[CAMEL-16681] LazyStartProducer can result in NullPointerException in a multithreaded context

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.10.0
• Fix Version/s: 3.7.5, 3.11.0
• Component/s: camel-core
• Estimated Complexity: Unknown
• Assignee: Unassigned
• Reporter: Samrat Dhillon
• Created: 02/Jun/21 11:45
• Updated: 02/Jun/21 13:54
• Resolved: 02/Jun/21 13:54

Description

Using LazyStartProducer with multicast or recipientList (along with parallelism) can result in Exceptions. Using camel-kafka producer results in NullPointerException

The below route will result in NPE if kafka producer is marked as lazy start

from("direct:a")
.multicast().parallelProcessing()
.to("direct:b", "direct:c", "direct:d");

from("direct:b")
.to("kafka:topic1?lazyStartProducer=true");

from("direct:c")
.to("kafka:topic2?lazyStartProducer=true");

from("direct:d")
.to("kafka:topic3?lazyStartProducer=true");