Automate Java version recommendation administrative monitor

core/src/main/java/jenkins/monitor/JavaVersionRecommendationAdminMonitor.java

@@ -24,13 +24,21 @@
 
 package jenkins.monitor;
 
+import edu.umd.cs.findbugs.annotations.NonNull;
 import hudson.Extension;
 import hudson.model.AdministrativeMonitor;
 import hudson.security.Permission;
 import java.io.IOException;
+import java.time.LocalDate;
+import java.time.Period;
+import java.time.ZoneId;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Locale;
+import java.util.NavigableMap;
+import java.util.TreeMap;
 import jenkins.model.Jenkins;
 import jenkins.util.SystemProperties;
-import jenkins.util.java.JavaUtils;
 import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.DoNotUse;
@@ -46,15 +54,68 @@
 @Symbol("javaVersionRecommendation")
 public class JavaVersionRecommendationAdminMonitor extends AdministrativeMonitor {
 
+    /**
+     * The list of supported Java long-term support (LTS) releases. The key is the {@link
+     * Runtime.Version#feature() feature-release counter}. The value is the date the Jenkins project
+     * drops support for that release, which must be before the date the Eclipse Temurin project
+     * drops support for that release. This list must remain synchronized with the one in {@code
+     * executable.Main}.
+     *
+     * <p>To add support for a Java version:
+     *
+     * <ul>
+     *   <li>Update {@link #SUPPORTED_JAVA_VERSIONS}
+     *   <li>Update {@code executable.Main#SUPPORTED_JAVA_VERSIONS}
+     *   <li>Update the {@code Jenkinsfile} for core and core components
+     *   <li>Update the {@code Jenkinsfile} for PCT
+     *   <li>Update the {@code Jenkinsfile} for ATH
+     *   <li>Update the archetype and the {@code Jenkinsfile} for critical plugins
+     * </ul>
+     *
+     * @see <a href="https://endoflife.date/eclipse-temurin">Eclipse Temurin End of Life</a>
+     */
+    private static final NavigableMap<Integer, LocalDate> SUPPORTED_JAVA_VERSIONS;
+
+    static {
+        NavigableMap<Integer, LocalDate> supportedVersions = new TreeMap<>();
+        supportedVersions.put(11, LocalDate.of(2024, 9, 30)); // Temurin: 10-31-2024
+        supportedVersions.put(17, LocalDate.of(2026, 3, 31)); // Temurin: 10-31-2027
+        supportedVersions.put(21, LocalDate.of(2027, 9, 30)); // Temurin: 09-31-2029
+        SUPPORTED_JAVA_VERSIONS = Collections.unmodifiableNavigableMap(supportedVersions);
+    }
+
     public JavaVersionRecommendationAdminMonitor() {
-        super(JavaVersionRecommendationAdminMonitor.class.getName() + "-3");
+        super(getId());
+    }
+
+    /**
+     * Compute the ID for the administrative monitor. The ID includes the Java version, EOL date,
+     * and severity so that changes to the EOL date for a given Java version will invalidate
+     * previous dismissals of the administrative monitor and so that users who decline to upgrade
+     * after the first warning get a second warning when they are closer to the deadline.
+     *
+     * @return The computed ID.
+     */
+    private static String getId() {
+        StringBuilder id = new StringBuilder();
+        id.append(JavaVersionRecommendationAdminMonitor.class.getName());
+        LocalDate endOfLife = getEndOfLife();
+        if (endOfLife.isBefore(LocalDate.MAX)) {
+            id.append('-');
+            id.append(Runtime.version().feature());
+            id.append('-');
+            id.append(endOfLife);
+            id.append('-');
+            id.append(getSeverity());
+        }
+        return id.toString();
     }
 
     private static Boolean disabled = SystemProperties.getBoolean(JavaVersionRecommendationAdminMonitor.class.getName() + ".disabled", false);
 
     @Override
     public boolean isActivated() {
-        return !disabled && JavaUtils.isRunningWithJava8OrBelow();
+        return !disabled && getDeprecationPeriod().getYears() < 2;
     }
 
