elharo commented on code in PR #618:
URL: https://github.com/apache/maven-jar-plugin/pull/618#discussion_r4306699791


##########
src/main/java/org/apache/maven/plugins/jar/ManifestBuilder.java:
##########
@@ -0,0 +1,361 @@
+/*
+ * 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 java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.maven.api.Dependency;
+import org.apache.maven.api.PathScope;
+import org.apache.maven.api.Project;
+import org.apache.maven.api.Session;
+import org.apache.maven.api.model.Model;
+import org.apache.maven.api.model.Plugin;
+import org.apache.maven.api.plugin.MojoException;
+import org.apache.maven.api.services.DependencyResolver;
+import org.apache.maven.api.services.DependencyResolverResult;
+import org.apache.maven.api.services.Interpolator;
+import org.apache.maven.api.xml.XmlNode;
+
+/**
+ * Builds a {@link Manifest} from the Maven project and plugin configuration.
+ */
+final class ManifestBuilder {
+
+    static final String CLASSPATH_LAYOUT_TYPE_SIMPLE = "simple";
+    private static final String CLASSPATH_LAYOUT_TYPE_REPOSITORY = 
"repository";
+    private static final String CLASSPATH_LAYOUT_TYPE_CUSTOM = "custom";
+
+    // Attribute name constants not predefined in java.util.jar.Attributes.Name
+    private static final Attributes.Name JAVA_VERSION = new 
Attributes.Name("Java-Version");
+    private static final Attributes.Name BUILD_JDK_SPEC = new 
Attributes.Name("Build-Jdk-Spec");
+    private static final Attributes.Name BUILD_JDK = new 
Attributes.Name("Build-Jdk");
+    private static final Attributes.Name BUILT_BY = new 
Attributes.Name("Built-By");
+
+    private static final String SIMPLE_LAYOUT =
+            
"${artifact.artifactId}-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String SIMPLE_LAYOUT_NONUNIQUE =
+            
"${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT_NONUNIQUE =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+
+    private final Session session;
+    private final Project project;
+    private final ArchiveConfiguration archive;
+
+    ManifestBuilder(Session session, Project project, ArchiveConfiguration 
archive) {
+        this.session = session;
+        this.project = project;
+        this.archive = archive;
+    }
+
+    /**
+     * Builds the manifest.
+     *
+     * @return the manifest, never {@code null}
+     * @throws MojoException if the manifest cannot be built
+     */
+    Manifest build() {
+        Manifest manifest = new Manifest();
+        Attributes main = manifest.getMainAttributes();
+        // Manifest-Version must be present or java.util.jar.Manifest.write() 
silently drops all main attributes.
+        main.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        if (config.addDefaultEntries) {
+            addDefaultEntries(main);
+        }
+
+        if (config.addBuildEnvironmentEntries) {
+            addBuildEnvironmentEntries(main);
+        }
+
+        if (config.addClasspath) {
+            String classpath = buildClasspath();
+            if (!classpath.isEmpty()) {
+                main.put(Attributes.Name.CLASS_PATH, classpath);
+            }
+        }
+
+        if (config.addDefaultSpecificationEntries) {
+            addSpecificationEntries(main);
+        }
+
+        if (config.addDefaultImplementationEntries) {
+            addImplementationEntries(main);
+        }
+
+        putIfAbsent(main, Attributes.Name.MAIN_CLASS, config.mainClass);
+
+        // Merge any extra entries from <archive><manifestEntries>
+        for (Map.Entry<String, String> entry : 
archive.manifestEntries.entrySet()) {
+            String key = entry.getKey();
+            String value = sanitize(entry.getValue());
+            if (key.equals(Attributes.Name.CLASS_PATH.toString())) {
+                // User-supplied value goes first (takes precedence), then 
programmatic one.
