[CAMEL-4858] xpath expression with $header with saxon may throw exception if header did not exist

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.3, 2.9.0
• Fix Version/s: 2.7.5, 2.8.4, 2.9.1
• Component/s: camel-core, camel-saxon
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Claus Ibsen
• Created: 04/Jan/12 07:15
• Updated: 04/Jan/12 08:26
• Resolved: 04/Jan/12 08:24

Description

See CAMEL-747

We should return an empty String instead of a Void.class, as this works with both JDK + Saxon XPathEngine.
Saxon does not work with the Void.class.