Author Archives: Johannes Lorenz

WebSockets with Grails

Last week I had an interesting discussion about how to relief a threaded application server’s burden. If clients regularly poll the application server with a certain time window, just to ask whether there are updated information available, every time a … Continue reading

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Java CSV-Parser Comparison on Github

There are quite a few Java CSV parsers available. If you are unsure which one to choose or you wonder how they perform, have a look at github. There is a project¬†to do performance testing of¬†various CSV parsers. If you … Continue reading

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Install the AVR Toolchain on OS X

Programming AVRs or Arduinos is easy and convenient with the Arduino IDE. On the one hand side, the high-level Arduino libraries hide a lot of complexity and you get your results probably faster, but on the other side the concept … Continue reading

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How to install Groovy on a Banana Pi or Raspberry Pi

The Raspberry or Banana Pi have already pre-installed Python. If you like to stay with Groovy on these nice little devices, here are the instructions to install Groovy. GVM makes the whole process very easy and convenient. Open a terminal … Continue reading

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Adaptive machine learning in a streaming environment

Here is a very nice explanation about adaptive machine learning in a streaming environment. Adaptive machine leaning

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How to Solve: “Too many connections”; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:

Hi, in one of my projects I used GPars and its withPool() method to execute some async tasks. The prime purpose of a task is to fetch some data from external sources and save the resulting data to a database. … Continue reading

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