+                main.merge(
+                        Attributes.Name.CLASS_PATH, value, (existing, 
supplied) -> (String) supplied + ' ' + existing);
+            } else {
+                main.putValue(key, value);
+            }
+        }
+
+        // Extra manifest sections from <archive><manifestSections>
+        for (ArchiveConfiguration.ManifestSection section : 
archive.manifestSections) {
+            if (section.name == null || section.name.isBlank()) {
+                throw new MojoException("Each <manifestSection> must declare a 
non-empty <name>.");
+            }
+            Attributes attrs = new Attributes();
+            for (Map.Entry<String, String> e : 
section.manifestEntries.entrySet()) {
+                attrs.putValue(e.getKey(), sanitize(e.getValue()));
+            }
+            manifest.getEntries().put(section.name, attrs);
+        }
+
+        return manifest;
+    }
+
+    private void addDefaultEntries(Attributes main) {
+        // Java-Version reflects the compiler target (e.g. "11"), as set by 
maven-compiler-plugin.
+        putIfAbsent(main, JAVA_VERSION, 
discoverJavaRelease(project.getModel()));
+    }
+
+    private void addBuildEnvironmentEntries(Attributes main) {
+        // Build-Jdk-Spec reflects the runtime JDK specification version.
+        putIfAbsent(main, BUILD_JDK_SPEC, 
System.getProperty("java.specification.version"));
+        putIfAbsent(main, BUILD_JDK, System.getProperty("java.version"));
+        putIfAbsent(main, BUILT_BY, System.getProperty("user.name"));
+    }
+
+    private void addSpecificationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.SPECIFICATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.SPECIFICATION_VERSION, 
specificationVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.SPECIFICATION_VENDOR, 
organization.getName());
+        }
+    }
+
+    private void addImplementationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.IMPLEMENTATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VERSION, 
project.getVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR, 
organization.getName());
+        }
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR_ID, 
project.getGroupId());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_URL, 
project.getModel().getUrl());
+    }
+
+    /**
+     * Resolves the runtime dependencies and builds the {@code Class-Path} 
manifest value.
+     */
+    private String buildClasspath() {
+        DependencyResolverResult result =
+                session.getService(DependencyResolver.class).resolve(session, 
project, PathScope.MAIN_RUNTIME);
+
+        Interpolator interpolator = session.getService(Interpolator.class);
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        String prefix = config.classpathPrefix;
+        String layoutType = config.classpathLayoutType;
+        String customLayout = config.customClasspathLayout;
+        boolean uniqueVersions = config.useUniqueVersions;
+
+        var classpath = new StringBuilder();
+        String layout = resolveLayout(layoutType, customLayout, 
uniqueVersions);
+        for (Map.Entry<Dependency, Path> entry : 
result.getDependencies().entrySet()) {
+            Path artifactFile = entry.getValue();
+            if (artifactFile == null || !Files.isRegularFile(artifactFile)) {
+                continue;
+            }
+            Dependency dep = entry.getKey();
+            if (!classpath.isEmpty()) {
+                classpath.append(' ');
+            }
+            if (prefix != null) {
+                classpath.append(prefix);
+            }
+            String interpolated = interpolator.interpolate(layout, key -> 
resolveArtifactExpression(dep, key));
+            if (interpolated != null) {
+                classpath.append(interpolated);
+            } else {
+                classpath.append(artifactFile.getFileName());
+            }
+        }
+        return classpath.toString();
+    }
+
+    /**
+     * Returns the layout template to use based on the configuration.
+     */
+    private static String resolveLayout(String layoutType, String 
customLayout, boolean uniqueVersions) {
+        return switch (layoutType == null ? CLASSPATH_LAYOUT_TYPE_SIMPLE : 
layoutType) {

Review Comment:
   Looking at these here, I think these would likely be clearer as simple 
string literals too



##########
src/main/java/org/apache/maven/plugins/jar/ManifestBuilder.java:
##########
@@ -0,0 +1,361 @@
+/*
+ * 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 java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.maven.api.Dependency;
+import org.apache.maven.api.PathScope;
+import org.apache.maven.api.Project;
+import org.apache.maven.api.Session;
+import org.apache.maven.api.model.Model;
+import org.apache.maven.api.model.Plugin;
+import org.apache.maven.api.plugin.MojoException;
+import org.apache.maven.api.services.DependencyResolver;
+import org.apache.maven.api.services.DependencyResolverResult;
+import org.apache.maven.api.services.Interpolator;
+import org.apache.maven.api.xml.XmlNode;
+
+/**
+ * Builds a {@link Manifest} from the Maven project and plugin configuration.