     @Override
@@ -78,8 +139,55 @@ public HttpResponse doAct(@QueryParameter String no) throws IOException {
             disable(true);
             return HttpResponses.forwardToPreviousPage();
         } else {
-            return new HttpRedirect("https://www.jenkins.io/redirect/upgrading-jenkins-java-version-8-to-11");
+            return new HttpRedirect("https://jenkins.io/redirect/java-support/");
         }
     }
 
+    @NonNull
+    private static LocalDate getEndOfLife() {
+        LocalDate endOfLife = SUPPORTED_JAVA_VERSIONS.get(Runtime.version().feature());
+        return endOfLife != null ? endOfLife : LocalDate.MAX;
+    }
+
+    @NonNull
+    private static Period getDeprecationPeriod() {
+        return Period.between(LocalDate.now(), getEndOfLife());
+    }
+
+    @NonNull
+    private static Severity getSeverity() {
+        return getDeprecationPeriod().getYears() < 1 ? Severity.DANGER : Severity.WARNING;
+    }
+
+    /**
+     * @return The current feature-release counter.
+     * @see Runtime#version()
+     */
+    @Restricted(DoNotUse.class)
+    public int getJavaVersion() {
+        return Runtime.version().feature();
+    }
+
+    /**
+     * @return The end of life date for the current Java version in the system default time zone.
+     */
+    @Restricted(DoNotUse.class)
+    public Date getEndOfLifeAsDate() {
+        return Date.from(getEndOfLife().atStartOfDay(ZoneId.systemDefault()).toInstant());
+    }
+
+    /**
+     * @return The severity of the administrative monitor, used to set the background color of the alert.
+     */
+    @Restricted(DoNotUse.class)
+    public String getSeverityAsString() {
+        return getSeverity().toString().toLowerCase(Locale.US);
+    }
+
+    private enum Severity {
+        SUCCESS,
+        INFO,
+        WARNING,
+        DANGER
+    }
 }

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/description.jelly

@@ -1,4 +1,4 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:l="/lib/layout" xmlns:f="/lib/form" xmlns:i="jelly:fmt" xmlns:st="jelly:stapler">
-    ${%blurb}
+    ${%blurb(it.javaVersion)}
 </j:jelly>

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/description.properties

@@ -1 +1 @@
-blurb = Recommends Java 11 for running Jenkins if an older version is used.
+blurb = Recommends Java {0,number} for running Jenkins if an older version is used.

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/description_pt_BR.properties

@@ -20,4 +20,4 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-blurb=Recomenda o Java 11 para executar o Jenkins se uma versão anterior está em uso.
+blurb=Recomenda o Java {0,number} para executar o Jenkins se uma versão anterior está em uso.

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/description_ru.properties

@@ -1 +1 @@
-blurb = Рекомендует запускать Jenkins на Java 11, если используется более старая версия.
+blurb = Рекомендует запускать Jenkins на Java {0,number}, если используется более старая версия.

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/description_zh_TW.properties

@@ -1 +1 @@
-blurb=若您使用的 Java 版本低於 11，推薦您改用 Java 11 來執行 Jenkins。
+blurb=若您使用的 Java 版本低於 {0,number}，推薦您改用 Java {0,number} 來執行 Jenkins。

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/message.jelly

@@ -24,15 +24,14 @@ THE SOFTWARE.
 
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:l="/lib/layout" xmlns:f="/lib/form">
-    <j:invokeStatic var="currentRuntimeJavaVersion" className="jenkins.util.java.JavaUtils" method="getCurrentRuntimeJavaVersion" />
-    <div class="alert alert-danger">
+    <div class="alert alert-${it.severityAsString}">
         <form id="JavaVersionRecommendationAdminMonitor" method="post" action="${rootURL}/${it.url}/act" name="${it.id}">
             <f:submit name="yes" value="${%More Info}"/>
             <l:isAdmin>
                 <f:submit value="${%Ignore}" name="no"/>
             </l:isAdmin>
         </form>
-        <h2>${%Recommended_Java_Version_Heading(currentRuntimeJavaVersion)}</h2>
-        ${%Recommended_Java_Version(currentRuntimeJavaVersion)}
+        <h2>${%Recommended_Java_Version_Heading(it.javaVersion)}</h2>
+        ${%Recommended_Java_Version(it.javaVersion, it.endOfLifeAsDate)}
     </div>
 </j:jelly>

