Blog: java specialists

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Issue 306 - Measuring compact strings memory savings JEP 254 replaced the char[] in our Strings with byte[]. How much memory does this save in our Strings? In this newsletter we show how we can... 4 30-01-2023 14:35:30 java specialists Beginners

Issue 305 - Contributing BigInteger.parallelMultiply() to OpenJDK BigInteger has clever algorithms for multiplying large numbers. Unfortunately multiply() is single-threaded. Until now. In this newsletter I... 11 30-11-2022 16:53:33 java specialists Beginners

Issue 304 - ObjectInputFilter JEP 290 introduced the ObjectInputFilter, which we can use to filter objects returned from an ObjectInputStream. We examine three ways of ma... 7 01-11-2022 00:28:11 java specialists Beginners

Issue 303 - Null Keys and Values in Maps Some Map implementations allow null keys and values. This leads to funky behaviour when calling putIfAbsent() and the compute functions. In ... 9 30-08-2022 15:31:24 java specialists Beginners

Issue 302 - Virtual Thread Deadlocks Virtual threads can deadlock, just like platform threads. Depending on what state they are in, this might be quite challenging to analyze. I... 16 30-06-2022 19:08:17 java specialists Beginners

Issue 301 - Gazillion Virtual Threads As from this month, Project Loom is part of the mainstream OpenJDK as a preview feature. Expect fantastical results, as bloggers around the ... 15 24-05-2022 08:36:46 java specialists Beginners

Issue 300 - Break in Switch With Pattern Matching The enhanced switch is cool. Pattern Matching for switch is super cool (they even timed the JEP number to be exactly 420 - or was that fate?... 14 26-04-2022 21:24:37 java specialists Beginners

Issue 299 - Synchronizing on Value-Based Classes Locking on Integer objects has always been a bad idea. And we now have a way to find such bad code with a runtime switch DiagnoseSyncOnValue... 11 31-03-2022 17:18:05 java specialists Beginners

Issue 298 - Finding Permitted Subclasses Sealed classes show us which subclasses they permitted. Unfortunately there is no way to do this recursively. In this newsletter we show how... 6 28-02-2022 21:18:44 java specialists Beginners

Issue 297 - Measuring ForkJoinPool Parallelism Java has support for parallelism baked into the JDK. We have parallel streams, parallel sort and CompletableFutures, all using the same comm... 15 31-01-2022 17:53:45 java specialists Beginners

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