gnodet commented on code in PR #12651:
URL: https://github.com/apache/maven/pull/12651#discussion_r3690998340


##########
maven-core/src/main/java/org/apache/maven/plugin/internal/PluginDescriptorRequirementsValidator.java:
##########
@@ -0,0 +1,64 @@
+/*
+ * 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.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import 
org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
+import org.codehaus.plexus.configuration.PlexusConfiguration;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Verify that plugin descriptor does not contain Plexus Component 
requirements.
+ */

Review Comment:
   Nit: Other validators in this package include `@since` tags (e.g., 
`DeprecatedCoreExpressionValidator` has `@since 3.9.1`). Consider adding one 
here:
   
   ```suggestion
   /**
    * Verify that plugin descriptor does not contain Plexus Component 
requirements.
    *
    * @since 3.10.0
    */
   ```



##########
maven-core/src/main/java/org/apache/maven/plugin/internal/PluginDescriptorRequirementsValidator.java:
##########
@@ -0,0 +1,64 @@
+/*
+ * 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.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import 
org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
+import org.codehaus.plexus.configuration.PlexusConfiguration;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Verify that plugin descriptor does not contain Plexus Component 
requirements.
+ */
+@Singleton
+@Named
+class PluginDescriptorRequirementsValidator implements 
MavenPluginConfigurationValidator {
+
+    protected final PluginValidationManager pluginValidationManager;
+

Review Comment:
   Nit: This field is `protected` but `PluginDescriptorRequirementsValidator` 
is a concrete, package-private, final class with no subclasses. The `protected` 
visibility on the abstract base class makes sense (subclass access), but here 
`private` would be more appropriate.
   
   ```suggestion
       private final PluginValidationManager pluginValidationManager;
   ```



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