Welcome!

... to the digital home of Steven Schwenke.

This site is supposed to be a showcase for my thoughts about software engineering, less a personal homepage. If you want to know more about me, invite me to a beer.

 

“Could not open PerfMemory” / “Local Java applications cannot be monitored“

08 Jul 2015
Posted by Steven

Today I encountered a strance error opening both Java Mission Control and VisualVM: “Could not open PerfMemory” and “Local Java applications cannot be monitored”:

 

 

 

Free Java 8 course material

05 Jun 2015
Posted by Steven

Last week, I gave a Java 8 course for some colleagues. All the explanations, examples and code samples of that course are available at Github. Feel free to use this material for learning or giving a course of your own. Please give feedback if you find any errors or I forgot a topic. Here are the contents of the course:

Lessons Learned in May 2015

30 May 2015
Posted by Steven

The other day I listened to episode 17 of the Full Stack Radio, which was about conferences and how to get the most out of them. Apparently, a lot of speakers over-think their subject and talk about it on a meta-level. They talk about code instead of showing it.

Why continuous Delivery is important

21 May 2015
Posted by Steven

Some software development topics are controversial because they don't seem to have real benefit or the costs are too high. In my experience, one of those topics is using Continuous Delivery. This concept describes the full automation of the whole build process so a product can be built just by clicking a button. The source code is build, every artifact is created and even the database is updated completely automatic.

Definition of Done

16 Mar 2015
Posted by Steven

Some people call me pedantic because I seem to have a checklist for almost everything. I like that because it's true. :) Today, I want to share my Definition of Done (DoD). This is a list of questions I go through every time I finish coding a requirement, fixing a defect or doing another non-trivial task of software development. Every question has to be answered with a clear "Yes!" before I can consider the task done.

How to analyze dependencies of relational data with Jailer

03 Mar 2015
Posted by Steven

The other day, I tried to delete a couple of records from our database. Not a hard task you may think and I would agree with you. However, this database table had quite a few incoming foreign key constraints that made it impossible to delete records from it without deleting records in other tables first. Not knowing the relations between tables made it impossible to decide which record to delete in which order. In search for a solution I found Jailer.

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