ExchangeHelper should respect ExchangePattern.InOptionalOut
------------------------------------------------------------
Key: CAMEL-1384
URL: https://issues.apache.org/activemq/browse/CAMEL-1384
Project: Apache Camel
Issue Type: Bug
Components: camel-core
Affects Versions: 1.6.0
Environment: ActiveMQ/Camel
Reporter: Michael Chen
The utility method org.apache.camel.util.ExchangeHelper.copyResults() is use by
many core classes. However, this method does not properly support MEP
InOptionalOut.
Assuming in an InOptionalOut exchange, having no out message means just that --
no out message should be sent, then the following lines in this method
{code}//
Message out = source.getOut(false);
if (out != null) {
result.getOut(true).copyFrom(out);
} else {
// no results so lets copy the last input
{code}
should be changed to:
{code}//
Message out = source.getOut(false);
if (out != null) {
result.getOut(true).copyFrom(out);
} else if (result.getPattern() == ExchangePattern.InOptionalOut) {
result.setOut(null);
} else {
// no results so lets copy the last input
{code}
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