JUnit 5 assert log entries in a SpringBoot application

Posted by on March 20, 2024 No comments

Asserting log entries in JUnit Jupiter is not as straight forward as one might want, but after some digging I found a way that worked for me. It should also me said that doing this i Jupiter is far easier than in previous versions of JUnit

The trick here is to use the SpringBoot OutputCaptureExtension on you test class. This can be accomplished with the @ExtendWith annotation in SpringBoot. This will inject a CapturedOutput object with output from our application

Example test class:

...    
import org.springframework.boot.test.system.CapturedOutput;
import org.springframework.boot.test.system.OutputCaptureExtension;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;

@Test
@ExtendWith(OutputCaptureExtension.class)
public void testHappyCaseSendDataToSystem(CapturedOutput output) throws Exception {

  MockEndpoint mock = camelContext.getEndpoint("mock:senddataToSystem", MockEndpoint.class);

  // Setting expectations
  mock.expectedMessageCount(1);

  // Invoking consumer
  producerTemplate.sendBody("direct:start", null);

  // Asserting mock is satisfied
  mock.assertIsSatisfied();

  // Assert log message
  assertThat(output.getOut(), containsString("LogMessage=Completed"));
}

Tested on SpringBoot v3.2.0 and JUnit 5.10.1

Camel-K: Add multiple custom classes via .jar

Posted by on February 5, 2024 No comments

I came across a use case where we needed a MapForce mapping in our Camel-K flow. MapForce generated Java code consists of many classes and it becomes overly cumbersome to add them all to the kamel run command. To solve this problem we put all the MapForce generated code into a .jar file and then added it to our cluster and referenced it in our kamel run command

1. First we made a .jar file out of the generated java code. For this we use the jar command that can be found in most java developer kits

jar cvf MapFormatAToFormatB.jar com/ se/

This creates a .jar file called MapFormatAToFormatB.jar with the contents of the generated code com/ and se/. Mapforce puts general classes into com/ package and our custom classes into your own packages, in our case se/.

2. Create a ConfigMap to hold our .jar so that Camel-K-Operator can use it

kubectl create configmap map-formata-to-formatb --from-file=MapFormatAToFormatB.jar

3. Reference the configmap in you kamel run command and add a trait to put it on the classpath

kamel run src/main/java/myApp --resource configmap:map-formata-to-formatb -t jvm.classpath=/etc/camel/resources/map-formata-to-formatb/MapFormatAToFormatB.jar

That´s it. In our code we reference these classes the same way we should have if the where part of our code base

import com.altova.io.Input;
import com.altova.io.StringInput;
import com.altova.io.StringOutput;
import se.myorg.integration.MapFormatAToFormatB;

import org.apache.camel.builder.RouteBuilder;

public class AmbuReg extends RouteBuilder {
    @Override
    public void configure() throws Exception {
       ...
    }
}

Tested on Camel-K-Operator v1.11.1 and Kubernetes v1.24.11

My kubectl CheatSheet

Posted by on August 10, 2023 No comments

Pods
List pods in current namespace

kubectl get pods

List pods i all namespaces

kubectl get pods -A

View details about a pod

kubectl describe pod <pod-name>

ConfigMaps
List ConfigMaps

kubectl get configmaps

View details about a ConfigMap

kubectl describe configmap <config-map-name>

Create a ConfigMap the holds a file

kubectl create configmap <config-map-name> --from-file=<file-name>

Deployments
List Deployments

kubectl get deployments

View details about a Deployment

kubectl describe deployment <deployment-name>

Services
List Services

kubectl get services

View details about a Service

kubectl describe service <service-name>

ServiceAccounts
List ServiceAccounts

kubectl get serviceaccounts

View details about a ServiceAccount

kubectl describe serviceaccount <service-account-name>

Secrets
List all secrets

kubectl get secrets

View details about a secret

kubectl describe secret <secret-name>

Get secret contents as JSON

kubectl get secret <secret-name> -o jsonpath='{.data}'

Create a secret with passwords

kubectl create secret generic <secret-name> --from-literal=username=<username> --from-literal=password='<password>'

Create a secret with files

kubectl create secret generic <secret-name> --from-file=truststore.jks --from-file=keystore.p12

Edit a secret

kubectl edit secrets <secret-name>

Delete a secret

kubectl delete secret <secret-name>

Logs
Setup “tail” on a pod. Here we want to see the last 500 lines of the log and setup a “tail” for new logs to the console

kubectl -n <namespace> logs -f --tail=500 --timestamps <exact-pod-name>

IntegrationPlattform
Get all objects of kind IntegrationPlattform

kubectl get IntegrationPlatform

View settings of the IntegrationPlattform

kubectl describe IntegrationPlatform <integration-plattform-name>