PH68322: SENDING MULTIPART/FORM-DATA WITH MPRESTCLIENT ASYNCHRONOUS @REST

APAR status

• Closed as program error.

Error description

• Sending multipart/form-data with mpRestClient asynchronous
  @restclient (injected in CDI RequestScoped bean) results in
  exception. The same Request works synchronous as expected.The
  problem that is being experienced is because the wrong
  MessageBodyWriter is being selected to process the async
  request.
  
  [INFO] [err] jakarta.ws.rs.WebApplicationException: Failure in
  downstream service
  [INFO] [err] at ITClass.postMethod(OcrIT.java:104)
  [INFO] [err] at
  ITClass$Proxy$_$$WeldSubclass.postMethod$$super(Unknown Source)
  [INFO] [err] at java.base/jdk.internal.reflect.DirectMethodHand
  leAccessor.invoke(DirectMethodHandleAccessor.java:103)
  [INFO] [err] at
  java.base/java.lang.reflect.Method.invoke(Method.java:580)
  [INFO] [err] at org.jboss.weld.interceptor.proxy.TerminalAround
  InvokeInvocationContext.proceedInternal(TerminalAroundInvokeInv
  ocationContext.java:51)
  [INFO] [err] at org.jboss.weld.interceptor.proxy.AroundInvokeIn
  vocationContext.proceed(AroundInvokeInvocationContext.java:78)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty Core using Microprofile      *
  *                  Rest Client with asynchronous multipart     *
  *                  processing                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: The problem results from the            *
  *                      incorrect MessageBodyWriter being       *
  *                      selected in asynchronous                *
  *                      scenario.The following exception        *
  *                      confirms this:                          *
  *                      jakarta.ws.rs.WebApplicationException:  *
  *                      Unexpected entity instance:             *
  *                      org.jboss.resteasy.plugins.providers.mu *
  *                      ltipart.ResteasyEntityPartBuilder$Entit *
  *                      yPartImpl                               *
  *                      SystemErrR at                           *
  *                      org.jboss.resteasy.plugins.providers.mu *
  *                      ltipart.IBMMultipartListProvider.writeT *
  *                      o(IBMMultipartListProvider.java:150)    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This problem results from the wrong MessageBodyWriter being
  selected for Restful Web Services asynchronous multipart
  processing.  When this occurs an exception similar to the
  following may be in the logs:
  Caused by: jakarta.ws.rs.WebApplicationException: Unexpected
  entity instance:
  org.jboss.resteasy.plugins.providers.multipart.ResteasyEntityPar
  tBuilder$EntityPartImpl
  [20.02.25, 16:21:19:678 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.plugins.providers.multipart.IBMMultipartListP
  rovider.writeTo(IBMMultipartListProvider.java:150)
  [20.02.25, 16:21:19:678 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.plugins.providers.multipart.IBMMultipartListP
  rovider.writeTo(IBMMultipartListProvider.java:49)
  [20.02.25, 16:21:19:678 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterce
  ptorContext.writeTo(AbstractWriterInterceptorContext.java:284)
  [20.02.25, 16:21:19:679 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterce
  ptorContext.syncProceed(AbstractWriterInterceptorContext.java:24
  5)
  [20.02.25, 16:21:19:679 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterce
  ptorContext.proceed(AbstractWriterInterceptorContext.java:224)
  [20.02.25, 16:21:19:679 MEZ] 0000005d SystemErr
  R 	at
  org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.writeR
  equestBody(ClientInvocation.java:435)
  

Problem conclusion

• Restful Web Services multipart processing requires
  GenericEntity objects.  The Open Liberty code for multipart
  asynchronous processing was not properly casting the Entity a
  GenericEntity in this scenario.  This caused the wrong
  MessageBodyWriter to be selected.   The code was fixed to
  address this issue.The fix for this APAR is targeted
  for inclusion in 25.0.0.11
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WAS LIBERTY COR

• Fixed component ID

  5725L2900

Applicable component levels