[MPMD-379] Add IT for Java 21

src/it/MPMD-379-JDK21/invoker.properties

@@ -0,0 +1,28 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+invoker.java.version = 1.8+
+
+# available toolchains under linux:
+# https://github.com/apache/infrastructure-p6/blob/production/modules/build_nodes/files/toolchains.xml
+
+# the jdk toolchain "21:openjdk" is selected in pom.xml
+invoker.toolchain.jdk.version = 21
+invoker.toolchain.jdk.vendor = openjdk
+
+invoker.goals = clean verify
+invoker.buildResult = failure

src/it/MPMD-379-JDK21/pom.xml

@@ -0,0 +1,95 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.apache.maven.plugins.pmd.it</groupId>
+  <artifactId>MPMD-379-JDK21</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <javaVersion>21</javaVersion>
+  </properties>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>@compilerPluginVersion@</version>
+          <configuration>
+            <target>${javaVersion}</target>
+            <source>${javaVersion}</source>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-pmd-plugin</artifactId>
+        <version>@project.version@</version>
+        <configuration>
+          <linkXRef>false</linkXRef>
+          <skipPmdError>false</skipPmdError>
+          <skip>false</skip>
+          <failOnViolation>true</failOnViolation>
+          <failurePriority>4</failurePriority>
+          <printFailingErrors>true</printFailingErrors>
+          <targetJdk>${javaVersion}</targetJdk>
+          <minimumTokens>100</minimumTokens>
+        </configuration>
+        <executions>
+          <execution>
+            <id>default</id>
+            <phase>verify</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-toolchains-plugin</artifactId>
+        <version>3.1.0</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>toolchain</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <toolchains>
+            <jdk>
+              <version>${javaVersion}</version>
+              <vendor>openjdk</vendor>
+            </jdk>
+          </toolchains>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/MPMD-379-JDK21/src/main/java/com/mycompany/app/App.java

@@ -0,0 +1,25 @@
+package com.mycompany.app;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+public class App
+{
+
+}

src/it/MPMD-379-JDK21/src/main/java/com/mycompany/app/Foo.java

@@ -0,0 +1,30 @@
+package com.mycompany.app;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.ArrayList;
+
+public class Foo
+{
+    public Foo( final ArrayList<String> foo )
+    {
+    }
+
+}

src/it/MPMD-379-JDK21/verify.groovy

@@ -0,0 +1,24 @@
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+File buildLog = new File( basedir, 'build.log' )
+assert buildLog.exists()
+assert buildLog.text.contains( '[INFO] PMD Failure: com.mycompany.app.Foo:26 Rule:UnusedFormalParameter Priority:3' )
+assert !buildLog.text.contains( '[WARNING] PMD' )

src/main/java/org/apache/maven/plugins/pmd/PmdReport.java

@@ -63,16 +63,19 @@
 @Mojo(name = "pmd", threadSafe = true, requiresDependencyResolution = ResolutionScope.TEST)
 public class PmdReport extends AbstractPmdReport {
     /**
-     * The target JDK to analyze based on. Should match the source used in the compiler plugin. Valid values
-     * with the default PMD version are
+     * The target JDK to analyze based on. Should match the source used in the compiler plugin.
+     * Valid values depend on the used PMD version. With the default PMD version valid values are
      * currently <code>1.3</code>, <code>1.4</code>, <code>1.5</code>, <code>1.6</code>, <code>1.7</code>,
      * <code>1.8</code>, <code>9</code>, <code>10</code>, <code>11</code>, <code>12</code>, <code>13</code>,
      * <code>14</code>, <code>15</code>, <code>16</code>, <code>17</code>, <code>18</code>, <code>19</code>,
-     * and <code>20</code>.
+     * <code>20</code>, <code>21</code>, and <code>22</code>.
      *
      * <p> You can override the default PMD version by specifying PMD as a dependency,
      * see <a href="examples/upgrading-PMD-at-runtime.html">Upgrading PMD at Runtime</a>.</p>
      *
+     * <p> To see the supported Java versions for each PMD version, see
+     * <a href="https://docs.pmd-code.org/latest/pmd_languages_java.html">Java support (PMD)</a>.</p>
+     *
      * <p>
      *   <b>Note:</b> this parameter is only used if the language parameter is set to <code>java</code>.
      * </p>