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/message.properties

@@ -1,5 +1,3 @@
-Recommended_Java_Version_Heading=Java {0} end of life in Jenkins
-Recommended_Java_Version=<p class="jenkins-!-margin-bottom-0">You are running Jenkins on Java {0}, support for which will end on or after <strong>June 21, 2022</strong>. \
-  This is earlier than a previously announced date.</p> \
-  <p class="jenkins-!-margin-top-0">The Long Term Support (LTS) line of Jenkins will continue support till September 2022.</p> \
-  <p>Please refer to <a href="https://www.jenkins.io/redirect/upgrading-jenkins-java-version-8-to-11" target="_blank" rel="noopener noreferrer">the documentation</a> for details on upgrading to Java 11.</p>
+Recommended_Java_Version_Heading=Java {0,number} end of life in Jenkins
+Recommended_Java_Version=You are running Jenkins on Java {0,number}, support for which will end on or after {1,date}. \
+  Refer to <a href="https://jenkins.io/redirect/java-support/" target="_blank" rel="noopener noreferrer">the documentation</a> for more details.

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/message_pt_BR.properties

@@ -22,10 +22,6 @@
 
 More\ Info=Mais informação
 Dismiss=Dispensar
-Recommended_Java_Version=<p class="jenkins-!-margin-bottom-0">Você está executando o Jenkins com o Java {0}, cujo \
-  suporte será encerrado em <strong>21 de junho de 2022</strong>. Isto é antes do que a data previamente anunciada.</p>\
-  <p class="jenkins-!-margin-top-0">A linha de suporte de longo período (LTS) do Jenkins continuará a suportar esta \
-  versão até setembro de 2022.</p><p>Por favor se refira a \
-  <a href="https://www.jenkins.io/redirect/upgrading-jenkins-java-version-8-to-11" target="_blank" rel="noopener noreferrer">\
-  a documentação</a> para maiores detalhes sobre atualizar para o Java versão 11.</p>
-Recommended_Java_Version_Heading=Fim de suporte ao Java {0} pelo Jenkins
+Recommended_Java_Version=Você está executando o Jenkins com o Java {0,number}, cujo suporte será encerrado em {1,date}. \
+  Se refira a <a href="https://jenkins.io/redirect/java-support/" target="_blank" rel="noopener noreferrer">a documentação</a> para maiores detalhes.
+Recommended_Java_Version_Heading=Fim de suporte ao Java {0,number} pelo Jenkins

core/src/main/resources/jenkins/monitor/JavaVersionRecommendationAdminMonitor/message_ru.properties

@@ -1,11 +1,5 @@
-Recommended_Java_Version_Heading=Конец поддержки Java {0} в Jenkins
-Recommended_Java_Version=<p class="jenkins-!-margin-bottom-0">Вы запустили Jenkins на Java {0}. Её поддержка будет \
-  остановлена <strong>21 июня 2022</strong>. \
-  Это раньше, чем дата, объявленная ранее.</p> \
-  <p class="jenkins-!-margin-top-0">Долгосрочно поддерживаемые (LTS) релизы Jenkins будут поддерживать её до сентября \
-  2022.</p> \
-  <p>Пожалуйста, смотрите детали об обновлении до Java 11 в \
-  <a href="https://www.jenkins.io/redirect/upgrading-jenkins-java-version-8-to-11" \
-  target="_blank" rel="noopener noreferrer">документации</a>.</p>
+Recommended_Java_Version_Heading=Конец поддержки Java {0,number} в Jenkins
+Recommended_Java_Version=Вы запустили Jenkins на Java {0,number}. Её поддержка будет остановлена {1,date}. \
+  Смотрите детали в <a href="https://jenkins.io/redirect/java-support/" target="_blank" rel="noopener noreferrer">документации</a>.
 More\ Info=Подробнее
 Dismiss=Убрать

war/src/main/java/executable/Main.java

@@ -72,6 +72,10 @@
  */
 public class Main {
 
+    /**
+     * This list must remain synchronized with the one in {@code
+     * JavaVersionRecommendationAdminMonitor}.
+     */
     private static final NavigableSet<Integer> SUPPORTED_JAVA_VERSIONS =
             new TreeSet<>(Arrays.asList(11, 17, 21));