+ */
+final class ManifestBuilder {
+
+    static final String CLASSPATH_LAYOUT_TYPE_SIMPLE = "simple";
+    private static final String CLASSPATH_LAYOUT_TYPE_REPOSITORY = 
"repository";
+    private static final String CLASSPATH_LAYOUT_TYPE_CUSTOM = "custom";
+
+    // Attribute name constants not predefined in java.util.jar.Attributes.Name
+    private static final Attributes.Name JAVA_VERSION = new 
Attributes.Name("Java-Version");

Review Comment:
   These really aren't helpful. They are less clear than the literal strings. 
They are unlikely to change values. They aren't used outside this class. All 
this does is change the capitalization convention. Just inline them.



##########
src/main/java/org/apache/maven/plugins/jar/ManifestBuilder.java:
##########
@@ -0,0 +1,361 @@
+/*
+ * 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 java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.maven.api.Dependency;
+import org.apache.maven.api.PathScope;
+import org.apache.maven.api.Project;
+import org.apache.maven.api.Session;
+import org.apache.maven.api.model.Model;
+import org.apache.maven.api.model.Plugin;
+import org.apache.maven.api.plugin.MojoException;
+import org.apache.maven.api.services.DependencyResolver;
+import org.apache.maven.api.services.DependencyResolverResult;
+import org.apache.maven.api.services.Interpolator;
+import org.apache.maven.api.xml.XmlNode;
+
+/**
+ * Builds a {@link Manifest} from the Maven project and plugin configuration.
+ */
+final class ManifestBuilder {
+
+    static final String CLASSPATH_LAYOUT_TYPE_SIMPLE = "simple";
+    private static final String CLASSPATH_LAYOUT_TYPE_REPOSITORY = 
"repository";
+    private static final String CLASSPATH_LAYOUT_TYPE_CUSTOM = "custom";
+
+    // Attribute name constants not predefined in java.util.jar.Attributes.Name
+    private static final Attributes.Name JAVA_VERSION = new 
Attributes.Name("Java-Version");
+    private static final Attributes.Name BUILD_JDK_SPEC = new 
Attributes.Name("Build-Jdk-Spec");
+    private static final Attributes.Name BUILD_JDK = new 
Attributes.Name("Build-Jdk");
+    private static final Attributes.Name BUILT_BY = new 
Attributes.Name("Built-By");
+
+    private static final String SIMPLE_LAYOUT =
+            
"${artifact.artifactId}-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String SIMPLE_LAYOUT_NONUNIQUE =
+            
"${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT_NONUNIQUE =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+
+    private final Session session;
+    private final Project project;
+    private final ArchiveConfiguration archive;
+
+    ManifestBuilder(Session session, Project project, ArchiveConfiguration 
archive) {
+        this.session = session;
+        this.project = project;
+        this.archive = archive;
+    }
+
+    /**
+     * Builds the manifest.
+     *
+     * @return the manifest, never {@code null}
+     * @throws MojoException if the manifest cannot be built
+     */
+    Manifest build() {
+        Manifest manifest = new Manifest();
+        Attributes main = manifest.getMainAttributes();
+        // Manifest-Version must be present or java.util.jar.Manifest.write() 
silently drops all main attributes.
+        main.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        if (config.addDefaultEntries) {
+            addDefaultEntries(main);
+        }
+
+        if (config.addBuildEnvironmentEntries) {
+            addBuildEnvironmentEntries(main);
+        }
+
+        if (config.addClasspath) {
+            String classpath = buildClasspath();
+            if (!classpath.isEmpty()) {
+                main.put(Attributes.Name.CLASS_PATH, classpath);
+            }
+        }
+
+        if (config.addDefaultSpecificationEntries) {
+            addSpecificationEntries(main);
+        }
+
+        if (config.addDefaultImplementationEntries) {
+            addImplementationEntries(main);
+        }
+
+        putIfAbsent(main, Attributes.Name.MAIN_CLASS, config.mainClass);
+
+        // Merge any extra entries from <archive><manifestEntries>
+        for (Map.Entry<String, String> entry : 
archive.manifestEntries.entrySet()) {
+            String key = entry.getKey();
+            String value = sanitize(entry.getValue());
+            if (key.equals(Attributes.Name.CLASS_PATH.toString())) {
+                // User-supplied value goes first (takes precedence), then 
programmatic one.
