Revert "Require Java 21 in plugin pom (#1286)"

README.md

@@ -10,7 +10,6 @@ It provides a common build configuration for all Jenkins plugins.
 
 ## Requirements
 
-Since version 6.2105.v0879858b_48d2, the plugin parent POM requires Jenkins 2.516 or newer and JDK 21 or newer.  
 Since version 5.0, the plugin parent POM requires Jenkins 2.479 or newer and JDK 17 or newer.  
 Since version 4.52, the plugin parent POM requires Jenkins 2.361 or newer and JDK 11 or newer.  
 Since version 4.40, the plugin parent POM supports Java 17.  
@@ -36,7 +35,7 @@ Then override the needed properties, e.g.:
     Take a look the developer documentation for the baseline version to use
     https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/#currently-recommended-versions
     -->
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.361.4</jenkins.version>
   </properties>
 ```
 

pom.xml

@@ -61,7 +61,7 @@
     <project.build.outputEncoding>UTF-8</project.build.outputEncoding>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <maven.compiler.release>21</maven.compiler.release>
+    <maven.compiler.release>17</maven.compiler.release>
     <maven.compiler.testRelease>${maven.compiler.release}</maven.compiler.testRelease>
     <!-- Generate metadata for reflection on method parameters -->
     <maven.compiler.parameters>true</maven.compiler.parameters>
@@ -83,7 +83,7 @@
     <incrementals-plugin.version>1.13</incrementals-plugin.version>
     <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
     <jacoco-maven-plugin.version>0.8.14</jacoco-maven-plugin.version>
-    <jenkins.version>2.516</jenkins.version>
+    <jenkins.version>2.479</jenkins.version>
     <jenkins-bom.version>${jenkins.version}</jenkins-bom.version>
     <jenkins-test-harness.version>2544.v272f2b_d841b_2</jenkins-test-harness.version>
     <junit.version>6.0.1</junit.version>
@@ -1663,6 +1663,17 @@
         <yarn.lint.skip>true</yarn.lint.skip>
       </properties>
     </profile>
+    <profile>
+      <id>java-level-17</id>
+      <activation>
+        <file>
+          <exists>target/java-level/17</exists>
+        </file>
+      </activation>
+      <properties>
+        <maven.compiler.release>17</maven.compiler.release>
+      </properties>
+    </profile>
     <profile>
       <id>java-level-21</id>
       <activation>

src/it/ban-junit4-fail/pom.xml

@@ -12,7 +12,7 @@
     <version>1.0-SNAPSHOT</version>
     <packaging>hpi</packaging>
     <properties>
-        <jenkins.version>2.516.3</jenkins.version>
+        <jenkins.version>2.479.3</jenkins.version>
         <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
     </properties>
     <repositories>

src/it/ban-junit4-pass/pom.xml

@@ -12,7 +12,7 @@
     <version>1.0-SNAPSHOT</version>
     <packaging>hpi</packaging>
     <properties>
-        <jenkins.version>2.516.3</jenkins.version>
+        <jenkins.version>2.479.3</jenkins.version>
         <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
     </properties>
     <repositories>

src/it/benchmark/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <repositories>
     <repository>

src/it/beta-fail/pom.xml

@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>

src/it/beta-just-testing/pom.xml

@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>

src/it/beta-pass/pom.xml

@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>

src/it/cd-plugin/pom.xml

@@ -14,7 +14,7 @@
   <name>CD plugin</name>
   <description>CD description</description>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <changelist>999999-SNAPSHOT</changelist>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>

src/it/incrementals-and-plugin-bom/pom.xml

@@ -14,15 +14,15 @@
   <properties>
     <revision>1.0</revision>
     <changelist>-SNAPSHOT</changelist>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
   <dependencyManagement>
     <dependencies>
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
-        <artifactId>bom-2.516.x</artifactId>
-        <version>5857.vb_f3dd0731f44</version>
+        <artifactId>bom-2.479.x</artifactId>
+        <version>3559.vb_5b_81183b_d23</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

src/it/localizer/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>

src/it/override-jth-fail/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <dependencyManagement>
     <dependencies>

src/it/override-jth-pass/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <!-- Must differ from the current jth version defined via property -->
     <jenkins-test-harness.version>2384.va_d3a_58a_4b_df5</jenkins-test-harness.version>
   </properties>

src/it/sample-plugin/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
   <dependencies>

src/it/servlet-api/pom.xml

@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <dependencies>
     <dependency>