[CAMEL-16000] Type converter regression in Camel 3.7.0

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.7.0
• Fix Version/s: 3.7.1, 3.8.0
• Component/s: came-core
• Estimated Complexity: Unknown
• Regression: Regression
• Assignee: Unassigned
• Reporter: Antoine DESSAIGNE
• Created: 05/Jan/21 14:26
• Updated: 07/Jan/21 12:26
• Resolved: 07/Jan/21 12:25

Description

Hello,

When trying to update from 3.6.0 to 3.7.0 we noticed a regression in the type converter system.

The following route no longer works

from("timer:foo?repeatCount=1").
setBody(constant(Map.of("a", "A", "b", "B"))).
convertBodyTo(Collection.class).
split(body()).log("${body}");

In 3.6.0 it finds the converter org.apache.camel.converter.CollectionConverter#toSet(java.util.Map<K,V>) but now in 3.7.0 it throws the following exception

Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: java.util.ImmutableCollections.MapN to the required type: java.util.Collection with value {a=A, b=B}
	at org.apache.camel.impl.converter.CoreTypeConverterRegistry.mandatoryConvertTo(CoreTypeConverterRegistry.java:275)
	at org.apache.camel.support.MessageSupport.getMandatoryBody(MessageSupport.java:115)
	... 11 more

Can you have a look? Thank you very much