[jira] [Created] (CAMEL-18856) camel-main - Unable to declare java.util.List bean

["Christian Schubert-Huff (Jira)" <ji...@apache.org>]

Christian Schubert-Huff created CAMEL-18856:
-----------------------------------------------

             Summary: 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: 3.20.0, 3.18.1
         Environment: jdk11
            Reporter: Christian Schubert-Huff


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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