In the last part we looked at instrumenting some Quarkus and Python code to obtain traces, which we forwarded to Jaeger. Unfortunately, the two were not connected and thus we could not get the full picture. Let’s fix that. Each trace as well as each span has a unique ID…

In a microservices world, there is no easy way of attaching a debugger or profiler to one component to understand why it exposes a certain behaviour. Profiling one component may reveal that it is someone elses problem. I have worked in the past with OpenTracing, but as this is now…

In my previous toolbox article I talked about HttpToolkit and how awesome it is to see http requests in action. There is an older tool, which is probably the Swiss Army knife of network debugging tools (and yes, I am old enough to have contributed to its predecessor tcpdump), Wireshark. …

On x86-based CPUs it is quite normal to run Linux containers and also Kubernetes. With the new M1-CPU based Macs, there are still challenges. There are instructions on the Minikube homepage, which even mention M1-Macs, but did not work for me. The following is how I got going: First I…

[ This is the first article in an upcoming series of toolbox ones that showcase some of the tools I use in my development work ] Often enough I need to find out the details of HTTP requests to reverse-engineer some API or to understand error responses where my used…

In a project I am working on I need to get tokens from a single-signon (SSO) -server to be able to talk to another service. That token has a limited lifespan and needs to be refreshed from time to time. The setup here is relatively simple. And in theory My…

Back in the day, in 2008 to be more concrete, I needed to visualise data structures like DTDs or XML schemas. I created x2svg and put it on SourceForge. Fast forward to fall of 2021. I am looking into JsonSchema and Avro and need a way to visualise the long…

We are building a machinery for ephemeral environments (“Clowder”) and one of the details is that the environment will provide different resource names, than the ones we expect in application.properties. For example, we may have the following entry in application.properties mp.messaging.outgoing.egress.topic=ingress We thus request a topic name of ingress, but…

In the project I am working on, we have a need to sometimes delete several items at once. The UI would send a delete request, the backend has to process it and let the UI know the outcome. So far so simple. Now the tricky part begins — how do…