odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/rest/ODataExceptionWrapper.java [154:178]:
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  private void enhanceContextWithMessageException(final ODataMessageException toHandleException) {
    errorContext.setErrorCode(toHandleException.getErrorCode());
    MessageReference messageReference = toHandleException.getMessageReference();
    Message localizedMessage = messageReference == null ? null : extractEntity(messageReference);
    if (localizedMessage != null) {
      errorContext.setMessage(localizedMessage.getText());
      errorContext.setLocale(localizedMessage.getLocale());
    }
    if (toHandleException instanceof ODataHttpException) {
      errorContext.setHttpStatus(((ODataHttpException) toHandleException).getHttpStatus());
    } else if (toHandleException instanceof EntityProviderException) {
      if(toHandleException instanceof EntityProviderProducerException){
        /*
         * As per OLINGO-763 serializer exceptions are produced by the server and must therefore result 
         * in a 500 internal server error
         */
        errorContext.setHttpStatus(HttpStatusCodes.INTERNAL_SERVER_ERROR);
      }else{
        errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
      }
    } else if (toHandleException instanceof BatchException) {
      errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
    }

  }
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/servlet/ODataExceptionWrapper.java [145:169]:
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  private void enhanceContextWithMessageException(final ODataMessageException toHandleException) {
    errorContext.setErrorCode(toHandleException.getErrorCode());
    MessageReference messageReference = toHandleException.getMessageReference();
    Message localizedMessage = messageReference == null ? null : extractEntity(messageReference);
    if (localizedMessage != null) {
      errorContext.setMessage(localizedMessage.getText());
      errorContext.setLocale(localizedMessage.getLocale());
    }
    if (toHandleException instanceof ODataHttpException) {
      errorContext.setHttpStatus(((ODataHttpException) toHandleException).getHttpStatus());
    } else if (toHandleException instanceof EntityProviderException) {
      if(toHandleException instanceof EntityProviderProducerException){
        /*
         * As per OLINGO-763 serializer exceptions are produced by the server and must therefore result 
         * in a 500 internal server error
         */
        errorContext.setHttpStatus(HttpStatusCodes.INTERNAL_SERVER_ERROR);
      }else{
        errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
      }
    } else if (toHandleException instanceof BatchException) {
      errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
    }

  }
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