Principal Propagation to S/4 with App-To-App SSO - s4sdk

I'm unable to call S/4 with Principal Propagation when coming from an App-To-App SSO request. Is this scenario supported by the SDK?
We have an HTML5 app in SCP Neo, and a Java app in the same subaccount.
Our intention is to let the HTML5 app fetch the SAML2 token (from an external IdP), then forward the token to the Java app using App-To-App SSO, and ultimately call S/4 using Principal Propagation using the original SAML2 token (from the IdP).
Summarizing, the following is the request flow:
HTML5 app gets SAML2 token from external IdP
HTML5 app calls Java app via destination with App-To-App SSO
Java app calls S/4 via destination with Principal Propagation
Our expectation is that on step 3, the request to S/4 would use the SAML2 token from step 1. Instead, is seems SCP creates another SAML2 token when calling destination with App-To-App SSO.
With this configuration, the S/4 SDK is not able to fetch the metadata, and it doesn't even reach cloud connector. Instead, it fails to build the Principal Propagation header, raising an exception as presented in the stack trace below:
2019 06 13 14:21:05#+00#ERROR#com.sap.cloud.sdk.odatav2.connectivity.internal.ODataConnectivityUtil##anonymous#hystrix-***OMITTED***.persistence.CreateChangeMasterCommand\#t=\#u=-1#na#***OMITTED***#***OMITTED***#web#***OMITTED***#na#na#na#na#Error occurred during create operation of Type : com.sap.cloud.sdk.odatav2.connectivity.ODataException: Unable to fetch the metadata : Error fetching the metadata |
2019 06 13 14:21:05#+00#ERROR#com.sap.cloud.sdk.odatav2.connectivity.cache.metadata.GuavaMetadataCache##anonymous#hystrix-***OMITTED***.changemaster.persistence.CreateChangeMasterCommand\#t=\#u=-1#na#***OMITTED***#***OMITTED***#web#***OMITTED***#na#na#na#na#Error occurred while populating metadata : com.sap.cloud.sdk.cloudplatform.connectivity.exception.DestinationAccessException: Failed to get the request headers for destination 'srv_Fiori_PP' (request URI: http://fiorisrvpp:8200/sap/opu/odata/sap/API_CHANGEMASTER;v=2/$metadata).
at com.sap.cloud.sdk.cloudplatform.connectivity.ScpNeoDestination.getAuthenticationHeaders(ScpNeoDestination.java:317)
at com.sap.cloud.sdk.cloudplatform.connectivity.ScpNeoDestination.getHeaders(ScpNeoDestination.java:388)
at com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientWrapper.wrapRequest(HttpClientWrapper.java:88)
at com.sap.cloud.sdk.cloudplatform.connectivity.HttpClientWrapper.execute(HttpClientWrapper.java:99)
at com.sap.cloud.sdk.odatav2.connectivity.cache.metadata.GuavaMetadataCache.getEdm(GuavaMetadataCache.java:236)
at com.sap.cloud.sdk.odatav2.connectivity.cache.metadata.GuavaMetadataCache.getEdm(GuavaMetadataCache.java:155)
at com.sap.cloud.sdk.odatav2.connectivity.internal.ODataConnectivityUtil.readMetadataWithCSRF(ODataConnectivityUtil.java:65)
at com.sap.cloud.sdk.odatav2.connectivity.impl.ODataCreateRequestImpl.create(ODataCreateRequestImpl.java:193)
at com.sap.cloud.sdk.odatav2.connectivity.impl.ODataCreateRequestImpl.handleExecute(ODataCreateRequestImpl.java:391)
at com.sap.cloud.sdk.odatav2.connectivity.impl.ODataCreateRequestImpl.execute(ODataCreateRequestImpl.java:140)
at com.sap.cloud.sdk.odatav2.connectivity.impl.ODataCreateRequestImpl.execute(ODataCreateRequestImpl.java:361)
at com.sap.cloud.sdk.s4hana.datamodel.odata.helper.FluentHelperCreate.execute(FluentHelperCreate.java:163)
at ***OMITTED***.changemaster.persistence.CreateChangeMasterCommand.run(CreateChangeMasterCommand.java:42)
at ***OMITTED***.changemaster.persistence.CreateChangeMasterCommand.run(CreateChangeMasterCommand.java:14)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10327)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
at rx.Observable.unsafeSubscribe(Observable.java:10327)
at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10327)
