From 24c25aeae449deb58d4db3e5bccdfd0fdee00c5d Mon Sep 17 00:00:00 2001
From: Phillip Webb <phil.webb@broadcom.com>
Date: Wed, 17 Sep 2025 12:35:42 -0700
Subject: [PATCH] Tighten Checkstyle import-control rules for foundation layers

Update rules to ensure foundational layers don't depend on the
`org.springframework.boot` package.

Closes gh-47232
---
 config/checkstyle/import-control.xml | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/config/checkstyle/import-control.xml b/config/checkstyle/import-control.xml
index 86eaac0edc5..1916c8e4e54 100644
--- a/config/checkstyle/import-control.xml
+++ b/config/checkstyle/import-control.xml
@@ -14,15 +14,40 @@
 	<allow pkg=".*" regex="true" />
 
 	<!-- Keep foundation packages away from 'org.springframework.boot' package -->
+	<subpackage name="ansi">
+		<disallow pkg="org.springframework.boot" exact-match="true"/>
+	</subpackage>
+	<subpackage name="avilability">
+		<disallow pkg="org.springframework.boot" exact-match="true"/>
+	</subpackage>
 	<subpackage name="bootstrap">
 		<disallow pkg="org.springframework.boot" exact-match="true"/>
 	</subpackage>
+	<subpackage name="context">
+		<subpackage name="properties">
+			<subpackage name="bind">
+				<disallow pkg="org.springframework.boot" exact-match="true"/>
+			</subpackage>
+			<subpackage name="source">
+				<disallow pkg="org.springframework.boot" exact-match="true"/>
+			</subpackage>
+		</subpackage>
+	</subpackage>
 	<subpackage name="env">
 		<disallow pkg="org.springframework.boot" exact-match="true"/>
 	</subpackage>
+	<subpackage name="info">
+		<disallow pkg="org.springframework.boot" exact-match="true"/>
+	</subpackage>
+	<subpackage name="io">
+		<disallow pkg="org.springframework.boot" exact-match="true"/>
+	</subpackage>
 	<subpackage name="ssl">
 		<disallow pkg="org.springframework.boot" exact-match="true"/>
 	</subpackage>
+	<subpackage name="util">
+		<disallow pkg="org.springframework.boot" exact-match="true"/>
+	</subpackage>
 
 	<!-- Open direct use of micrometer to specific subpackages  -->
 	<subpackage name="metrics">