Analysis First some random facts: if not given a class loader, JAXBContext::newInstance will use the thread’s context class loader when looking for the JAXB implementation – this is the case even if you call newInstance(Class…) (one might mistakenly think it uses the provided class instances’ loader) Tomcat builds a small class loader hierarchy to separate … Read more
After researching JEP: 312 Thread-Local-Handshakes and reading the excellent comments to this question, here is a quick summary. It is a performance enhancement which cannot be used directly by developers: A handshake mechanism is proposed as an optimisation of the Hotspot safepoints mechanism. The former allows threads in a safepoint to continue executing immediately after … Read more
After some research I believe we can rule this out as a Junit or hamcrest issue. Indeed, this seems to be a JDK bug. The following code will not compile in JDK > 8: AnyOf<Iterable<? super String>> matcher = CoreMatchers.anyOf( CoreMatchers.hasItem(“d”), CoreMatchers.hasItem(“e”), CoreMatchers.hasItem(“f”)); Error:(23, 63) java: incompatible types: inference variable T has incompatible bounds equality … Read more
From the official Oracle manual. Navigate to /Library/Java/JavaVirtualMachines and remove the directory whose name matches the following format: /Library/Java/JavaVirtualMachines/jdkmajor.minor.macro[_update].jdk For example, to uninstall 8u6: %rm -rf jdk1.8.0_06.jdk Do not attempt to uninstall Java by removing the Java tools from /usr/bin. This directory is part of the system software and any changes will be reset by … Read more
var asks the compiler to infer the type of the variable from the type of the initializer, and the natural type of 42 is int. So number will be an int. That is what the JLS example says: var a = 1; // a has type ‘int’ And I would be surprised if it worked … Read more
Yes, var and the diamond operator can be combined together. The compiler will infer the most specific generic type: var list = new ArrayList<>(); // Infers ArrayList<Object> var list = new ArrayList<>(List.of(1, 2, 3)); // Infers ArrayList<Integer> And you can even combine them with an anonymous class: var list = new ArrayList<>() {};
There is no val in Java 10, as stated in JEP 286: Local-Variable Type Inference: Syntax Choices There was a diversity of opinions on syntax. The two main degrees of freedom here are what keywords to use (var, auto, etc), and whether to have a separate new form for immutable locals (val, let). We considered … Read more
One thing I notice is that your application (assuming that it’s packaged in tech.flexpoint.dashman) does not seem to be opened up to Spring in any way, which will surely result in failed class loading/illegal access. I would expect to see something like this in module-info.java (depending on your Spring dependencies): opens tech.flexpoint.dashman to spring.core, spring.beans, … Read more
I don’t say it’s a nice solution, but it seems to be a way through. Map<Long, String> dayOfWeekTexts = Map.of(1L, “Mo”, 2L, “Di”, 3L, “Mi”, 4L, “Do”, 5L, “Fr”, 6L, “Sa”, 7L, “So”); Map<Long, String> monthTexts = Map.ofEntries(Map.entry(1L, “Jan”), Map.entry(2L, “Feb”), Map.entry(3L, “Mär”), Map.entry(4L, “Apr”), Map.entry(5L, “Mai”), Map.entry(6L, “Jun”), Map.entry(7L, “Jul”), Map.entry(8L, “Aug”), Map.entry(9L, “Sep”), … Read more
jaxb-ri runtime uses ClassLoader#defineClass / Unsafe#defineClass to do some bytecode modification in runtime to optimize performance. ClassLoader#defineClass is tried first which causes the warning. This legacy optimization is removed completely in jaxb-ri master (after 2.3.0, not released yet). To disable this optimization for 2.3.0, set system property com.sun.xml.bind.v2.bytecode.ClassTailor.noOptimize. After next jaxb-ri release updating to newest … Read more