+                main.merge(
+                        Attributes.Name.CLASS_PATH, value, (existing, 
supplied) -> (String) supplied + ' ' + existing);
+            } else {
+                main.putValue(key, value);
+            }
+        }
+
+        // Extra manifest sections from <archive><manifestSections>
+        for (ArchiveConfiguration.ManifestSection section : 
archive.manifestSections) {
+            if (section.name == null || section.name.isBlank()) {
+                throw new MojoException("Each <manifestSection> must declare a 
non-empty <name>.");
+            }
+            Attributes attrs = new Attributes();
+            for (Map.Entry<String, String> e : 
section.manifestEntries.entrySet()) {
+                attrs.putValue(e.getKey(), sanitize(e.getValue()));
+            }
+            manifest.getEntries().put(section.name, attrs);
+        }
+
+        return manifest;
+    }
+
+    private void addDefaultEntries(Attributes main) {
+        // Java-Version reflects the compiler target (e.g. "11"), as set by 
maven-compiler-plugin.
+        putIfAbsent(main, JAVA_VERSION, 
discoverJavaRelease(project.getModel()));
+    }
+
+    private void addBuildEnvironmentEntries(Attributes main) {
+        // Build-Jdk-Spec reflects the runtime JDK specification version.
+        putIfAbsent(main, BUILD_JDK_SPEC, 
System.getProperty("java.specification.version"));
+        putIfAbsent(main, BUILD_JDK, System.getProperty("java.version"));
+        putIfAbsent(main, BUILT_BY, System.getProperty("user.name"));
+    }
+
+    private void addSpecificationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.SPECIFICATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.SPECIFICATION_VERSION, 
specificationVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.SPECIFICATION_VENDOR, 
organization.getName());
+        }
+    }
+
+    private void addImplementationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.IMPLEMENTATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VERSION, 
project.getVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR, 
organization.getName());
+        }
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR_ID, 
project.getGroupId());

Review Comment:
   These deprecations look important Possibly we shouldn't be putting these in 
our JARs



##########
src/main/java/org/apache/maven/plugins/jar/ManifestBuilder.java:
##########
@@ -0,0 +1,361 @@
+/*
+ * 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 java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.maven.api.Dependency;
+import org.apache.maven.api.PathScope;
+import org.apache.maven.api.Project;
+import org.apache.maven.api.Session;
+import org.apache.maven.api.model.Model;
+import org.apache.maven.api.model.Plugin;
+import org.apache.maven.api.plugin.MojoException;
+import org.apache.maven.api.services.DependencyResolver;
+import org.apache.maven.api.services.DependencyResolverResult;
+import org.apache.maven.api.services.Interpolator;
+import org.apache.maven.api.xml.XmlNode;
+
+/**
+ * Builds a {@link Manifest} from the Maven project and plugin configuration.
+ */
+final class ManifestBuilder {
+
+    static final String CLASSPATH_LAYOUT_TYPE_SIMPLE = "simple";
+    private static final String CLASSPATH_LAYOUT_TYPE_REPOSITORY = 
"repository";
+    private static final String CLASSPATH_LAYOUT_TYPE_CUSTOM = "custom";
+
+    // Attribute name constants not predefined in java.util.jar.Attributes.Name
+    private static final Attributes.Name JAVA_VERSION = new 
Attributes.Name("Java-Version");
+    private static final Attributes.Name BUILD_JDK_SPEC = new 
Attributes.Name("Build-Jdk-Spec");
+    private static final Attributes.Name BUILD_JDK = new 
Attributes.Name("Build-Jdk");
+    private static final Attributes.Name BUILT_BY = new 
Attributes.Name("Built-By");
+
+    private static final String SIMPLE_LAYOUT =
+            
"${artifact.artifactId}-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String SIMPLE_LAYOUT_NONUNIQUE =
+            
"${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT_NONUNIQUE =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+
+    private final Session session;
+    private final Project project;
+    private final ArchiveConfiguration archive;
+
+    ManifestBuilder(Session session, Project project, ArchiveConfiguration 
archive) {
+        this.session = session;
+        this.project = project;
+        this.archive = archive;
+    }
+
+    /**
+     * Builds the manifest.
