Pax-Testing camel routes in Karaf with CamelTestSupport on recent versions

[Dietrich Schulten]

Hi,

I want to test Camel routes in Karaf. I use Pax-Exam to run Karaf. 

For older Karaf and Camel versions, I found a blog article by J.B. Onofre which shows how one can use CamelTestSupport to do that.

I got it working on JDK 8 for an older combination of Camel, Karaf and PaxExam with numerous adjustments (see links below). But when I switch to the current versions (Camel 2.24.2, Karaf 4.2.7, Pax-Exam 4.13.1), the CamelTestSupport setup fails, complaining with ClassNotFoundException: org.apache.camel.util.jndi.CamelInitialContextFactory.

When I disable the CamelTestSupport.setUp() method by overriding it with an empty method, I can see that the camel-core feature is present:

assertTrue(featuresService.isInstalled(featuresService.getFeature("camel-core")));

I have also tried to import the org.apache.camel.util.jndi package into the probe bundle. The package gets exported by the camel-core bundle jar, at least its MANIFEST.MF says so.

    @ProbeBuilder

    public TestProbeBuilder probeConfiguration(TestProbeBuilder probe) {

        probe.setHeader(Constants.IMPORT_PACKAGE, "*,org.apache.camel.util.jndi");

        return probe;

    }

The import appears to work, at least I get no import error during test execution.

Why can the test bundle not find the CamelInitialContextFactory?

I have created a clone of J.B. Onofre's Github example which fixes the JDK 8 issues and another one with recent versions which demonstrates the problem.

Works: Karaf 2.4 with Camel 2.12.1 on JDK 8

Fails: Karaf 4.2.7 using Camel 2.24.2.

Here is my stack overflow question with all the details and other attempts I have made:

https://stackoverflow.com/questions/59075424/testing-camel-2-24-x-routes-in-karaf-4-2-7-with-cameltestsupport

Best,

Dietrich

[Jean-Baptiste Onofré]

Hi,

CamelTestSupport is for utest whereas pax-exam is more for itest.

You can take a look on some itest I did about Camel, for instance:

https://github.com/apache/karaf-decanter/pull/111/files#diff-f23addf50c34ea79c8df17bb2861d649

So, you should *NOT* use CamelTestSupport for itest (and keep it for utest), and directly use producerTemplate, etc for itest.

Regards

JB

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[Dietrich Schulten]

Hi,

thank you very much, I was already wondering if CamelTestSupport is still a good fit for Pax Karaf Tests. You gave a clear opinion here :)

I see you have built your test upon KarafTestSupport and I was already able to get that to work in my environment, so that looks most promising.

I'll try to update my clone of your older tutorial accordingly.

Best,

Dietrich

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[Jean-Baptiste Onofré]

Hi Dietrich

Just a small note: I did cleanups/improvements on KarafTestSupport in Karaf 4.2.8-SNAPSHOT. It's easier to use now. So I would advice to use KarafTestSupport from Karaf 4.2.8-SNAPSHOT (I'm preparing Karaf 4.2.8 anyway ;) ).

Regards
JB

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[Dietrich Schulten]

Exactly. Those spring and activemq versions were a bit painful indeed :)

Btw your old blog code is running again
https://github.com/dschulten/blog-camel-blueprint/tree/karaf4-paxexam4. Care for a PR to your blog sample after 4.2.8 is out?

Best,
Dietrich

[Jean-Baptiste Onofré]

Hi Dietrich,

Yeah, it's a pretty old blog post ;) I think it makes sense to add or
extend the Karaf examples.

I will do it.

Thanks,
Regards
JB