Deprecate java.level

README.md

@@ -13,7 +13,6 @@ The main changes are:
 * Reduced number of overridable properties. All references (e.g. dependencies and plugin versions) not
 thought to be overridden are no longer based on properties. The main remaining overridable properties are:
   * `jenkins.version`: The Jenkins version required by the plugin. **Mandatory.**
-  * `java.level`: The Java version to use to build the plugin. **Mandatory.** Should match the minimum Java version for the selected Jenkins version.
      See [Java Support](#java-support) for more info.
   * `jenkins-test-harness.version`: The [JTH version](https://github.com/jenkinsci/jenkins-test-harness/releases) used to test plugin.
   Uses split test-harness (see [JENKINS-32478](https://issues.jenkins-ci.org/browse/JENKINS-32478)).
@@ -46,7 +45,6 @@ In order to use the new POM:
 ```xml
   <properties>
     <jenkins.version>2.303.1</jenkins.version>
-    <java.level>8</java.level>
   </properties>
 ```
 
@@ -58,10 +56,9 @@ If you had a `jar:test-jar` execution, delete it and add to `properties`:
 
 ## Java support
 
-The plugin POM is designed for plugin builds with JDK 8 or above,
-but target `java.level` for a plugin may differ from a JDK version used for the build.
+The plugin POM is designed for plugin builds with JDK 8 or above.
 Starting from Plugin POM `3.44`, support of Java 7 targets in Plugin POM is deprecated and has been removed in `4.0`,
-`java.level=8` and `jenkins.version>2.249.1` are expected to be used for most plugins.
+`jenkins.version>2.249.1` is expected to be used for most plugins.
 
 
 ## Incrementals

pom.xml

@@ -68,7 +68,6 @@
 
     <hpi-plugin.version>3.26</hpi-plugin.version>
     <stapler-plugin.version>1.17</stapler-plugin.version>
-    <java.level>you-must-override-the-java.level-property</java.level>
 
     <!-- Defines a SpotBugs threshold. Use "Low" to discover low-priority bugs.
          Hint: SpotBugs considers some real NPE risks in Jenkins as low-priority issues, it is recommended to enable it in plugins.
@@ -339,7 +338,7 @@
           <artifactId>maven-javadoc-plugin</artifactId>
           <version>3.3.2</version>
           <configuration>
-            <source>${java.level}</source>
+            <source>8</source>
             <quiet>true</quiet>
             <links>
               <link>https://javadoc.jenkins.io/</link>
@@ -515,7 +514,7 @@
                 </requirePluginVersions>
                 -->
                 <enforceBytecodeVersion>
-                  <maxJdkVersion>1.${java.level}</maxJdkVersion>
+                  <maxJdkVersion>1.8</maxJdkVersion>
                   <ignoredScopes>
                     <ignoredScope>test</ignoredScope>
                   </ignoredScopes>
@@ -552,7 +551,7 @@
                           </execution>
                       </executions>
                   </plugin>
-                  (or just override java.level) -->
+                  -->
                 </enforceBytecodeVersion>
                 <bannedDependencies>
                   <excludes>
@@ -699,10 +698,10 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
-          <source>1.${java.level}</source>
-          <target>1.${java.level}</target>
-          <testSource>1.${java.level}</testSource>
-          <testTarget>1.${java.level}</testTarget>
+          <source>1.8</source>
+          <target>1.8</target>
+          <testSource>1.8</testSource>
+          <testTarget>1.8</testTarget>
           <!--
             Work around MCOMPILER-346.
             TODO When MCOMPILER-346 is resolved, this should be deleted.
@@ -716,7 +715,7 @@
         <configuration>
           <signature>
             <groupId>org.codehaus.mojo.signature</groupId>
-            <artifactId>java1${java.level}</artifactId>
+            <artifactId>java18</artifactId>
           </signature>
         </configuration>
         <executions>
@@ -741,7 +740,7 @@
           <webApp>
             <contextPath>/jenkins</contextPath>
           </webApp>
-          <minimumJavaVersion>1.${java.level}</minimumJavaVersion>
+          <minimumJavaVersion>1.8</minimumJavaVersion>
           <systemProperties>
             <hudson.Main.development>${hudson.Main.development}</hudson.Main.development>
           </systemProperties>
@@ -946,18 +945,6 @@
   </build>
 
   <profiles>
-    <profile>
-      <id>uninherited-java.level</id>
-      <activation>
-        <file>
-          <!-- just something that is only here -->
-          <exists>${basedir}/src/it/undefined-java-level/pom.xml</exists>
-        </file>
-      </activation>
-      <properties>
-        <java.level>8</java.level>
-      </properties>
-    </profile>
     <profile>
       <id>jdk-above-9</id>
       <activation>
@@ -968,8 +955,8 @@
           <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
             <configuration>
-              <release>${java.level}</release>
-              <testRelease>${java.level}</testRelease>
+              <release>8</release>
+              <testRelease>8</testRelease>
             </configuration>
           </plugin>
         </plugins>

src/it/benchmark/pom.xml

@@ -14,7 +14,6 @@
     <packaging>jar</packaging>
     <properties>
         <jenkins.version>2.249</jenkins.version>
-        <java.level>8</java.level>
     </properties>
     <repositories>
         <repository>

src/it/beta-fail/pom.xml

@@ -14,7 +14,6 @@
     <packaging>pom</packaging>
     <properties>
         <jenkins.version>2.277.4</jenkins.version>
-        <java.level>8</java.level>
         <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
     </properties>
     <repositories>

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

@@ -14,7 +14,6 @@
     <packaging>pom</packaging>
     <properties>
         <jenkins.version>2.277.4</jenkins.version>
-        <java.level>8</java.level>
         <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
     </properties>
     <repositories>

src/it/beta-pass/pom.xml

@@ -14,7 +14,6 @@
     <packaging>pom</packaging>
     <properties>
         <jenkins.version>2.277.4</jenkins.version>
-        <java.level>8</java.level>
         <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
     </properties>
     <repositories>

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

@@ -15,7 +15,6 @@
         <revision>1.0</revision>
         <changelist>-SNAPSHOT</changelist>
         <jenkins.version>2.249</jenkins.version>
-        <java.level>8</java.level>
     </properties>
 
     <repositories>

src/it/localizer/pom.xml

@@ -14,7 +14,6 @@
     <packaging>hpi</packaging>
     <properties>
         <jenkins.version>2.277.4</jenkins.version>
-        <java.level>8</java.level>
         <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
     </properties>
     <repositories>

src/it/sample-plugin/pom.xml

@@ -14,7 +14,6 @@
     <packaging>hpi</packaging>
     <properties>
         <jenkins.version>2.249</jenkins.version>
-        <java.level>8</java.level>
     </properties>
     <repositories>
         <repository>