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#2366 Update documentation in regards to Java Module System

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Jude Niroshan 2021-03-07 14:11:45 +01:00 committed by GitHub
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documentation/src/main/asciidoc/chapter-2-set-up.asciidoc
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@ -248,20 +248,8 @@ If a policy is given for a specific mapper via `@Mapper#unmappedTargetPolicy()`,
|`WARN` |`WARN`
|=== |===
=== Using MapStruct on Java 9 === Using MapStruct with the Java Module System
MapStruct can be used with Java 9 (JPMS), support for it is experimental. MapStruct can be used with Java 9 and higher versions.
A core theme of Java 9 is the modularization of the JDK. One effect of this is that a specific module needs to be enabled for a project in order to use the `javax.annotation.Generated` annotation. `@Generated` is added by MapStruct to generated mapper classes to tag them as generated code, stating the date of generation, the generator version etc. To allow usage of the `@Generated` annotation `java.annotation.processing.Generated` (part of the `java.compiler` module) can be enabled.
To allow usage of the `@Generated` annotation the module _java.xml.ws.annotation_ must be enabled. When using Maven, this can be done like this:
export MAVEN_OPTS="--add-modules java.xml.ws.annotation"
If the `@Generated` annotation is not available, MapStruct will detect this situation and not add it to generated mappers.
[NOTE]
=====
In Java 9 `java.annotation.processing.Generated` was added (part of the `java.compiler` module),
if this annotation is available then it will be used.
=====