Begin converting this plugin to Guice constructor injection

* Prefer Guice injection

(cherry picked from commit c1c0a69)

Author: elharo

maven-plugin-plugin/pom.xml

@@ -130,6 +130,12 @@
       <artifactId>maven-resolver-util</artifactId>
       <version>${resolverVersion}</version>
     </dependency>
+    <dependency>
+      <groupId>javax.inject</groupId>
+      <artifactId>javax.inject</artifactId>
+      <version>1</version>
+      <scope>provided</scope>
+    </dependency>
 
     <!-- plexus -->
     <dependency>

maven-plugin-plugin/src/main/java/org/apache/maven/plugin/plugin/AbstractGeneratorMojo.java

@@ -23,7 +23,6 @@
 
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoExecutionException;
-import org.apache.maven.plugins.annotations.Component;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.project.MavenProject;
 
@@ -34,11 +33,6 @@
  *
  */
 public abstract class AbstractGeneratorMojo extends AbstractMojo {
-    /**
-     * The project currently being built.
-     */
-    @Component
-    protected MavenProject project;
 
     /**
      * The goal prefix that will appear before the ":".
@@ -67,6 +61,15 @@ public abstract class AbstractGeneratorMojo extends AbstractMojo {
      */
     protected static final String LS = System.lineSeparator();
 
+    /**
+     * The project currently being built.
+     */
+    protected final MavenProject project;
+
+    protected AbstractGeneratorMojo(MavenProject project) {
+        this.project = project;
+    }
+
     protected abstract void generate() throws MojoExecutionException;
 
     @Override

maven-plugin-plugin/src/main/java/org/apache/maven/plugin/plugin/DescriptorGeneratorMojo.java

@@ -18,6 +18,8 @@
  */
 package org.apache.maven.plugin.plugin;
 
+import javax.inject.Inject;
+
 import java.io.File;
 import java.net.URI;
 import java.util.Arrays;
@@ -38,6 +40,7 @@
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.apache.maven.project.MavenProject;
 import org.apache.maven.tools.plugin.DefaultPluginToolsRequest;
 import org.apache.maven.tools.plugin.ExtendedPluginDescriptor;
 import org.apache.maven.tools.plugin.PluginToolsRequest;
@@ -262,11 +265,16 @@ public class DescriptorGeneratorMojo extends AbstractGeneratorMojo {
     /**
      * The component used for scanning the source tree for mojos.
      */
-    @Component
-    private MojoScanner mojoScanner;
+    private final MojoScanner mojoScanner;
 
-    @Component
-    protected BuildContext buildContext;
+    protected final BuildContext buildContext;
+
+    @Inject
+    public DescriptorGeneratorMojo(MavenProject project, MojoScanner mojoScanner, BuildContext buildContext) {
+        super(project);
+        this.mojoScanner = mojoScanner;
+        this.buildContext = buildContext;
+    }
 
     public void generate() throws MojoExecutionException {
 

maven-plugin-plugin/src/main/java/org/apache/maven/plugin/plugin/HelpGeneratorMojo.java

@@ -18,18 +18,19 @@
  */
 package org.apache.maven.plugin.plugin;
 
+import javax.inject.Inject;
 import javax.lang.model.SourceVersion;
 
 import java.io.File;
 import java.util.Arrays;
 import java.util.stream.Collectors;
 
 import org.apache.maven.plugin.MojoExecutionException;
-import org.apache.maven.plugins.annotations.Component;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.apache.maven.project.MavenProject;
 import org.apache.maven.tools.plugin.generator.GeneratorException;
 import org.apache.maven.tools.plugin.generator.PluginHelpGenerator;
 import org.codehaus.plexus.util.StringUtils;
@@ -71,8 +72,13 @@ public class HelpGeneratorMojo extends AbstractGeneratorMojo {
     /**
      * Velocity component.
      */
-    @Component
-    private VelocityComponent velocity;
+    private final VelocityComponent velocity;
+
+    @Inject
+    public HelpGeneratorMojo(MavenProject project, VelocityComponent velocity) {
+        super(project);
+        this.velocity = velocity;
+    }
 
     String getHelpPackageName() {
         String packageName = null;

maven-plugin-plugin/src/test/java/org/apache/maven/plugin/plugin/HelpGeneratorMojoTest.java

@@ -40,8 +40,7 @@ public static Stream<Arguments> packageNameShouldBeCorrect() {
     @ParameterizedTest
     @MethodSource
     void packageNameShouldBeCorrect(MavenProject project, String expectedPackageName) {
-        HelpGeneratorMojo mojo = new HelpGeneratorMojo();
-        mojo.project = project;
+        HelpGeneratorMojo mojo = new HelpGeneratorMojo(project, null);
 
         String packageName = mojo.getHelpPackageName();
         assertEquals(expectedPackageName, packageName);