[MJAR-62] Set Build-Jdk according to used toolchain

pom.xml

@@ -79,6 +79,18 @@
     <project.build.outputTimestamp>2022-09-12T15:53:21Z</project.build.outputTimestamp>
   </properties>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.junit</groupId>
+        <artifactId>junit-bom</artifactId>
+        <version>5.10.1</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <dependencies>
     <dependency>
       <groupId>org.apache.maven</groupId>
@@ -123,33 +135,31 @@
 
     <!-- Test -->
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>4.13.2</version>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>3.3.0</version>
+      <version>4.0.0-alpha-2</version>
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>org.apache.maven</groupId>
-      <artifactId>maven-compat</artifactId>
-      <version>${mavenVersion}</version>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <version>4.11.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>commons-io</groupId>
-      <artifactId>commons-io</artifactId>
-      <version>2.15.1</version>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-junit-jupiter</artifactId>
+      <version>4.11.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-xml</artifactId>
-      <version>3.0.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -178,6 +188,13 @@
         </plugin>
       </plugins>
     </pluginManagement>
+
+    <plugins>
+      <plugin>
+        <groupId>org.eclipse.sisu</groupId>
+        <artifactId>sisu-maven-plugin</artifactId>
+      </plugin>
+    </plugins>
   </build>
 
   <profiles>

src/it/MJAR-62-toolchain/invoker.properties

@@ -0,0 +1,18 @@
+# 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.toolchain.jdk.version = 17

src/it/MJAR-62-toolchain/pom.xml

@@ -0,0 +1,68 @@
+<?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</groupId>
+  <artifactId>mjar-62</artifactId>
+  <name>MJAR-62</name>
+  <packaging>jar</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <organization>
+    <name>jar plugin it</name>
+  </organization>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <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>17</version>
+            </jdk>
+          </toolchains>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>@project.version@</version>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/MJAR-62-toolchain/src/main/java/myproject/HelloWorld.java

@@ -0,0 +1,36 @@
+package myproject;
+
+/*
+ * 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.
+ */
+
+/**
+ * The classic Hello World App.
+ */
+public class HelloWorld {
+
+  /**
+     * Main method.
+     *
+     * @param args Not used
+     */
+    public static void main( String[] args )
+    {
+        System.out.println( "Hi!" );
+    } 
+}

src/it/MJAR-62-toolchain/verify.groovy

@@ -0,0 +1,26 @@
+/*
+ * 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.jar.JarFile
+
+def mrjar = new JarFile(new File(basedir, 'target/mjar-62-1.0-SNAPSHOT.jar'))
+def manifest = mrjar.manifest.mainAttributes
+
+assert manifest.getValue("Build-Jdk-Spec") == "17"
+assert manifest.getValue("Build-Tool-Jdk-Spec") == System.getProperty("java.specification.version")

src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java

@@ -22,6 +22,7 @@
 import java.nio.file.FileSystems;
 import java.util.Arrays;
 import java.util.Map;
+import java.util.Optional;
 
 import org.apache.maven.archiver.MavenArchiveConfiguration;
 import org.apache.maven.archiver.MavenArchiver;
@@ -34,6 +35,7 @@
 import org.apache.maven.project.MavenProjectHelper;
 import org.apache.maven.shared.model.fileset.FileSet;
 import org.apache.maven.shared.model.fileset.util.FileSetManager;
+import org.apache.maven.toolchain.ToolchainManager;
 import org.codehaus.plexus.archiver.Archiver;
 import org.codehaus.plexus.archiver.jar.JarArchiver;
 
@@ -53,6 +55,12 @@ public abstract class AbstractJarMojo extends AbstractMojo {
 
     private static final String SEPARATOR = FileSystems.getDefault().getSeparator();
 
+    @Component
+    private ToolchainsJdkSpecification toolchainsJdkSpecification;
+
+    @Component
+    private ToolchainManager toolchainManager;
+
     /**
      * List of files to include. Specified as fileset patterns which are relative to the input directory whose contents
      * is being packaged into the JAR.
@@ -250,6 +258,17 @@ public File createArchive() throws MojoExecutionException {
         archiver.setArchiver((JarArchiver) archivers.get(archiverName));
         archiver.setOutputFile(jarFile);
 
+        Optional.ofNullable(toolchainManager.getToolchainFromBuildContext("jdk", session))
+                .ifPresent(toolchain -> toolchainsJdkSpecification
+                        .getJDKSpecification(toolchain)
+                        .ifPresent(jdkSpec -> {
+                            archive.addManifestEntry("Build-Jdk-Spec", jdkSpec);
+                            archive.addManifestEntry(
+                                    "Build-Tool-Jdk-Spec", System.getProperty("java.specification.version"));
+                            archiver.setBuildJdkSpecDefaultEntry(false);
+                            getLog().info("Set Build-Jdk-Spec based on toolchain in maven-jar-plugin " + toolchain);
+                        }));
+
         // configure for Reproducible Builds based on outputTimestamp value
         archiver.configureReproducibleBuild(outputTimestamp);
 

src/main/java/org/apache/maven/plugins/jar/ToolchainsJdkSpecification.java

@@ -0,0 +1,99 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugins.jar;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import org.apache.maven.toolchain.Toolchain;
+import org.codehaus.plexus.util.cli.CommandLineException;
+import org.codehaus.plexus.util.cli.CommandLineUtils;
+import org.codehaus.plexus.util.cli.Commandline;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Component provided JDK specification based on toolchains.
+ */
+@Named
+@Singleton
+class ToolchainsJdkSpecification {
+
+    private final Logger logger = LoggerFactory.getLogger(ToolchainsJdkSpecification.class);
+
+    private final Map<Path, String> cache = new HashMap<>();
+
+    public synchronized Optional<String> getJDKSpecification(Toolchain toolchain) {
+        Optional<Path> javacPath = getJavacPath(toolchain);
+        return javacPath.map(path -> cache.computeIfAbsent(path, this::getSpecForPath));
+    }
+
+    private Optional<Path> getJavacPath(Toolchain toolchain) {
+        return Optional.ofNullable(toolchain.findTool("javac")).map(Paths::get).map(this::getCanonicalPath);
+    }
+
+    private Path getCanonicalPath(Path path) {
+        try {
+            return path.toRealPath();
+        } catch (IOException e) {
+            if (path.getParent() != null) {
+                return getCanonicalPath(path.getParent()).resolve(path.getFileName());
+            } else {
+                throw new UncheckedIOException(e);
+            }
+        }
+    }
+
+    private String getSpecForPath(Path path) {
+        try {
+            Commandline cl = new Commandline(path.toString());
+            cl.createArg().setValue("-version");
+            CommandLineUtils.StringStreamConsumer out = new CommandLineUtils.StringStreamConsumer();
+            CommandLineUtils.StringStreamConsumer err = new CommandLineUtils.StringStreamConsumer();
+            CommandLineUtils.executeCommandLine(cl, out, err);
+            String version = out.getOutput().trim();
+            if (version.isEmpty()) {
+                version = err.getOutput().trim();
+            }
+            if (version.startsWith("javac ")) {
+                version = version.substring(6);
+                if (version.startsWith("1.")) {
+                    version = version.substring(0, 3);
+                } else {
+                    version = version.substring(0, 2);
+                }
+                return version;
+            } else {
+                logger.warn("Unrecognized output form " + path + " -version - " + version);
+                return null;
+            }
+        } catch (CommandLineException | IndexOutOfBoundsException e) {
+            logger.warn("Failed to execute: " + path + " - " + e.getMessage());
+            return null;
+        }
+    }
+}