From 3281b51e76396bc2977d2b23125e1b4f2a4c12f8 Mon Sep 17 00:00:00 2001
From: mewilker <mewilk@byu.edu>
Date: Tue, 9 Jun 2026 17:53:50 -0600
Subject: [PATCH 1/3] update compiler version and checkstyle version

---
 pom.xml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pom.xml b/pom.xml
index 4dbc741..9f28b3b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,15 +8,15 @@
 	<version>1.0.9</version>
 	<name>C S 240 Checkstyle Checks</name>
 	<properties>
-		<maven.compiler.source>21</maven.compiler.source>
-		<maven.compiler.target>21</maven.compiler.target>
+		<maven.compiler.source>23</maven.compiler.source>
+		<maven.compiler.target>23</maven.compiler.target>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<dependencies>
 		<dependency>
 			<groupId>com.puppycrawl.tools</groupId>
 			<artifactId>checkstyle</artifactId>
-			<version>10.14.1</version>
+			<version>13.5.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>

From 5ee48e1c73e4e4b0ed8629c0160f28cf91f5b376 Mon Sep 17 00:00:00 2001
From: mewilker <mewilk@byu.edu>
Date: Tue, 9 Jun 2026 17:54:30 -0600
Subject: [PATCH 2/3] Allow applicable variables to go unnamed

---
 src/main/resources/cs240_checks.xml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/main/resources/cs240_checks.xml b/src/main/resources/cs240_checks.xml
index 4b1df99..e62b879 100644
--- a/src/main/resources/cs240_checks.xml
+++ b/src/main/resources/cs240_checks.xml
@@ -41,17 +41,17 @@
                      value="Parameter name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>
         <module name="LambdaParameterName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="format" value="^[a-z][a-zA-Z0-9]*|_$"/>
             <message key="name.invalidPattern"
                      value="Lambda parameter name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>
         <module name="CatchParameterName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="format" value="^[a-z][a-zA-Z0-9]*|_$"/>
             <message key="name.invalidPattern"
                      value="Catch parameter name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>
         <module name="LocalVariableName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="format" value="^[a-z][a-zA-Z0-9]*|_$"/>
             <message key="name.invalidPattern"
                      value="Local variable name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>
@@ -61,7 +61,7 @@
                      value="Local variable name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>
         <module name="PatternVariableName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+            <property name="format" value="^[a-z][a-zA-Z0-9]*|_$"/>
             <message key="name.invalidPattern"
                      value="Pattern variable name ''{0}'' must match pattern ''{1}'' (lowerCamelCase)."/>
         </module>

From 1af5508e7b939c27da381429225634c926a427db Mon Sep 17 00:00:00 2001
From: mewilker <mewilk@byu.edu>
Date: Tue, 9 Jun 2026 18:37:04 -0600
Subject: [PATCH 3/3] update workflow jdk to 23

---
 .github/workflows/tests.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9b748c9..42f7e74 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,7 +28,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'corretto'
-          java-version: '21'
+          java-version: '23'
 
       - name: Test with Maven
         run: mvn test