jdk14

问题 There is a message Project has been compiled by a more recent version of the Java Runtime (class file version 57.0), this version of the Java Runtime only recognizes class file versions up to 52.0 I googled "JRE required for JDK 14" and there is no download to be found. In my Java control panel on Windows 10, it says I have the latest version of the Java platform. I cannot downgrade the JDK on my project since I am using a library which was completely compiled on Java 14. How (and where) does

问题 I have some really noob question. I tried to create installation for my test app with jpackage in OpenJDK 14. Here is what I did: first, created custom JRE with jlink --module-path "C:\Java\javafx-sdk-14\lib" --add-modules javafx.controls,javafx.fxml --output hello\myjre and that was successful. I copied arguments from my Eclipse from Run Configurations. After that made installation with jpackage jpackage --name HelloFX --input hello --main-jar HelloFX.jar --runtime-image hello\myjre That

问题 Java 14 has many new features. One of them is showing detailed message in NullPointerException. I installed Java 14 and trying to compile and run below class but I am not getting any detailed message. Am I missing anything? please help. ~/code/demo/temp$ java -version openjdk version "14" 2020-03-17 OpenJDK Runtime Environment AdoptOpenJDK (build 14+36) Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.19.0, JRE 14 Mac OS X amd64-64-Bit Compressed References 20200313_47 (JIT enabled, AOT enabled

问题 Java 14 has many new features. One of them is showing detailed message in NullPointerException. I installed Java 14 and trying to compile and run below class but I am not getting any detailed message. Am I missing anything? please help. ~/code/demo/temp$ java -version openjdk version "14" 2020-03-17 OpenJDK Runtime Environment AdoptOpenJDK (build 14+36) Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.19.0, JRE 14 Mac OS X amd64-64-Bit Compressed References 20200313_47 (JIT enabled, AOT enabled

问题 Why is Java JPackage installing Windows dll files in two places ? My Jlink cmd is: "C:\Program Files\AdoptOpenJDK\jdk-14.0.0.36-hotspot\bin\jlink" --module-path="C:\Program Files\AdoptOpenJDK\jdk-14.0.0.36-hotspot\jmods" --add-modules java.desktop,java.datatransfer,java.logging,java.management,java.naming,java.net.http,java.prefs,java.scripting,java.sql,jdk.management,jdk.unsupported,jdk.scripting.nashorn,jdk.jcmd --output C:\code\jthink\jaikoz\windowsjre\JVM64 and my build command is "C:

问题 I have been working with the following class named City @ToString @AllArgsConstructor public class City { Integer id; String name; } and tried to convert it to a record called CityRecord as record CityRecord(Integer id, String name) {} // much cleaner! But moving to such a representation, one of our unit tests starts failing. The tests internally deal with a list of cities read from a JSON file and mapped to an object further counting the cities while grouping them under into a Map .