at rx.internal.operators.OperatorSubscribeOn$SubscribeOnSubscriber.call(OperatorSubscribeOn.java:100)
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:56)
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:47)
at com.sap.cloud.sdk.cloudplatform.concurrency.ScpNeoUserSessionCallable.call(ScpNeoUserSessionCallable.java:78)
at com.sap.core.tenant.service.impl.TenantServiceImpl.execute(TenantServiceImpl.java:126)
at com.sap.cloud.account.impl.TenantContextImpl.execute(TenantContextImpl.java:49)
at com.sap.cloud.sdk.cloudplatform.concurrency.ScpNeoTenantCallable.call(ScpNeoTenantCallable.java:98)
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java:69)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:836)
Caused by: com.netflix.hystrix.exception.HystrixRuntimeException: com.sap.cloud.sdk.cloudplatform.connectivity.GetAuthHeadersCommand\#t=d1055fe8-b703-4672-aaf8-e84fd0456508\#u=\#srv_Fiori_PP failed and fallback disabled.
at com.netflix.hystrix.AbstractCommand.handleFallbackDisabledByEmittingError(AbstractCommand.java:1052)
at com.netflix.hystrix.AbstractCommand.getFallbackOrThrowException(AbstractCommand.java:878)
at com.netflix.hystrix.AbstractCommand.handleFailureViaFallback(AbstractCommand.java:1034)
at com.netflix.hystrix.AbstractCommand.access$700(AbstractCommand.java:60)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:621)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:601)
at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$3.onError(AbstractCommand.java:1194)
at rx.internal.operators.OperatorSubscribeOn$SubscribeOnSubscriber.onError(OperatorSubscribeOn.java:80)
at rx.observers.Subscribers$5.onError(Subscribers.java:230)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
at rx.observers.Subscribers$5.onError(Subscribers.java:230)
at com.netflix.hystrix.AbstractCommand$DeprecatedOnRunHookApplication$1.onError(AbstractCommand.java:1431)
at com.netflix.hystrix.AbstractCommand$ExecutionHookApplication$1.onError(AbstractCommand.java:1362)
at rx.observers.Subscribers$5.onError(Subscribers.java:230)
at rx.observers.Subscribers$5.onError(Subscribers.java:230)
at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
at rx.Observable.unsafeSubscribe(Observable.java:10327)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
... 30 common frames omitted
Caused by: com.sap.cloud.sdk.cloudplatform.connectivity.exception.DestinationAccessException: java.lang.IllegalArgumentException: No logged-in user
at com.sap.cloud.sdk.cloudplatform.connectivity.GetAuthHeadersCommand.getAuthenticationHeaders(GetAuthHeadersCommand.java:242)
at com.sap.cloud.sdk.cloudplatform.connectivity.GetAuthHeadersCommand.run(GetAuthHeadersCommand.java:125)
at com.sap.cloud.sdk.cloudplatform.connectivity.GetAuthHeadersCommand.run(GetAuthHeadersCommand.java:41)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
... 30 common frames omitted
Caused by: java.lang.IllegalArgumentException: No logged-in user
at com.sap.core.connectivity.apiext.impl.authentication.PrincipalInformationProvider.getGenericCredentials(PrincipalInformationProvider.java:125)
at com.sap.core.connectivity.apiext.impl.authentication.PrincipalInformationProvider.getPrincipalCredentials(PrincipalInformationProvider.java:51)
at com.sap.core.connectivity.apiext.impl.authentication.AuthenticationHeaderProviderImpl.getPrincipalPropagationHeader(AuthenticationHeaderProviderImpl.java:53)
at com.sap.cloud.sdk.cloudplatform.connectivity.GetAuthHeadersCommand.getAuthenticationHeaders(GetAuthHeadersCommand.java:198)
... 35 common frames omitted
I'm certain the cloud connector configuration (including trust configuration) is correct, since Principal Propagation works perfectly if I call the Java app directly. The issue only happens if the request comes from the HTML5 app.
Could you please help me understand why this scenario isn't working?
Thank you.

