From 6b86301a9a8358f33e1a93ccb49ae6ddb192ada8 Mon Sep 17 00:00:00 2001
From: Jim Ma <ema@redhat.com>
Date: Tue, 9 Jul 2024 16:36:05 +0800
Subject: [PATCH] [#1726]:Fix ConcurrentModificationException in
 TypeInfoSetImpl#getXmlNs

---
 .../glassfish/jaxb/runtime/v2/model/impl/TypeInfoSetImpl.java  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/model/impl/TypeInfoSetImpl.java b/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/model/impl/TypeInfoSetImpl.java
index b1bbbcaab..8c45df938 100644
--- a/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/model/impl/TypeInfoSetImpl.java
+++ b/jaxb-ri/runtime/impl/src/main/java/org/glassfish/jaxb/runtime/v2/model/impl/TypeInfoSetImpl.java
@@ -10,6 +10,7 @@
 
 package org.glassfish.jaxb.runtime.v2.model.impl;
 
+import java.util.concurrent.ConcurrentHashMap;
 import org.glassfish.jaxb.core.v2.model.annotation.AnnotationReader;
 import org.glassfish.jaxb.core.v2.model.core.*;
 import org.glassfish.jaxb.core.v2.model.nav.Navigator;
@@ -287,7 +288,7 @@ public Iterable<? extends ElementInfoImpl<T,C,F,M>> getAllElements() {
     @Override
     public Map<String,String> getXmlNs(String namespaceUri) {
         if(xmlNsCache==null) {
-            xmlNsCache = new HashMap<>();
+            xmlNsCache = new ConcurrentHashMap<>();
 
             for (ClassInfoImpl<T, C, F, M> ci : beans().values()) {
                 XmlSchema xs = reader.getPackageAnnotation( XmlSchema.class, ci.getClazz(), null );