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https://issues.apache.org/jira/browse/CAMEL-16878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17402077#comment-17402077
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Claus Ibsen commented on CAMEL-16878:
-------------------------------------
What version of Camel are you using?
> using breadcrumbs can cause ClassCastException in MailBinding
> -------------------------------------------------------------
>
> Key: CAMEL-16878
> URL: https://issues.apache.org/jira/browse/CAMEL-16878
> Project: Camel
> Issue Type: Bug
> Components: camel-mail
> Reporter: Rik van Ballegooijen
> Priority: Major
>
> ClassCastException: class
> org.apache.camel.component.directvm.DirectVmEndpoint cannot be cast to class
> org.apache.camel.component.mail.MailEndpoint
>
> This is caused by:
>
> {code:java}
> MailConfiguration mailConfiguration = ((MailEndpoint)
> exchange.getFromEndpoint()).getConfiguration();{code}
> Which assumes the exchanges endpoint is always a MailEndpoint.
>
> This piece of code from DefaultUnitOfWork will trigger the init of headers:
> {code:java}
> if (useBreadcrumb) {
> // create or use existing breadcrumb
> String breadcrumbId = exchange.getIn().getHeader(Exchange.BREADCRUMB_ID,
> String.class);
> if (breadcrumbId == null) {
> // no existing breadcrumb, so create a new one based on the exchange
> id
> breadcrumbId = exchange.getExchangeId();
> exchange.getIn().setHeader(Exchange.BREADCRUMB_ID, breadcrumbId);
> }
> }
> {code}
> If message is of type MailMessage, it will be delegated there:
> {code:java}
> MailBinding binding = ExchangeHelper.getBinding(getExchange(),
> MailBinding.class);
> if (binding != null) {
> map.putAll(binding.extractHeadersFromMail(mailMessage, getExchange()));
> }
> {code}
> This works for the initial route with a from imaps, but in a subroute the
> error occurs.
>
> Possible solution could be to pass a reference to either the mail endpoint or
> mail configuration to the binding on create/set.
>
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