From 6a79820d2dfa38b2e812bf65878d51a1654fa42b Mon Sep 17 00:00:00 2001
From: Vladimir Valekzhanin <valdemarcheck@yandex.ru>
Date: Sun, 4 Oct 2026 13:45:10 +0300
Subject: [PATCH 1/5] feat: create check-lint job

---
 .github/workflows/workflow.yml | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2742724..d0bc368 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -35,4 +35,16 @@ jobs:
       - name: Set up JDK
         uses: ./.github/actions/setup-jdk
       - name: Check formatting
-        run: mvn -B spotless:check --file pom.xml
\ No newline at end of file
+        run: mvn -B spotless:check --file pom.xml
+
+  check-lint:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v5
+      - name: Set up JDK
+        uses: ./.github/actions/setup-jdk
+      - name: Check lint
+        run: mvn -B checkstyle:check --file pom.xml
\ No newline at end of file

From 36c852175c1aa6910e5a0f52a02c80476abfc0e3 Mon Sep 17 00:00:00 2001
From: Vladimir Valekzhanin <valdemarcheck@yandex.ru>
Date: Sun, 4 Oct 2026 13:48:47 +0300
Subject: [PATCH 2/5] feat: write checkstyle.xml

---
 checkstyle.xml | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 checkstyle.xml

diff --git a/checkstyle.xml b/checkstyle.xml
new file mode 100644
index 0000000..9090167
--- /dev/null
+++ b/checkstyle.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+  "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+  "https://checkstyle.org/dtds/configuration_1_3.dtd">
+<module name="Checker">
+  <module name="TreeWalker">
+    <module name="UnusedImports"/>
+    <module name="RedundantImport"/>
+    <module name="EqualsHashCode"/>
+  </module>
+</module>
\ No newline at end of file

From b08969ae3f6f26416e1f3f5f68f6e929394feda0 Mon Sep 17 00:00:00 2001
From: Vladimir Valekzhanin <valdemarcheck@yandex.ru>
Date: Sun, 4 Oct 2026 13:48:57 +0300
Subject: [PATCH 3/5] feat: add checkstyle plugin

---
 pom.xml | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/pom.xml b/pom.xml
index d1e244a..66d3ed7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -197,6 +197,24 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.6.0</version>
+                <configuration>
+                    <configLocation>checkstyle.xml</configLocation>
+                    <consoleOutput>true</consoleOutput>
+                    <failOnViolation>true</failOnViolation>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
-</project>
+</project>
\ No newline at end of file

From a388814e2c9fe306b8bedeed9cc1d4cb766e7668 Mon Sep 17 00:00:00 2001
From: Vladimir Valekzhanin <valdemarcheck@yandex.ru>
Date: Sun, 4 Oct 2026 13:51:43 +0300
Subject: [PATCH 4/5] chore: rename check-lint to lint

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

diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index d0bc368..0dbfbce 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -37,7 +37,7 @@ jobs:
       - name: Check formatting
         run: mvn -B spotless:check --file pom.xml
 
-  check-lint:
+  lint:
     needs: build
     runs-on: ubuntu-latest
     permissions:

From e6b437af999777adfacbf20e649a9e9a7dfec9bd Mon Sep 17 00:00:00 2001
From: Vladimir Valekzhanin <valdemarcheck@yandex.ru>
Date: Sun, 4 Oct 2026 14:09:21 +0300
Subject: [PATCH 5/5] chore: update action versions

---
 .github/actions/setup-jdk/action.yml | 2 +-
 .github/workflows/workflow.yml       | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/actions/setup-jdk/action.yml b/.github/actions/setup-jdk/action.yml
index 209dfce..62bc4ff 100644
--- a/.github/actions/setup-jdk/action.yml
+++ b/.github/actions/setup-jdk/action.yml
@@ -5,7 +5,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up JDK 25
-      uses: actions/setup-java@v5
+      uses: actions/setup-java@v6
       with:
         java-version: '25'
         distribution: 'temurin'
diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 0dbfbce..0b97cfd 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -13,7 +13,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v7
     - name: Set up JDK
       uses: ./.github/actions/setup-jdk
     - name: Build with Maven
@@ -31,7 +31,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
       - name: Set up JDK
         uses: ./.github/actions/setup-jdk
       - name: Check formatting
@@ -43,7 +43,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
       - name: Set up JDK
         uses: ./.github/actions/setup-jdk
       - name: Check lint