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https://issues.apache.org/jira/browse/CAMEL-18856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-18856.
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Resolution: Fixed
Thanks for reporting and the test case
> camel-main - Unable to declare java.util.List bean
> --------------------------------------------------
>
> Key: CAMEL-18856
> URL: https://issues.apache.org/jira/browse/CAMEL-18856
> Project: Camel
> Issue Type: Bug
> Components: camel-main
> Affects Versions: 3.18.1, 3.20.0
> Environment: jdk11
> Reporter: Christian Schubert-Huff
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 3.20.2, 3.21.0
>
>
> I have been unsuccessful in declaring a java.util.List bean. According to
> camel-main documentation, a List bean should be declared using numeric keys
> in square brackets:
> {noformat}
> camel.beans.myprojects[0] = Camel
> camel.beans.myprojects[1] = Kafka
> camel.beans.myprojects[2] = Quarkus
> {noformat}
> This does, however, not actually declare a java.util.List, but a
> java.util.LinkedHashMap, instead.
> Again, reproduction is easy:
> {code:java}
> @Test
> public void testBindBeansList() {
> Main main = new Main();
> main.configure().addRoutesBuilder(new MyRouteBuilder());
> // defining a list bean
> main.addProperty("camel.beans.myprojects[0]", "Camel");
> main.addProperty("camel.beans.myprojects[1]", "Kafka");
> main.addProperty("camel.beans.myprojects[2]", "Quarkus");
> main.start();
> CamelContext camelContext = main.getCamelContext();
> assertNotNull(camelContext);
> Object bean = camelContext.getRegistry().lookupByName("myprojects");
> assertNotNull(bean);
> assertInstanceOf(java.util.List.class, bean);
> java.util.List<?> list = (java.util.List<?>) bean;
> assertEquals(3, list.size());
> assertEquals("Camel", list.get(0));
> assertEquals("Kafka", list.get(1));
> assertEquals("Quarkus", list.get(2));
> main.stop();
> } {code}
> There is a workaround, which is to use java.util.List#of, which is also more
> concise, but only possible if using Java 9 or above:
> {noformat}
> camel.beans.myprojects = #class:java.util.List#of("Camel", "Kafka",
> "Quarkus"){noformat}
>
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