MS Graph API send mail v5-Intermittent issue 502 error

Question

Hi Team,

We are using MS graph API-Application type-Client credential flow to send mails. One of tenant faced intermittent failure while sending emails on Nov 25th 2024 for 3 hrs and customer want to know reason behind this. As issue was intermittent, we could not find root cause as it was working fine later.Please check error log below and let us know.

Below error log:

"[11/25/24 12:32:50:325 CET] 00000299 global E com.microsoft.graph.logger.DefaultLogger logError CoreHttpProvider[sendRequestInternal] - 408Graph service exception

[11/25/24 12:32:50:326 CET] 00000299 global E com.microsoft.graph.logger.DefaultLogger logError Throwable detail: com.microsoft.graph.http.GraphFatalServiceException: Unexpected exception returned from the service.Error code: UnknownError

Error message:

POST https://graph.microsoft.com/v1.0/users/xxxxxx/microsoft.graph.sendMail

SdkVersion : graph-java/v5.55.0

[...]

502 :

[...]

[Some information was truncated for brevity, enable debug logging for more details]

[11/25/24 12:32:50:327 CET] 00000299 ServletWrappe E com.ibm.ws.webcontainer.servlet.ServletWrapper service SRVE0068E: An exception was thrown by one of the service methods of the servlet [com.volvo.grphapi.servlet.SendServlet] in application [vmailapiprod-prd_ugraphapi]. Exception created : [com.microsoft.graph.http.GraphFatalServiceException: Unexpected exception returned from the service.Error code: UnknownError

Error message:

POST https://graph.microsoft.com/v1.0/users/xxxxx/microsoft.graph.sendMail

SdkVersion : graph-java/v5.55.0

[...]

502 :

[...]

[Some information was truncated for brevity, enable debug logging for more details]

at com.microsoft.graph.http.GraphServiceException.createFromResponse(GraphServiceException.java:408)

at com.microsoft.graph.http.GraphServiceException.createFromResponse(GraphServiceException.java:378)

at com.microsoft.graph.http.CoreHttpProvider.handleErrorResponse(CoreHttpProvider.java:512)

at com.microsoft.graph.http.CoreHttpProvider.processResponse(CoreHttpProvider.java:442)

at com.microsoft.graph.http.CoreHttpProvider.sendRequestInternal(CoreHttpProvider.java:408)

at com.microsoft.graph.http.CoreHttpProvider.send(CoreHttpProvider.java:225)

at com.microsoft.graph.http.CoreHttpProvider.send(CoreHttpProvider.java:202)

at com.microsoft.graph.http.BaseRequest.send(BaseRequest.java:335)

at com.microsoft.graph.requests.UserSendMailRequest.post(UserSendMailRequest.java:54)

at com.volvo.grphapi.servlet.SendServlet.doPost(SendServlet.java:390)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1235)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:779)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)

at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)

at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1134)

at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:82)

at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:966)

at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)

at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:382)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:465)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:532)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:318)

at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)

at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1833)

at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)

at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)

at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)

at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)

at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)

at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)

at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)

at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1909)

]

[11/25/24 12:32:50:329 CET] 00000299 LocalTranCoor E WLTC0017E: Resources rolled back due to setRollbackOnly() being called.

[11/25/24 12:32:50:331 CET] 00000299 webapp E com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E: [Servlet Error]-[com.volvo.grphapi.servlet.SendServlet]: com.microsoft.graph.http.GraphFatalServiceException: Unexpected exception returned from the service.Error code: UnknownError

Error message:

POST https://graph.microsoft.com/v1.0/users/xxxxxx/microsoft.graph.sendMail

SdkVersion : graph-java/v5.55.0

[...]

502 :

[...]

[Some information was truncated for brevity, enable debug logging for more details]

at com.microsoft.graph.http.GraphServiceException.createFromResponse(GraphServiceException.java:408)

at com.microsoft.graph.http.GraphServiceException.createFromResponse(GraphServiceException.java:378)

at com.microsoft.graph.http.CoreHttpProvider.handleErrorResponse(CoreHttpProvider.java:512)

at com.microsoft.graph.http.CoreHttpProvider.processResponse(CoreHttpProvider.java:442)

at com.microsoft.graph.http.CoreHttpProvider.sendRequestInternal(CoreHttpProvider.java:408)

at com.microsoft.graph.http.CoreHttpProvider.send(CoreHttpProvider.java:225)

at com.microsoft.graph.http.CoreHttpProvider.send(CoreHttpProvider.java:202)

at com.microsoft.graph.http.BaseRequest.send(BaseRequest.java:335)

at com.microsoft.graph.requests.UserSendMailRequest.post(UserSendMailRequest.java:54)

at com.volvo.grphapi.servlet.SendServlet.doPost(SendServlet.java:390)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1235)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:779)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)

at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)

at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1134)

at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:82)

at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:966)

at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)

at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:382)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:465)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:532)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:318)

at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)

at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1833)

at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)

at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)

at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)

at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)

at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)

at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)

at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)

at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1909)"