Camel doesn't compile with error like '[ERROR] CAP#1 extends ProcessorDefinition<CAP#1> from capture of ?)'

Solution Verified - Updated -

Environment

Red Hat JBoss Fuse

Issue

Camel routes in Java DSL will fail to compile sometimes. The error messages can be strange, like '[ERROR] CAP#1 extends ProcessorDefinition<CAP#1> from capture of ?)'.

Resolution

Java DSL is handy, but it can have limitations. Use of conditionals, ('when', 'choice', etc.) can contribute to code that won't compile. Refactor routes (perhaps using direct: subroutes) to simplify the amount of nesting and conditional logic.

Note this text from the Camel doc: "If there is still problems, then you can split your route into multiple routes, and link them together using the Direct component.
There can be some combinations of EIPs that can hit limits in how far we can take the fluent builder DSL with generics you can do in Java programming language (1.7 and below)."

[1] http://camel.apache.org/why-can-i-not-use-when-or-otherwise-in-a-java-camel-route.html

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