After consulting the SAP Cloud Platform team, I got the confirmation that this behavior is what is to be expected.
The following resources should provide more insight:
https://cloudplatform.sap.com/scenarios/usecases/principal-propagation.html
https://blogs.sap.com/2018/11/07/principal-propagation-setup-between-cloud-platform-and-on-premise-backend-system-part-2/
https://help.sap.com/viewer/cca91383641e40ffbe03bdc78f00f681/Cloud/en-US/c84d4d0b12d34890b334998185f49e88.html

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at io.quarkus.oidc.runtime.OidcProviderClient.lambda$getJsonWebKeySet$0(OidcProviderClient.java:54)
at io.smallrye.context.impl.wrappers.SlowContextualFunction.apply(SlowContextualFunction.java:21)
at io.smallrye.mutiny.operators.uni.UniOnItemTransform$UniOnItemTransformProcessor.onItem(UniOnItemTransform.java:36)
at io.smallrye.mutiny.vertx.AsyncResultUni.lambda$subscribe$1(AsyncResultUni.java:35)
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at io.vertx.core.impl.EventLoopContext.lambda$runOnContext$0(EventLoopContext.java:37)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:832)
Here are the configs I have put:
# OIDC Configuration
quarkus.oidc.auth-server-url=https://<HOST>/auth/realms/<REALM_NAME>
quarkus.oidc.client-id=<CLIENT_ID>
# quarkus.oidc.application-type=service
quarkus.oidc.credentials.secret=<SECRET>
quarkus.oidc.tls.verification=required
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quarkus.keycloak.policy-enforcer.enable=true
Anyone got an idea what's wrong here?
Thanks to a comment above I found this quarkus config here to be helpful:
quarkus.log.min-level=DEBUG
quarkus.log.category."io.quarkus.oidc".level=DEBUG
Which gave me this error:
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2019-09-12 19:34:41,300 WARN ActionStartXCommand:523 - SERVER[<hostname>] USER[hadoop] GROUP[-] TOKEN[] APP[<WorkflowName>] JOB[0000006-190911195656052-oozie-oozi-W] ACTION[0000006-190911195656052-oozie-oozi-W#ErrorHandler] Error starting action [ErrorHandler]. ErrorType [ERROR], ErrorCode [EM007], Message [EM007: Encountered an error while sending the email message over SMTP.]
org.apache.oozie.action.ActionExecutorException: EM007: Encountered an error while sending the email message over SMTP.
at org.apache.oozie.action.email.EmailActionExecutor.email(EmailActionExecutor.java:304)
at org.apache.oozie.action.email.EmailActionExecutor.validateAndMail(EmailActionExecutor.java:173)
at org.apache.oozie.action.email.EmailActionExecutor.start(EmailActionExecutor.java:112)
at org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:243)
at org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:68)
at org.apache.oozie.command.XCommand.call(XCommand.java:291)
at org.apache.oozie.command.wf.SignalXCommand.execute(SignalXCommand.java:459)
at org.apache.oozie.command.wf.SignalXCommand.execute(SignalXCommand.java:82)
at org.apache.oozie.command.XCommand.call(XCommand.java:291)
at org.apache.oozie.command.wf.ActionEndXCommand.execute(ActionEndXCommand.java:283)
at org.apache.oozie.command.wf.ActionEndXCommand.execute(ActionEndXCommand.java:62)
at org.apache.oozie.command.XCommand.call(XCommand.java:291)
at org.apache.oozie.command.wf.ActionCheckXCommand.execute(ActionCheckXCommand.java:244)
at org.apache.oozie.command.wf.ActionCheckXCommand.execute(ActionCheckXCommand.java:56)
at org.apache.oozie.command.XCommand.call(XCommand.java:291)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.oozie.service.CallableQueueService$CallableWrapper.run(CallableQueueService.java:210)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: <hostname>, port: 25;
nested exception is:
java.net.ConnectException: Connection refused (Connection refused)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
When we check the application logs, we get the below error
Launcher AM execution failed
java.lang.UnsupportedOperationException: Not implemented by the S3FileSystem FileSystem implementation
at org.apache.hadoop.fs.FileSystem.getScheme(FileSystem.java:216)
at org.apache.hadoop.fs.FileSystem.loadFileSystems(FileSystem.java:2564)
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2574)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:91)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2630)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2612)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
at org.apache.oozie.action.hadoop.FSLauncherURIHandler.create(FSLauncherURIHandler.java:36)
at org.apache.oozie.action.hadoop.PrepareActionsHandler.execute(PrepareActionsHandler.java:86)
at org.apache.oozie.action.hadoop.PrepareActionsHandler.prepareAction(PrepareActionsHandler.java:73)
at org.apache.oozie.action.hadoop.LauncherAM.executePrepare(LauncherAM.java:371)
at org.apache.oozie.action.hadoop.LauncherAM.access$000(LauncherAM.java:55)
at org.apache.oozie.action.hadoop.LauncherAM$2.run(LauncherAM.java:220)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1642)
at org.apache.oozie.action.hadoop.LauncherAM.run(LauncherAM.java:217)
at org.apache.oozie.action.hadoop.LauncherAM$1.run(LauncherAM.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1642)
at org.apache.oozie.action.hadoop.LauncherAM.main(LauncherAM.java:141)
Exception in thread "main" java.lang.UnsupportedOperationException: Not implemented by the S3FileSystem FileSystem implementation
at org.apache.hadoop.fs.FileSystem.getScheme(FileSystem.java:216)
at org.apache.hadoop.fs.FileSystem.loadFileSystems(FileSystem.java:2564)
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2574)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:91)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2630)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2612)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
at org.apache.hadoop.io.SequenceFile$Writer.<init>(SequenceFile.java:1060)
at org.apache.hadoop.io.SequenceFile$RecordCompressWriter.<init>(SequenceFile.java:1371)
Hadoop distribution:Amazon 2.8.5
Oozie version:Oozie 5.1.0
EMR version : emr-5.26.0
Appreciate any guidance here.
Issue resolved after we used the older version of Oozie i.e., 4.3. No other changes made. Works fine. Had read in one of the AWS links that some people were not able to execute oozie with 5.X versions. Will update the answer once we get an concrete reply from AWS.

