From 32467f0ca122e6e758711388a64b30137433d54b Mon Sep 17 00:00:00 2001
From: Tobias Brohl aka The_Minefighter <tobrohl@gmail.com>
Date: Mon, 14 Oct 2024 10:57:24 +0200
Subject: [PATCH] Fix issue #1819 incorrect enum value name generation with
 leading digits

The first character of an enum value name is checked whether it complies with isJavaIdentifierStart, if not an underscore prefix will be added to that name.
---
 .../com/sun/tools/xjc/reader/xmlschema/SimpleTypeBuilder.java   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/jaxb-ri/xjc/src/main/java/com/sun/tools/xjc/reader/xmlschema/SimpleTypeBuilder.java b/jaxb-ri/xjc/src/main/java/com/sun/tools/xjc/reader/xmlschema/SimpleTypeBuilder.java
index 47eb72161..2decb0beb 100644
--- a/jaxb-ri/xjc/src/main/java/com/sun/tools/xjc/reader/xmlschema/SimpleTypeBuilder.java
+++ b/jaxb-ri/xjc/src/main/java/com/sun/tools/xjc/reader/xmlschema/SimpleTypeBuilder.java
@@ -674,6 +674,8 @@ private List<CEnumConstant> buildCEnumConstants(XSRestrictionSimpleType type, bo
 
                 if(name==null) {
                     StringBuilder sb = new StringBuilder();
+                    if (factValue.length()>0 && !Character.isJavaIdentifierStart(facetValue.charAt(0)))
+                        sb.append('_'); //Otherwise enum constants starting with digits will be renamed to VALUE_x
                     for( int i=0; i<facetValue.length(); i++) {
                         char ch = facetValue.charAt(i);
                         if(Character.isJavaIdentifierPart(ch))