From fd37f0934f152ea26a4d9b5c97dd3db6db465e7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Sol=C3=B3rzano?= <jorsol@gmail.com>
Date: Thu, 7 Dec 2023 05:36:13 +0100
Subject: [PATCH] [MCOMPILER-333] Cleanup generated source files (#214)
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Signed-off-by: Jorge Solórzano <jorsol@gmail.com>
---
 .../maven/plugin/compiler/AbstractCompilerMojo.java | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java b/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java
index 298e5b7d..e9467651 100644
--- a/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java
+++ b/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java
@@ -30,6 +30,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -41,6 +42,7 @@
 import java.util.Properties;
 import java.util.Set;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.handler.ArtifactHandler;
@@ -1173,6 +1175,17 @@ public void execute() throws MojoExecutionException, CompilationFailureException
         if (useIncrementalCompilation) {
             incrementalBuildHelperRequest.outputDirectory(getOutputDirectory());
 
+            // Cleanup the generated source files created by annotation processing
+            // they are regenerated by the java compiler.
+            if (getGeneratedSourcesDirectory() != null) {
+                try (Stream<Path> walk =
+                        Files.walk(getGeneratedSourcesDirectory().toPath())) {
+                    walk.sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
+                } catch (IOException ex) {
+                    getLog().warn("I/O error deleting the annotation processing generated files: " + ex.getMessage());
+                }
+            }
+
             incrementalBuildHelper.beforeRebuildExecution(incrementalBuildHelperRequest);
 
             getLog().debug("incrementalBuildHelper#beforeRebuildExecution");