openrewrite · JohannisK · Jun 19, 2025 · Jun 19, 2025 · Jun 19, 2025 · Jun 19, 2025
diff --git a/rewrite-maven/src/main/java/org/openrewrite/maven/search/ModuleHasNoParent.java b/rewrite-maven/src/main/java/org/openrewrite/maven/search/ModuleHasNoParent.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2025 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.openrewrite.maven.search;
+
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+import org.jspecify.annotations.Nullable;
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.ScanningRecipe;
+import org.openrewrite.Tree;
+import org.openrewrite.TreeVisitor;
+import org.openrewrite.java.marker.JavaProject;
+import org.openrewrite.marker.SearchResult;
+
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
+
+@Value
+@EqualsAndHashCode(callSuper = false)
+public class ModuleHasNoParent extends ScanningRecipe<ModuleHasNoParent.Accumulator> {
+
+    @Override
+    public String getDisplayName() {
+        return "Module has no parent";
+    }
+
+    @Override
+    public String getDescription() {
+        return "Searches for Maven modules that have no parent. " +
+                "Places a `SearchResult` marker on all sources within a module that has no parent. " +
+                "This recipe is intended to be used as a precondition for other recipes. " +
+                "For example: " +
+                "this could be used to limit the application of recipes that add a parent to projects that currently don't have one.";
+    }
+
+    @Value
+    public static class Accumulator {
+        Set<JavaProject> projectsWithParent;
+    }
+
+    @Override
+    public Accumulator getInitialValue(ExecutionContext ctx) {
+        return new Accumulator(new HashSet<>());
+    }
+
+    @Override
+    public TreeVisitor<?, ExecutionContext> getScanner(Accumulator acc) {
+        return new TreeVisitor<Tree, ExecutionContext>() {
+            @Override
+            public Tree visit(@Nullable Tree tree, ExecutionContext ctx) {
+                assert tree != null;
+                tree.getMarkers()
+                        .findFirst(JavaProject.class)
+                        .ifPresent(jp -> {
+                            Tree t = new ParentPomInsight("*", "*", null, false).getVisitor().visit(tree, ctx);
+                            if (t != tree) {
+                                acc.getProjectsWithParent().add(jp);
+                            }
+                        });
+                return tree;
+            }
+        };
+    }
+
+    @Override
+    public TreeVisitor<?, ExecutionContext> getVisitor(Accumulator acc) {
+        return new TreeVisitor<Tree, ExecutionContext>() {
+            @Override
+            public Tree visit(@Nullable Tree tree, ExecutionContext ctx) {
+                assert tree != null;
+                Optional<JavaProject> maybeJp = tree.getMarkers().findFirst(JavaProject.class);
+                if (!maybeJp.isPresent()) {
+                    return tree;
+                }
+                JavaProject jp = maybeJp.get();
+                if (!acc.getProjectsWithParent().contains(jp)) {
+                    return SearchResult.found(tree, "Module has no parent.");
+                }
+                return tree;
+            }
+        };
+    }
+}
diff --git a/rewrite-maven/src/main/java/org/openrewrite/maven/search/ModuleHasPlugin.java b/rewrite-maven/src/main/java/org/openrewrite/maven/search/ModuleHasPlugin.java
@@ -42,7 +42,8 @@ public String getDescription() {
                "This recipe is intended to be used as a precondition for other recipes. " +
                "For example this could be used to limit the application of a spring boot migration to only projects " +
                "that apply the spring boot plugin, limiting unnecessary upgrading. " +
-               "If the search result you want is instead just the build.gradle(.kts) file applying the plugin, use the `FindPlugins` recipe instead.";
+               "If the search result you want is instead just the pom.xml file applying the plugin, " +
+               "use the `FindPlugins` recipe instead.";
     }
 
     @Option(displayName = "Group",