Use eirslett/frontend-maven-plugin#1157

.gitignore

@@ -65,9 +65,7 @@ junit.xml
 
 # Yarn
 # https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored
-.pnp.*
 .yarn/*
-.yarnrc.yml
 !.yarn/patches
 !.yarn/plugins
 !.yarn/sdks
@@ -78,7 +76,4 @@ node/
 node_modules/
 
 # Generated JavaScript Bundles
-jsbundles
-
-# In case someone accidentally runs npm install instead of yarn install
-package-lock.json
+war/src/main/webapp/jsbundles/

.prettierignore

@@ -7,8 +7,6 @@ node/
 
 .git
 
-.yarnrc.yml
-
 # libraries / external deps / generated files
 war/src/main/js/plugin-setup-wizard/bootstrap-detached.js
 war/src/main/webapp/scripts/yui

.yarnrc.yml

@@ -0,0 +1,2 @@
+enableGlobalCache: false
+nodeLinker: node-modules

CONTRIBUTING.md

@@ -53,12 +53,12 @@ MAVEN_OPTS='--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/ja
 ### Running the Yarn frontend build
 
 > [!TIP]
-> If you already have Node.js installed, you do not need to change your path. Start using `yarn` by enabling [Corepack](https://yarnpkg.com/corepack) with `corepack enable`, if it isn't already; this will add the `yarn` binary to your PATH.
+> If you already have Node.js 20.x LTS installed, you do not need to change your path. Start using Yarn by enabling [Corepack](https://yarnpkg.com/corepack) with `corepack enable`, if it isn't already; this will add the `yarn` binary to your path.
 
 To run the Yarn frontend build, after [building the WAR file](#building-the-war-file), add the downloaded versions of Node and Yarn to your path:
 
 ```sh
-export PATH=$PWD/node:$PWD/node/yarn/dist/bin:$PATH
+export PATH=$PWD/node:$PWD/node/node_modules/corepack/shims:$PATH
 ```
 
 Then you can run Yarn with e.g.

pom.xml

@@ -99,11 +99,6 @@ THE SOFTWARE.
     <!-- Make sure to keep the jetty-ee9-maven-plugin version in war/pom.xml in sync with the Jetty release in Winstone: -->
     <winstone.version>8.1</winstone.version>
     <node.version>20.17.0</node.version>
-    <!-- frontend-maven-plugin will install this Yarn version as bootstrap, then hand over control to Yarn Berry. -->
-    <yarn.version>1.22.19</yarn.version>
-    <!-- maven-antrun-plugin will download this Yarn version. -->
-    <yarn-berry.version>4.5.0</yarn-berry.version>
-    <yarn-berry.sha256sum>cc00dce5de4f68d11450519a0f69eadf2a1cbe5cc0d8e740bfac817a31d76874</yarn-berry.sha256sum>
   </properties>
 
   <!--
@@ -430,66 +425,40 @@ THE SOFTWARE.
       </activation>
       <build>
         <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-antrun-plugin</artifactId>
-            <executions>
-              <execution>
-                <id>download-yarn</id>
-                <goals>
-                  <goal>run</goal>
-                </goals>
-                <phase>initialize</phase>
-                <configuration>
-                  <target>
-                    <property name="yarn.dest" value="${project.basedir}/.yarn/releases/yarn-${yarn-berry.version}.cjs" />
-                    <dirname file="${yarn.dest}" property="yarn.dest.dir" />
-                    <mkdir dir="${yarn.dest.dir}" />
-                    <get dest="${yarn.dest}" src="https://repo.yarnpkg.com/${yarn-berry.version}/packages/yarnpkg-cli/bin/yarn.js" usetimestamp="true" />
-                    <checksum algorithm="SHA-256" file="${yarn.dest}" property="${yarn-berry.sha256sum}" verifyProperty="yarn.checksum.matches" />
-                    <condition property="yarn.checksum.matches.fail">
-                      <equals arg1="${yarn.checksum.matches}" arg2="false" />
-                    </condition>
-                    <fail if="yarn.checksum.matches.fail">Checksum error</fail>
-                    <echo file="${project.basedir}/.yarnrc.yml">yarnPath: ${yarn.dest}</echo>
-                  </target>
-                </configuration>
-              </execution>
-            </executions>
-          </plugin>
           <plugin>
             <groupId>com.github.eirslett</groupId>
             <artifactId>frontend-maven-plugin</artifactId>
             <version>1.15.1</version>
             <executions>
               <execution>
-                <id>install node and yarn</id>
+                <id>install node and corepack</id>
                 <goals>
-                  <goal>install-node-and-yarn</goal>
+                  <goal>install-node-and-corepack</goal>
                 </goals>
                 <phase>initialize</phase>
                 <configuration>
                   <nodeVersion>v${node.version}</nodeVersion>
-                  <yarnVersion>v${yarn.version}</yarnVersion>
                   <nodeDownloadRoot>https://repo.jenkins-ci.org/nodejs-dist/</nodeDownloadRoot>
-                  <!-- tried to create a mirror for yarnDownloadRoot but it did not work -->
                 </configuration>
               </execution>
               <execution>
                 <id>yarn install</id>
                 <goals>
-                  <goal>yarn</goal>
+                  <goal>corepack</goal>
                 </goals>
                 <phase>initialize</phase>
+                <configuration>
+                  <arguments>yarn install</arguments>
+                </configuration>
               </execution>
               <execution>
                 <id>yarn build</id>
                 <goals>
-                  <goal>yarn</goal>
+                  <goal>corepack</goal>
                 </goals>
                 <phase>generate-sources</phase>
                 <configuration>
-                  <arguments>build</arguments>
+                  <arguments>yarn build</arguments>
                 </configuration>
               </execution>
             </executions>
@@ -517,11 +486,11 @@ THE SOFTWARE.
               <execution>
                 <id>yarn lint:ci</id>
                 <goals>
-                  <goal>yarn</goal>
+                  <goal>corepack</goal>
                 </goals>
                 <phase>test</phase>
                 <configuration>
-                  <arguments>lint:ci</arguments>
+                  <arguments>yarn lint:ci</arguments>
                   <skip>${yarn.lint.skip}</skip>
                 </configuration>
               </execution>
@@ -550,11 +519,11 @@ THE SOFTWARE.
               <execution>
                 <id>yarn lint</id>
                 <goals>
-                  <goal>yarn</goal>
+                  <goal>corepack</goal>
                 </goals>
                 <phase>test</phase>
                 <configuration>
-                  <arguments>lint</arguments>
+                  <arguments>yarn lint</arguments>
                   <skip>${yarn.lint.skip}</skip>
                 </configuration>
               </execution>