File 0001-Fix-a-ConcurrentModificationException-11429.patch of Package maven4

From f471d7940be6df851872c6506e9dfbdc346f3130 Mon Sep 17 00:00:00 2001
From: Martin Desruisseaux <martin.desruisseaux@geomatys.com>
Date: Mon, 10 Nov 2025 22:13:16 +0100
Subject: [PATCH 1/2] Fix a `ConcurrentModificationException` (#11429)

The exception was observed in the integration tests of Maven Compiler Plugin when Maven is executed with the `-T4` option.
---
 .../java/org/apache/maven/impl/DefaultDependencyResolver.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultDependencyResolver.java b/impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultDependencyResolver.java
index d29c3f369a..4e955f0901 100644
--- a/impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultDependencyResolver.java
+++ b/impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultDependencyResolver.java
@@ -21,11 +21,11 @@
 import java.io.IOException;
 import java.nio.file.Path;
 import java.util.Collection;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
@@ -85,7 +85,7 @@ public class DefaultDependencyResolver implements DependencyResolver {
      */
     public DefaultDependencyResolver() {
         // TODO: the cache should not be instantiated here, but should rather be session-wide.
-        moduleCaches = new HashMap<>();
+        moduleCaches = new ConcurrentHashMap<>();
     }
 
     /**
-- 
2.51.1