[CAMEL-16480] Simple expression behavior change after 3.4->3.7 migration

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.7.3, 3.8.0
• Fix Version/s: 3.7.4, 3.10.0
• Component/s: camel-core
• Estimated Complexity: Unknown
• Regression: Regression
• Assignee: Claus Ibsen
• Reporter: Hokutor
• Created: 09/Apr/21 14:26
• Updated: 15/Apr/21 07:22
• Resolved: 15/Apr/21 07:22

Description

I just upgraded from camel 3.4 to 3.8. I had a logger statement as follows in my application. I was printing exchange body as follows in a log statement

.log("API response received is ==> ${body}")

Prior to upgrade, the above log statement prints the exchange body perfectly by evaluating ${body} expression

However, after upgrade, it prints as following

API response received is ==> body

 

On further digging, just figured that if you happen to add a property with key "body", then it causes the above unexpected behavior. Attaching a screenshot which illustrates the problem with a simple camel route 

 

 This issue was also discussed on zulip - https://camel.zulipchat.com/#narrow/stream/257298-camel/topic/Upgrade.20from.203.2E4.20to.203.2E7.20.2F.2F.20Simple.20expression.20behavior