diff --git a/.gitea/workflows/qs.yml b/.gitea/workflows/qs.yml
index 43fcf81..637dd4f 100644
--- a/.gitea/workflows/qs.yml
+++ b/.gitea/workflows/qs.yml
@@ -4,7 +4,7 @@ on:
   - pull_request
 
 jobs:
-  oas:
+  test:
     name: "Gradle Check"
     runs-on: "ubuntu-latest"
     container:
@@ -25,4 +25,26 @@ jobs:
       - name: "Check"
         run: gradle check
       - name: "Stop Gradle"
-        run: gradle --stop
\ No newline at end of file
+        run: gradle --stop
+  checkstyle:
+    name: "Gradle Check"
+    runs-on: "ubuntu-latest"
+    container:
+      image: "cimg/openjdk:21.0-node"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: "Prepare Gradle"
+        run: gradle clean
+      - name: "Check"
+        run: gradle check
+      - name: "Stop Gradle"
+        run: gradle --stop
diff --git a/build.gradle.kts b/build.gradle.kts
index 3bc0350..6306cff 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -2,6 +2,24 @@ plugins {
     java
     id("org.springframework.boot") version "3.3.4"
     id("io.spring.dependency-management") version "1.1.6"
+    id("checkstyle")
+}
+
+tasks.withType<Checkstyle> {
+    reports {
+        xml.required.set(false)
+        html.required.set(true)
+    }
+}
+
+tasks.withType<Checkstyle> {
+    reports {
+        // Disable HTML report
+        html.required.set(false)
+
+        // Disable XML report
+        xml.required.set(false)
+    }
 }
 
 group = "de.szut"
diff --git a/config/checkstyle/checkstyle-ignore.xml b/config/checkstyle/checkstyle-ignore.xml
new file mode 100644
index 0000000..fe3b2fe
--- /dev/null
+++ b/config/checkstyle/checkstyle-ignore.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<!DOCTYPE suppressions PUBLIC
+        "-//Puppy Crawl//DTD Suppressions 1.2//EN"
+        "https://checkstyle.org/dtds/suppressions_1_2.dtd"
+        >
+
+<suppressions>
+    <suppress files="[\\/]de[\\/]hmmh[\\/]pmt[\\/]oas" checks="."/>
+</suppressions>
diff --git a/config/checkstyle/checkstyle.xml b/config/checkstyle/checkstyle.xml
new file mode 100644
index 0000000..d8f0701
--- /dev/null
+++ b/config/checkstyle/checkstyle.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+        "https://checkstyle.org/dtds/configuration_1_3.dtd"
+        >
+<module name="Checker">
+    <module name="SuppressionFilter">
+        <property name="file" value="${config_loc}/checkstyle-ignore.xml"/>
+    </module>
+
+    <property name="severity" value="error"/>
+    <property name="tabWidth" value="4"/>
+
+    <module name="LineLength">
+        <property name="max" value="500"/>
+    </module>
+    <module name="FileTabCharacter">
+        <property name="eachLine" value="true"/>
+    </module>
+
+    <module name="NewlineAtEndOfFile"/>
+
+</module>
diff --git a/src/main/java/de/szut/lf8_starter/config/OpenAPIConfiguration.java b/src/main/java/de/szut/lf8_starter/config/OpenAPIConfiguration.java
index 0501902..1b2282b 100644
--- a/src/main/java/de/szut/lf8_starter/config/OpenAPIConfiguration.java
+++ b/src/main/java/de/szut/lf8_starter/config/OpenAPIConfiguration.java
@@ -57,4 +57,4 @@ public class OpenAPIConfiguration {
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java b/src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java
index 3cc82f7..8555ef9 100644
--- a/src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java
+++ b/src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java
@@ -46,4 +46,4 @@ public class KeycloakLogoutHandler implements LogoutHandler {
         }
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/de/szut/lf8_starter/security/KeycloakSecurityConfig.java b/src/main/java/de/szut/lf8_starter/security/KeycloakSecurityConfig.java
index d47d6ec..ea9e354 100644
--- a/src/main/java/de/szut/lf8_starter/security/KeycloakSecurityConfig.java
+++ b/src/main/java/de/szut/lf8_starter/security/KeycloakSecurityConfig.java
@@ -94,4 +94,4 @@ class KeycloakSecurityConfig {
         });
         return jwtAuthenticationConverter;
     }
-}
\ No newline at end of file
+}