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https://github.com/khmarbaise/jdk21

JDK 21 Test repo
https://github.com/khmarbaise/jdk21

apache-maven jdk jdk21 maven

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JDK 21 Test repo

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:quality-heads-up: https://inside.java/2023/07/29/quality-heads-up/

:mockito-site: https://github.com/mockito/mockito

= JDK 21 Features



Just a try. It's related to this blog post:



* https://blog.soebes.io/posts/2023/06/2023-06-24-how-to-use-jdk21-preview-features-incubator/



== State



It's just a Proof Of Concept



== Requirements



JDK21+



== POM Details



=== Compiler Configuration



Some detailed hints about the configuration in the `pom.xml` for the compiler etc.



If you missed the configuration `-proc:full` as part of the `maven-compiler-plugin`

configuration for JDK21+ you will get the following output during the compilation of the

production code (`src/main/java`) and your test code (`src/test/java`):

[source,text]

----

Annotation processing is enabled because one or more processors were found

on the class path. A future release of javac may disable annotation processing

unless at least one processor is specified by name (-processor), or a search

path is specified (--processor-path, --processor-module-path), or annotation

processing is enabled explicitly (-proc:only, -proc:full).

Use -Xlint:-options to suppress this message.

Use -proc:none to disable annotation processing.

----

That requires the setup of the arg configuration element for the `maven-compiler-plugin`.

More details can be found in this {quality-heads-up}[article].



=== Dynamic Agents



In case you will see the following WARNING while using {mockito-site}[mockito] or alike:

[source]

----

OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended

WARNING: A Java agent has been loaded dynamically (/Users/khm/.m2/repository/net/bytebuddy/byte-buddy-agent/1.14.5/byte-buddy-agent-1.14.5.jar)

WARNING: If a serviceability tool is in use, please run with -XX:+EnableDynamicAgentLoading to hide this warning

WARNING: If a serviceability tool is not in use, please run with -Djdk.instrument.traceUsage for more information

WARNING: Dynamic loading of agents will be disallowed by default in a future release

----

this means you are running on at least JDK21+ which means you have to enhance your configuration for

`maven-surefire-plugin` and for `maven-failsafe-plugin` with the following:

[source,xml]

----

-XX:+EnableDynamicAgentLoading

----

That means in the end you have to have the following configuration for your plugins like this:

[source,xml]

----



  maven-surefire-plugin

  

    

    -XX:+EnableDynamicAgentLoading

  



  maven-failsafe-plugin

  

    

    -XX:+EnableDynamicAgentLoading

  



----



FJDK21