+     *
+     * @return the manifest, never {@code null}
+     * @throws MojoException if the manifest cannot be built
+     */
+    Manifest build() {
+        Manifest manifest = new Manifest();
+        Attributes main = manifest.getMainAttributes();
+        // Manifest-Version must be present or java.util.jar.Manifest.write() 
silently drops all main attributes.
+        main.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        if (config.addDefaultEntries) {
+            addDefaultEntries(main);
+        }
+
+        if (config.addBuildEnvironmentEntries) {
+            addBuildEnvironmentEntries(main);
+        }
+
+        if (config.addClasspath) {
+            String classpath = buildClasspath();
+            if (!classpath.isEmpty()) {
+                main.put(Attributes.Name.CLASS_PATH, classpath);
+            }
+        }
+
+        if (config.addDefaultSpecificationEntries) {
+            addSpecificationEntries(main);
+        }
+
+        if (config.addDefaultImplementationEntries) {
+            addImplementationEntries(main);
+        }
+
+        putIfAbsent(main, Attributes.Name.MAIN_CLASS, config.mainClass);
+
+        // Merge any extra entries from <archive><manifestEntries>
+        for (Map.Entry<String, String> entry : 
archive.manifestEntries.entrySet()) {
+            String key = entry.getKey();
+            String value = sanitize(entry.getValue());
+            if (key.equals(Attributes.Name.CLASS_PATH.toString())) {
+                // User-supplied value goes first (takes precedence), then 
programmatic one.
+                main.merge(
+                        Attributes.Name.CLASS_PATH, value, (existing, 
supplied) -> (String) supplied + ' ' + existing);
+            } else {
+                main.putValue(key, value);
+            }
+        }
+
+        // Extra manifest sections from <archive><manifestSections>
+        for (ArchiveConfiguration.ManifestSection section : 
archive.manifestSections) {
+            if (section.name == null || section.name.isBlank()) {
+                throw new MojoException("Each <manifestSection> must declare a 
non-empty <name>.");
+            }
+            Attributes attrs = new Attributes();
+            for (Map.Entry<String, String> e : 
section.manifestEntries.entrySet()) {
+                attrs.putValue(e.getKey(), sanitize(e.getValue()));
+            }
+            manifest.getEntries().put(section.name, attrs);
+        }
+
+        return manifest;
+    }
+
+    private void addDefaultEntries(Attributes main) {
+        // Java-Version reflects the compiler target (e.g. "11"), as set by 
maven-compiler-plugin.
+        putIfAbsent(main, JAVA_VERSION, 
discoverJavaRelease(project.getModel()));
+    }
+
+    private void addBuildEnvironmentEntries(Attributes main) {
+        // Build-Jdk-Spec reflects the runtime JDK specification version.
+        putIfAbsent(main, BUILD_JDK_SPEC, 
System.getProperty("java.specification.version"));
+        putIfAbsent(main, BUILD_JDK, System.getProperty("java.version"));
+        putIfAbsent(main, BUILT_BY, System.getProperty("user.name"));
+    }
+
+    private void addSpecificationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.SPECIFICATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.SPECIFICATION_VERSION, 
specificationVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.SPECIFICATION_VENDOR, 
organization.getName());
+        }
+    }
+
+    private void addImplementationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.IMPLEMENTATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VERSION, 
project.getVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR, 
organization.getName());
+        }
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR_ID, 
project.getGroupId());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_URL, 
project.getModel().getUrl());
+    }
+
+    /**
+     * Resolves the runtime dependencies and builds the {@code Class-Path} 
manifest value.