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at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
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at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
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... 19 more
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ENV SPRING_REDIS_SSL true
ENV SPRING_REDIS_PASSWORD blahblahblahblah
ENV SPRING_REDIS_JEDIS_POOL_MAX_ACTIVE 8
ENV SPRING_REDIS_JEDIS_POOL_MAX_IDLE 8
ENV SPRING_REDIS_JEDIS_POOL_MAX_WAIT -1ms
ENV SPRING_REDIS_JEDIS_POOL_MIN_IDLE 0
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at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:670)
at org.apache.tomcat.util.net.SocketWrapperBase.flushBlocking(SocketWrapperBase.java:607)
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at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.flush(Http11OutputBuffer.java:646)
at org.apache.coyote.http11.filters.ChunkedOutputFilter.flush(ChunkedOutputFilter.java:169)
at org.apache.coyote.http11.Http11OutputBuffer.flush(Http11OutputBuffer.java:252)
at org.apache.coyote.http11.Http11Processor.flush(Http11Processor.java:1564)
at org.apache.coyote.AbstractProcessor.action(AbstractProcessor.java:352)
at org.apache.coyote.Response.action(Response.java:173)
at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:317)
at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:284)
at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:118)
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:297)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:141)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229)
at org.springframework.util.StreamUtils.copy(StreamUtils.java:121)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:103)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:43)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:224)
at org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitterReturnValueHandler$HttpMessageConvertingHandler.sendInternal(ResponseBodyEmitterReturnValueHandler.java:199)
at org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitterReturnValueHandler$HttpMessageConvertingHandler.send(ResponseBodyEmitterReturnValueHandler.java:189)
at org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter.sendInternal(ResponseBodyEmitter.java:189)
at org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter.send(ResponseBodyEmitter.java:183)
at org.springframework.web.servlet.mvc.method.annotation.SseEmitter.send(SseEmitter.java:133)
at org.springframework.web.servlet.mvc.method.annotation.ReactiveTypeHandler$SseEmitterSubscriber.send(ReactiveTypeHandler.java:341)
at org.springframework.web.servlet.mvc.method.annotation.ReactiveTypeHandler$AbstractEmitterSubscriber.run(ReactiveTypeHandler.java:283)
at java.lang.Thread.run(Thread.java:748)
While creating EmitterProcesser set to autoCancel=false
private EmitterProcessor<ServerSentEvent<String>> emitter = EmitterProcessor.create(false);

spring boot feign client: why ssl error when it is a http call

spring-boot version: 1.5.21.RELEASE
both the service provider and the service caller are the same spring boot version.
What I want to know is that why it is an SSL error when it is calling a http serivce?
below is part of the stack trace:
Caused by: feign.RetryableException: Unrecognized SSL message, plaintext connection? executing PUT http://serivce-name/service/api
at feign.FeignException.errorExecuting(FeignException.java:67)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104)
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
at feign.hystrix.HystrixInvocationHandler$1.run(HystrixInvocationHandler.java:108)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
... 27 common frames omitted
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:710)
at sun.security.ssl.InputRecord.read(InputRecord.java:527)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1316)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1291)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
at feign.Client$Default.convertAndSend(Client.java:133)
at feign.Client$Default.execute(Client.java:73)
I had the same issue. I'm using eureka for discovery server and feign client to conect between services. My problem was in then services' eureka configuration.
The source service was configured to use only http protocol:
eureka:
instance:
secure-port-enabled: false
non-secure-port-enabled: true
The target service was configured to use https protocol:
eureka:
instance:
secure-port-enabled: true
non-secure-port-enabled: false
In this configuration, the source server was trying to conect to target server via http protocol, but the target was configured with https.
So, I changed the target configuration like the source and It worked!

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