP/PROC/WEB/0] OUT     ... 31 common frames omitted

我跟踪了https://blogs.sap.com/2018/02/05/deep-dive-8-with-sap-s4hana-cloud-sdk-leverage-principal-propagation-via-oauth-2-when-consuming-a-business-api-from-s4hana-cloud/。

Answer 1

您是否设置了安全性/配置了应用程序路由器？

错误消息表示请求中缺少JWT。

另见：https://blogs.sap.com/2017/07/18/step-7-with-sap-s4hana-cloud-sdk-secure-your-application-on-sap-cloud-platform-cloudfoundry/