+     */
+    private String buildClasspath() {
+        DependencyResolverResult result =
+                session.getService(DependencyResolver.class).resolve(session, 
project, PathScope.MAIN_RUNTIME);
+
+        Interpolator interpolator = session.getService(Interpolator.class);
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        String prefix = config.classpathPrefix;
+        String layoutType = config.classpathLayoutType;
+        String customLayout = config.customClasspathLayout;
+        boolean uniqueVersions = config.useUniqueVersions;
+
+        var classpath = new StringBuilder();
+        String layout = resolveLayout(layoutType, customLayout, 
uniqueVersions);
+        for (Map.Entry<Dependency, Path> entry : 
result.getDependencies().entrySet()) {
+            Path artifactFile = entry.getValue();
+            if (artifactFile == null || !Files.isRegularFile(artifactFile)) {
+                continue;
+            }
+            Dependency dep = entry.getKey();
+            if (!classpath.isEmpty()) {
+                classpath.append(' ');
+            }
+            if (prefix != null) {
+                classpath.append(prefix);
+            }
+            String interpolated = interpolator.interpolate(layout, key -> 
resolveArtifactExpression(dep, key));
+            if (interpolated != null) {
+                classpath.append(interpolated);
+            } else {
+                classpath.append(artifactFile.getFileName());
+            }
+        }
+        return classpath.toString();
+    }
+
+    /**
+     * Returns the layout template to use based on the configuration.
+     */
+    private static String resolveLayout(String layoutType, String 
customLayout, boolean uniqueVersions) {
+        return switch (layoutType == null ? CLASSPATH_LAYOUT_TYPE_SIMPLE : 
layoutType) {
+            case CLASSPATH_LAYOUT_TYPE_SIMPLE -> uniqueVersions ? 
SIMPLE_LAYOUT : SIMPLE_LAYOUT_NONUNIQUE;
+            case CLASSPATH_LAYOUT_TYPE_REPOSITORY -> uniqueVersions ? 
REPOSITORY_LAYOUT : REPOSITORY_LAYOUT_NONUNIQUE;
+            case CLASSPATH_LAYOUT_TYPE_CUSTOM -> {
+                if (customLayout == null) {
+                    throw new MojoException("Classpath layout type 'custom' 
requires a <customClasspathLayout> value.");
+                }
+                yield customLayout;
+            }
+            default -> throw new MojoException("Unknown classpath layout type: 
'" + layoutType + "'.");
+        };
+    }
+
+    /**
+     * Resolves a single interpolation key for a dependency in the classpath 
layout.
+     * Supports the {@code artifact.*} prefix family used by maven-archiver.
+     */
+    private static String resolveArtifactExpression(Dependency dep, String 
key) {
+        // Strip "artifact." prefix
+        String k = key.startsWith("artifact.") ? 
key.substring("artifact.".length()) : key;
+        return switch (k) {
+            case "artifactId" -> dep.getArtifactId();
+            case "groupId" -> dep.getGroupId();
+            case "groupIdPath" -> dep.getGroupId().replace('.', '/');
+            case "version" -> dep.getVersion().toString();
+            case "baseVersion" -> dep.getBaseVersion().toString();
+            case "extension" -> dep.getType().getExtension();
+            case "classifier" -> dep.getClassifier() != null ? 
dep.getClassifier() : "";
+            case "dashClassifier", "dashClassifier?" -> {
+                String c = dep.getClassifier();

Review Comment:
   c --> classifier



##########
src/main/java/org/apache/maven/plugins/jar/ManifestBuilder.java:
##########
@@ -0,0 +1,361 @@
+/*
+ * 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 java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.maven.api.Dependency;
+import org.apache.maven.api.PathScope;
+import org.apache.maven.api.Project;
+import org.apache.maven.api.Session;
+import org.apache.maven.api.model.Model;
+import org.apache.maven.api.model.Plugin;
+import org.apache.maven.api.plugin.MojoException;
+import org.apache.maven.api.services.DependencyResolver;
+import org.apache.maven.api.services.DependencyResolverResult;
+import org.apache.maven.api.services.Interpolator;
+import org.apache.maven.api.xml.XmlNode;
+
+/**
+ * Builds a {@link Manifest} from the Maven project and plugin configuration.
