java-16 Questions
2
Solved
I couldn't find any material on Google saying about the use of Cloneable records.
I was thinking of something like this:
record Foo() implements Cloneable {
public Foo clone() {...}
}
Is it a goo...
Arin asked 30/4, 2021 at 13:15
4
Solved
I have a piece of code in a test that checks that a list of results contains certain properties, using Hamcrest 2.2:
assertThat(result.getUsers(), hasItem(
hasProperty("name", equalTo(us...
Sexed asked 7/4, 2021 at 8:45
8
Solved
Java 16 introduced Records, which help to reduce boilerplate code when writing classes that carry immutable data. When I try to use a Record as @ConfigurationProperties bean as follows I get the fo...
Verwoerd asked 18/3, 2021 at 18:14
4
Solved
JDK 16 now includes a toList() method directly on Stream instances. In previous Java versions, you always had to use the collect method and provide a Collector instance.
The new method is obviously...
Soul asked 30/1, 2021 at 15:44
12
Solved
Simply upgrading one of my projects from Java-15 to 16 (using the latest build here). On compiling the project which uses lombok such as:
<dependency>
<groupId>org.projectlombok</gr...
Uroscopy asked 20/12, 2020 at 13:23
3
Solved
We can always have multiple classes inside a .java file. Considering encapsulation and that each class consists of multiple lines of code it always made sense to have 1 class (don't talk about nest...
Minesweeper asked 21/3, 2021 at 16:11
3
Solved
I have a situation where I want record instances for a specific type to only be creatable using a factory method in a separate class within the same package. The reason for this is because before c...
Myron asked 19/11, 2020 at 1:11
2
Java reflection is becoming more and more restricted:
Up to Java 8 all operations are allowed
Starting from Java 9 to 15 you are still able to perform the operations, but you will receive a warnin...
Landahl asked 22/6, 2021 at 17:50
5
Solved
Is there any way to force an exhaustive check of all enum values when the switch branches call methods with void return type? It's quite ugly to hard-code a yield just to coax the compiler to deman...
Rainbolt asked 15/2, 2021 at 7:56
1
Solved
I want to use mapMulti instead of flatMap and refactored the following code:
// using flatMap (version 1) => returns Set<Item>
var items = users.stream()
.flatMap(u -> u.getItems().str...
Lukash asked 5/2, 2022 at 14:11
3
Solved
Has anyone had any success using JDK 16 (https://jdk.java.net/16/) early access build with IntelliJ?
I am able to use JDK 15 early access builds, but when I try JDK 16 I get an error message:
Error...
Kirkman asked 2/7, 2020 at 0:42
1
Solved
I was previously using this contrived code
record Foo(int bar[]) {}
which is making use of the C-style array-notation. And it compiled fine in Java 15.
Now, all of the sudden, with the official re...
Ecumenism asked 4/9, 2021 at 15:38
2
Solved
I have a regular Jenkins instance running with some multibranch pipelines. The instance runs on JDK 11, as higher versions are not really supported with Jenkins. That's alright.
What is not alright...
Cremate asked 24/8, 2021 at 15:14
2
Solved
When upgrading from Java 15 to Java 16, some of my unit tests began failing due to a null pointer exception. The issue was caused by a null value being passed to the Paths.get() api. What changed i...
2
Solved
We know that a non-static inner class can be accessed using the instance of the outer class, so a static method is less meaningful inside a non-static class. But from Java 16 static methods are all...
Ellswerth asked 25/7, 2021 at 18:2
1
Solved
I have tried multiple releases from here using :
sudo -i
cd /usr/lib/jvm
wget [release link here]
tar xzf [file name here]
export PATH=$PWD/[dir here]/bin:$PATH
java -version
But after java -vers...
Burundi asked 9/6, 2021 at 6:18
1
Solved
TL;DR
keytool from OpenJDK16 creates PKCS12 keystore files that cannot be read from Java 8, 9, 10 and 11. Is this a bug? How to create a PKCS12 keystore that works with Java 8?
Context
I build a Ma...
1
Solved
Java records are used to implement shallowly immutable data carrier types. If the constructor accepts mutable types then we should implement explicit defensive copying to enforce immutability. e.g....
Illnatured asked 19/5, 2021 at 13:18
3
Solved
I'm streaming objects of a class implementing an interface. I'd like to collect them as a list of elements of the interface, rather than the implementing class.
This seems impossible with Java 16.0...
Listlessness asked 13/5, 2021 at 9:58
1
Solved
In this post about serializable records it is stated that
Deserialization creates a new record object by invoking a record class’s canonical constructor, passing values deserialized from the strea...
Demmy asked 10/5, 2021 at 21:35
2
When we use classes in Java it's very simple to add JavaDoc/comment for each class field/method:
class Product {
//Product unique identifier
private int id;
}
If we migrate these classes to Java...
Kaylyn asked 3/5, 2021 at 19:55
1
Is there a way to get an annotation like ConstructorProperties that has @Target(CONSTRUCTOR) to annotate the generated constructor of a java 16 record? E.g.:
@ConstructorProperties({"id",...
Johnsen asked 19/4, 2021 at 20:2
3
Solved
Assuming I have a record like this (or any other record):
record X(int i, int j) {
X(int i) {
this(i, 0);
}
X() {
this(0, 0);
}
X(String i, String j) {
this(Integer.parseInt(i), Integer.par...
Katar asked 16/4, 2021 at 13:25
1
Solved
Looking to see how to use Records with reflection under Java 16 (and 15 same behavior)
public record RecordTest2(int id, int something, double total, LocalDateTime createdOn) {
public RecordTest2...
Aby asked 10/4, 2021 at 18:47
1
Solved
I have cglib as a transitive dependency in a Maven project. Despite adding what I believe to be the correct --add-opens I can't get the library to work with Java 16.
How do I get cglib to work with...
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