What are the bad features of Java

Overview When you first learn to develop you see overly broad statements about different features to be bad, for design,…

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Inconsistent operation widen rules in Java

Overview When you perform a unary or binary operation in Java the standard behaviour is to use the widest operand…

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Java 8 Optional is not just for replacing a null value

Overview In Java 8, you can return an Optional instead of return null; as you might do in Java 7.…

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Mixing memory unit messages

One of my pet hates is developers messing up units of memory.  In general, the difference doesn’t matter much, or…

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Java Lambdas and Low Latency

Overview The main question around the use of Lambdas in Java and Low Latency is; Does they produce garbage and…

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How and Why is Unsafe used in Java?

Overview sun.misc.Unsafe has been in Java from at least as far back as Java 1.4 (2004). In Java 9, Unsafe will…

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On heap vs off heap memory usage

Overview I was recently asked about the benefits and wisdom of using off heap memory in Java. The answers may be…

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Chronicle Map and Yahoo Cloud Service Benchmark

Overview Yahoo Cloud Service Benchmark is a reasonably widely used benchmarking tool for testing key value stores for a significant…

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A Java conversion puzzler, not suitable for work (or interviews)

A really hard interview question would be something like this:                   int…

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