jm + openjdk   3

Do not fall into Oracle's Java 11 trap
The key part of the terms is as follows:

You may not: use the Programs for any data processing or any commercial, production, or internal business purposes other than developing, testing, prototyping, and demonstrating your Application;

The trap is as follows:

Download Oracle JDK (because that is what you've always done, and it is what the web-search tells you);
Use it in production (because you didn't realise the license changed);
Get a nasty phone call from Oracle's license enforcement teams demanding lots of money

In other words, Oracle can rely on inertia from Java developers to cause them to download the wrong (commercial) release of Java. Unless you read the text/warnings/legalese very carefully you might not even realise Oracle JDK is now commercial, and that you are therefore liable to pay Oracle for Java.

java  licensing  openjdk  open-source  oracle  software  jdk  jre 
22 days ago by jm
Proving that Android’s, Java’s and Python’s sorting algorithm is broken (and showing how to fix it)
Wow, this is excellent work. A formal verification of Tim Peters' TimSort failed, resulting in a bugfix:
While attempting to verify TimSort, we failed to establish its instance invariant. Analysing the reason, we discovered a bug in TimSort’s implementation leading to an ArrayOutOfBoundsException for certain inputs. We suggested a proper fix for the culprit method (without losing measurable performance) and we have formally proven that the fix actually is correct and that this bug no longer persists.
timsort  algorithms  android  java  python  sorting  formal-methods  proofs  openjdk 
february 2015 by jm
Interview with the Github Elasticsearch Team
good background on Github's Elasticsearch scaling efforts. Some rather horrific split-brain problems under load, and crashes due to OpenJDK bugs (sounds like OpenJDK *still* isn't ready for production). painful
elasticsearch  github  search  ops  scaling  split-brain  outages  openjdk  java  jdk  jvm 
september 2013 by jm

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