+ */
+final class ManifestBuilder {
+
+    static final String CLASSPATH_LAYOUT_TYPE_SIMPLE = "simple";
+    private static final String CLASSPATH_LAYOUT_TYPE_REPOSITORY = 
"repository";
+    private static final String CLASSPATH_LAYOUT_TYPE_CUSTOM = "custom";
+
+    // Attribute name constants not predefined in java.util.jar.Attributes.Name
+    private static final Attributes.Name JAVA_VERSION = new 
Attributes.Name("Java-Version");
+    private static final Attributes.Name BUILD_JDK_SPEC = new 
Attributes.Name("Build-Jdk-Spec");
+    private static final Attributes.Name BUILD_JDK = new 
Attributes.Name("Build-Jdk");
+    private static final Attributes.Name BUILT_BY = new 
Attributes.Name("Built-By");
+
+    private static final String SIMPLE_LAYOUT =
+            
"${artifact.artifactId}-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String SIMPLE_LAYOUT_NONUNIQUE =
+            
"${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.version}${dashClassifier?}.${artifact.extension}";
+    private static final String REPOSITORY_LAYOUT_NONUNIQUE =
+            
"${artifact.groupIdPath}/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}"
+                    + 
"-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}";
+
+    private final Session session;
+    private final Project project;
+    private final ArchiveConfiguration archive;
+
+    ManifestBuilder(Session session, Project project, ArchiveConfiguration 
archive) {
+        this.session = session;
+        this.project = project;
+        this.archive = archive;
+    }
+
+    /**
+     * Builds the manifest.
+     *
+     * @return the manifest, never {@code null}
+     * @throws MojoException if the manifest cannot be built
+     */
+    Manifest build() {
+        Manifest manifest = new Manifest();
+        Attributes main = manifest.getMainAttributes();
+        // Manifest-Version must be present or java.util.jar.Manifest.write() 
silently drops all main attributes.
+        main.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        if (config.addDefaultEntries) {
+            addDefaultEntries(main);
+        }
+
+        if (config.addBuildEnvironmentEntries) {
+            addBuildEnvironmentEntries(main);
+        }
+
+        if (config.addClasspath) {
+            String classpath = buildClasspath();
+            if (!classpath.isEmpty()) {
+                main.put(Attributes.Name.CLASS_PATH, classpath);
+            }
+        }
+
+        if (config.addDefaultSpecificationEntries) {
+            addSpecificationEntries(main);
+        }
+
+        if (config.addDefaultImplementationEntries) {
+            addImplementationEntries(main);
+        }
+
+        putIfAbsent(main, Attributes.Name.MAIN_CLASS, config.mainClass);
+
+        // Merge any extra entries from <archive><manifestEntries>
+        for (Map.Entry<String, String> entry : 
archive.manifestEntries.entrySet()) {
+            String key = entry.getKey();
+            String value = sanitize(entry.getValue());
+            if (key.equals(Attributes.Name.CLASS_PATH.toString())) {
+                // User-supplied value goes first (takes precedence), then 
programmatic one.
+                main.merge(
+                        Attributes.Name.CLASS_PATH, value, (existing, 
supplied) -> (String) supplied + ' ' + existing);
+            } else {
+                main.putValue(key, value);
+            }
+        }
+
+        // Extra manifest sections from <archive><manifestSections>
+        for (ArchiveConfiguration.ManifestSection section : 
archive.manifestSections) {
+            if (section.name == null || section.name.isBlank()) {
+                throw new MojoException("Each <manifestSection> must declare a 
non-empty <name>.");
+            }
+            Attributes attrs = new Attributes();
+            for (Map.Entry<String, String> e : 
section.manifestEntries.entrySet()) {
+                attrs.putValue(e.getKey(), sanitize(e.getValue()));
+            }
+            manifest.getEntries().put(section.name, attrs);
+        }
+
+        return manifest;
+    }
+
+    private void addDefaultEntries(Attributes main) {
+        // Java-Version reflects the compiler target (e.g. "11"), as set by 
maven-compiler-plugin.
+        putIfAbsent(main, JAVA_VERSION, 
discoverJavaRelease(project.getModel()));
+    }
+
+    private void addBuildEnvironmentEntries(Attributes main) {
+        // Build-Jdk-Spec reflects the runtime JDK specification version.
