[MJAVADOC-642] Make offline mode configurable

src/it/projects/MJAVADOC-642/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.goals= package

src/it/projects/MJAVADOC-642/pom.xml

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+~   Licensed 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.apache.maven.plugins.javadoc.it</groupId>
+    <artifactId>mjavadoc642</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <url>https://issues.apache.org/jira/browse/MJAVADOC-642</url>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>@project.version@</version>
+                <executions>
+                    <execution>
+                        <id>javadoc</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                        <phase>package</phase>
+                        <configuration>
+                            <offline>true</offline>
+                            <skip>false</skip>
+                            <detectJavaApiLink>false</detectJavaApiLink>
+                            <detectOfflineLinks>false</detectOfflineLinks>
+                            <failOnWarnings>true</failOnWarnings>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/it/projects/MJAVADOC-642/src/main/java/mjavadoc642/Main.java

@@ -0,0 +1,35 @@
+/*
+ * 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 mjavadoc642;
+
+/**
+ * This is the main class.
+ */
+public final class Main {
+    /**
+     * This is the main method.
+     *
+     * @param args The arguments
+     * @throws Exception if something goes wrong
+     */
+    public static final void main(String ... args) throws Exception {
+        System.out.println("Hello, World!");
+    }
+}

src/it/projects/MJAVADOC-642/verify.groovy

@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+def log = new File( basedir, 'build.log').text
+
+assert log.count("[DEBUG]   (f) offline = false") == 0
+assert log.count("[DEBUG]   (f) offline = true") == 1

src/it/projects/MJAVADOC-642_cmdline/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.goals= -Dmaven.javadoc.offline=true package

src/it/projects/MJAVADOC-642_cmdline/pom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+~   Licensed 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.apache.maven.plugins.javadoc.it</groupId>
+    <artifactId>mjavadoc642</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <url>https://issues.apache.org/jira/browse/MJAVADOC-642</url>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>@project.version@</version>
+                <executions>
+                    <execution>
+                        <id>javadoc</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                        <phase>package</phase>
+                        <configuration>
+                            <skip>false</skip>
+                            <detectJavaApiLink>false</detectJavaApiLink>
+                            <detectOfflineLinks>false</detectOfflineLinks>
+                            <failOnWarnings>true</failOnWarnings>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/it/projects/MJAVADOC-642_cmdline/src/main/java/mjavadoc642/Main.java

@@ -0,0 +1,35 @@
+/*
+ * 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 mjavadoc642;
+
+/**
+ * This is the main class.
+ */
+public final class Main {
+    /**
+     * This is the main method.
+     *
+     * @param args The arguments
+     * @throws Exception if something goes wrong
+     */
+    public static final void main(String ... args) throws Exception {
+        System.out.println("Hello, World!");
+    }
+}

src/it/projects/MJAVADOC-642_cmdline/verify.groovy

@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+def log = new File( basedir, 'build.log').text
+
+assert log.count("[DEBUG]   (f) offline = false") == 0
+assert log.count("[DEBUG]   (f) offline = true") == 1

src/main/java/org/apache/maven/plugins/javadoc/AbstractJavadocMojo.java

@@ -333,10 +333,14 @@ public abstract class AbstractJavadocMojo extends AbstractMojo {
     private MojoExecution mojo;
 
     /**
-     * Specify if the Javadoc should operate in offline mode.
+     * Specify if the Javadoc plugin should operate in offline mode. If maven is run in offline
+     * mode (using {@code -o} or {@code --offline} on the command line), this option has no effect
+     * and the plugin is always in offline mode.
+     *
+     * @since 3.6.0
      */
-    @Parameter(defaultValue = "${settings.offline}", required = true, readonly = true)
-    private boolean isOffline;
+    @Parameter(property = "maven.javadoc.offline", defaultValue = "false")
+    private boolean offline;
 
     /**
      * Specifies the Javadoc resources directory to be included in the Javadoc (i.e. package.html, images...).
@@ -1033,7 +1037,9 @@ public abstract class AbstractJavadocMojo extends AbstractMojo {
      *
      * <b>Notes</b>:
      * <ol>
-     * <li>only used if {@code isOffline} is set to <code>false</code>.</li>
+     * <li>This option is ignored if the plugin is run in offline mode (using the {@code <offline>}
+     * setting or specifying {@code -o, --offline} or {@code -Dmaven.javadoc.offline=true} on the
+     * command line.</li>
      * <li>all given links should have a fetchable <code>/package-list</code> or <code>/element-list</code>
      * (since Java 10). For instance:
      * <pre>
@@ -3781,7 +3787,7 @@ private void addLinkArguments(List<String> arguments) throws MavenReportExceptio
                 continue;
             }
 
-            if (isOffline && !link.startsWith("file:")) {
+            if ((settings.isOffline() || offline) && !link.startsWith("file:")) {
                 continue;
             }
 

src/test/resources/unit/custom-configuration/custom-configuration-plugin-config.xml

@@ -98,7 +98,7 @@ under the License.
           <header>MAVEN JAVADOC PLUGIN TEST</header>
           <footer>MAVEN JAVADOC PLUGIN TEST FOOTER</footer>
           <locale>en_US</locale>
-          <isOffline>true</isOffline>
+          <offline>true</offline>
           <excludePackageNames>*.exclude2:custom.configuration.exclude1.*</excludePackageNames>
           <debug>true</debug>
           <failOnError>true</failOnError>