mbien commented on code in PR #4802:
URL: https://github.com/apache/netbeans/pull/4802#discussion_r998593317


##########
java/maven.hints/src/org/netbeans/modules/maven/hints/pom/UseReleaseOptionHint.java:
##########
@@ -0,0 +1,241 @@
+/*
+ * 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.netbeans.modules.maven.hints.pom;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.prefs.Preferences;
+import javax.swing.JComponent;
+import javax.xml.namespace.QName;
+import org.netbeans.api.project.Project;
+import org.netbeans.modules.editor.NbEditorUtilities;
+import org.netbeans.modules.maven.hints.pom.spi.Configuration;
+import org.netbeans.modules.maven.hints.pom.spi.POMErrorFixProvider;
+import org.netbeans.modules.maven.model.pom.Build;
+import org.netbeans.modules.maven.model.pom.POMComponent;
+import org.netbeans.modules.maven.model.pom.POMExtensibilityElement;
+import org.netbeans.modules.maven.model.pom.POMModel;
+import org.netbeans.modules.maven.model.pom.POMQName;
+import org.netbeans.modules.maven.model.pom.Plugin;
+import org.netbeans.modules.maven.model.pom.PluginExecution;
+import org.netbeans.modules.maven.model.pom.Properties;
+import org.netbeans.spi.editor.hints.ChangeInfo;
+import org.netbeans.spi.editor.hints.ErrorDescription;
+import org.netbeans.spi.editor.hints.ErrorDescriptionFactory;
+import org.netbeans.spi.editor.hints.Fix;
+import org.netbeans.spi.editor.hints.Severity;
+import org.openide.text.Line;
+import org.openide.util.NbBundle;
+
+import static org.netbeans.modules.maven.hints.pom.Bundle.*;
+
+/**
+ * Converts source/target javac options to the release option where possible 
(JEP 247).
+ * @author mbien
+ */
[email protected]({
+    "TIT_UseReleaseVersionHint=Convert matching source/target javac options to 
the release option.",
+    "DESC_UseReleaseVersionHint=Matching source/target options can be replaced 
with a single release option (JEP 247). This enforces API compatibility with 
the chosen Java release.",
+    "FIX_UseReleaseVersionHint=Convert to release option for strict 
compatibility checks."})
+public class UseReleaseOptionHint implements POMErrorFixProvider {
+
+    private static final String TARGET_TAG = "target";
+    private static final String SOURCE_TAG = "source";
+    private static final String RELEASE_TAG = "release";
+
+    private static final Configuration config = new 
Configuration(UseReleaseOptionHint.class.getName(),
+                TIT_UseReleaseVersionHint(), DESC_UseReleaseVersionHint(), 
true, Configuration.HintSeverity.WARNING);
+
+    @Override
+    public List<ErrorDescription> getErrorsForDocument(POMModel model, Project 
prj) {
+
+        List<ErrorDescription> hints = new ArrayList<>();
+
+        Build build = model.getProject().getBuild();
+        if (build != null) {
+            for (Plugin plugin : build.getPlugins()) {
+                if ("maven-compiler-plugin".equals(plugin.getArtifactId())) {
+                    if (!isPluginCompatible(plugin)) {
+                        return Collections.emptyList();
+                    }
+                    if (plugin.getConfiguration() != null) {
+                        hints.addAll(createHintsForParent("", 
plugin.getConfiguration()));
+                    }
+                    if (plugin.getExecutions() != null) {
+                        for (PluginExecution execution : 
plugin.getExecutions()) {
+                            if (execution.getConfiguration() != null) {
+                                hints.addAll(createHintsForParent("", 
execution.getConfiguration()));
+                            }
+                        }
+                    }
+                    break;
+                }
+            }
+        }
+
+        Properties properties = model.getProject().getProperties();
+        if (properties != null) {
+            hints.addAll(createHintsForParent("maven.compiler.", properties));
+        }
+
+        return hints;
+    }
+
+    private List<ErrorDescription> createHintsForParent(String prefix, 
POMComponent parent) {
+
+        int source;
+        int target;
+
+        // property name or an int value
+        String release = null;
+
+        try {
+            String sourceText = 
parent.getChildElementText(POMQName.createQName(prefix+SOURCE_TAG, true));
+            if (isProperty(sourceText)) {
+                release = sourceText;
+                sourceText = getProperty(sourceText, parent.getModel());
+            }
+
+            String targetText = 
parent.getChildElementText(POMQName.createQName(prefix+TARGET_TAG, true));
+            if (isProperty(targetText)) {
+                release = targetText;
+                targetText = getProperty(targetText, parent.getModel());
+            }
+
+            source = Integer.parseInt(sourceText);
+            target = Integer.parseInt(targetText);
+            if (release == null) {
+                release = String.valueOf(target);
+            }
+        } catch (NumberFormatException ignored) {
+            return Collections.emptyList();
+        }
+
+        if (source == target && source >= 9) {
+            List<ErrorDescription> hints = new ArrayList<>();
+            for (POMComponent prop : parent.getChildren()) {
+                String name = prop.getPeer().getNodeName();
+                if (name.equals(prefix+SOURCE_TAG) || 
name.equals(prefix+TARGET_TAG)) {
+                    hints.add(createHintForComponent(prefix, prop, 
parent.getModel(), release));

Review Comment:
   release replaces source/target in javac. You can't mix them up:
   ```
   javac -source 11 --release 11
   error: option --source cannot be used together with --release
   ```
   So I don't check if there is a release already there (the javac config would 
be already failing). It would ignore it right now and add another release 
element to the xml.



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