+        putIfAbsent(main, BUILD_JDK_SPEC, 
System.getProperty("java.specification.version"));
+        putIfAbsent(main, BUILD_JDK, System.getProperty("java.version"));
+        putIfAbsent(main, BUILT_BY, System.getProperty("user.name"));
+    }
+
+    private void addSpecificationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.SPECIFICATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.SPECIFICATION_VERSION, 
specificationVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.SPECIFICATION_VENDOR, 
organization.getName());
+        }
+    }
+
+    private void addImplementationEntries(Attributes main) {
+        putIfAbsent(
+                main, Attributes.Name.IMPLEMENTATION_TITLE, 
project.getModel().getName());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VERSION, 
project.getVersion());
+        var organization = project.getModel().getOrganization();
+        if (organization != null) {
+            putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR, 
organization.getName());
+        }
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_VENDOR_ID, 
project.getGroupId());
+        putIfAbsent(main, Attributes.Name.IMPLEMENTATION_URL, 
project.getModel().getUrl());
+    }
+
+    /**
+     * Resolves the runtime dependencies and builds the {@code Class-Path} 
manifest value.
+     */
+    private String buildClasspath() {
+        DependencyResolverResult result =
+                session.getService(DependencyResolver.class).resolve(session, 
project, PathScope.MAIN_RUNTIME);
+
+        Interpolator interpolator = session.getService(Interpolator.class);
+        ArchiveConfiguration.ManifestConfig config = archive.manifest;
+        String prefix = config.classpathPrefix;
+        String layoutType = config.classpathLayoutType;
+        String customLayout = config.customClasspathLayout;
+        boolean uniqueVersions = config.useUniqueVersions;
+
+        var classpath = new StringBuilder();
+        String layout = resolveLayout(layoutType, customLayout, 
uniqueVersions);
+        for (Map.Entry<Dependency, Path> entry : 
result.getDependencies().entrySet()) {
+            Path artifactFile = entry.getValue();
+            if (artifactFile == null || !Files.isRegularFile(artifactFile)) {
+                continue;
+            }
+            Dependency dep = entry.getKey();
+            if (!classpath.isEmpty()) {
+                classpath.append(' ');
+            }
+            if (prefix != null) {
+                classpath.append(prefix);
+            }
+            String interpolated = interpolator.interpolate(layout, key -> 
resolveArtifactExpression(dep, key));
+            if (interpolated != null) {
+                classpath.append(interpolated);
+            } else {
+                classpath.append(artifactFile.getFileName());
+            }
+        }
+        return classpath.toString();
+    }
+
+    /**
+     * Returns the layout template to use based on the configuration.
+     */
+    private static String resolveLayout(String layoutType, String 
customLayout, boolean uniqueVersions) {
+        return switch (layoutType == null ? CLASSPATH_LAYOUT_TYPE_SIMPLE : 
layoutType) {
+            case CLASSPATH_LAYOUT_TYPE_SIMPLE -> uniqueVersions ? 
SIMPLE_LAYOUT : SIMPLE_LAYOUT_NONUNIQUE;
+            case CLASSPATH_LAYOUT_TYPE_REPOSITORY -> uniqueVersions ? 
REPOSITORY_LAYOUT : REPOSITORY_LAYOUT_NONUNIQUE;
+            case CLASSPATH_LAYOUT_TYPE_CUSTOM -> {
+                if (customLayout == null) {
+                    throw new MojoException("Classpath layout type 'custom' 
requires a <customClasspathLayout> value.");
+                }
+                yield customLayout;
+            }
+            default -> throw new MojoException("Unknown classpath layout type: 
'" + layoutType + "'.");
+        };
+    }
+
+    /**
+     * Resolves a single interpolation key for a dependency in the classpath 
layout.
+     * Supports the {@code artifact.*} prefix family used by maven-archiver.
+     */
+    private static String resolveArtifactExpression(Dependency dep, String 
key) {
+        // Strip "artifact." prefix
+        String k = key.startsWith("artifact.") ? 
key.substring("artifact.".length()) : key;

Review Comment:
   k --> key



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