first

.gitignore

@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

GetBearerToken.http

@@ -0,0 +1,6 @@
+POST https://keycloak.szut.dev/auth/realms/szut/protocol/openid-connect/token
+Content-Type: application/x-www-form-urlencoded
+
+grant_type=password&client_id=employee-management-service&username=user&password=test
+
+

Readme.md

@@ -0,0 +1,61 @@
+# Starter für das LF08 Projekt
+
+Erstellen Sie einen Fork dieses Projektes auf Github. Wählen Sie einen Namen und passen Sie diesen auch in der pom.xml in Zeile 12, 14 und 15 an.
+
+## Requirements
+* Docker https://docs.docker.com/get-docker/
+* Docker compose (bei Windows und Mac schon in Docker enthalten) https://docs.docker.com/compose/install/
+
+## Endpunkt
+```
+http://localhost:8089
+```
+## Swagger
+```
+http://localhost:8089/swagger
+```
+
+
+# Postgres
+### Terminal öffnen
+für alles gilt, im Terminal im Ordner docker/local sein
+```bash
+cd docker/local
+```
+### Postgres starten
+```bash
+docker compose up
+```
+Achtung: Der Docker-Container läuft dauerhaft! Wenn er nicht mehr benötigt wird, sollten Sie ihn stoppen.
+
+### Postgres stoppen
+```bash
+docker compose down
+```
+
+### Postgres Datenbank wipen, z.B. bei Problemen
+```bash
+docker compose down
+docker volume rm local_lf8_starter_postgres_data
+docker compose up
+```
+
+### Intellij-Ansicht für Postgres Datenbank einrichten
+```bash
+1. Lasse den Docker-Container mit der PostgreSQL-Datenbank laufen
+2. im Ordner resources die Datei application.properties öffnen und die URL der Datenbank kopieren
+3. rechts im Fenster den Reiter Database öffnen
+4. In der Database-Symbolleiste auf das Datenbanksymbol mit dem Schlüssel klicken
+5. auf das Pluszeichen klicken
+6. Datasource from URL auswählen
+7. URL der DB einfügen und PostgreSQL-Treiber auswählen, mit OK bestätigen
+8. Username lf8_starter und Passwort secret eintragen (siehe application.properties), mit Apply bestätigen
+9. im Reiter Schemas alle Häkchen entfernen und lediglich vor lf8_starter_db und public Häkchen setzen
+10. mit Apply und ok bestätigen 
+```
+# Keycloak
+
+### Keycloak Token
+1. Auf der Projektebene [GetBearerToken.http](GetBearerToken.http) öffnen.
+2. Neben der Request auf den grünen Pfeil drücken
+3. Aus dem Reponse das access_token kopieren

SampleRequests.http

@@ -0,0 +1,21 @@
+@token = eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICIzUFQ0dldiNno5MnlQWk1EWnBqT1U0RjFVN0lwNi1ELUlqQWVGczJPbGU0In0.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.Wl9t2UazAimPxcNByMyY0Zl2oI_ScVtehQ0iglpTNPBr9me1xf2ky0nUgVOP04H-TWAuQJQctVMP_Yi3YPDTxm7PXeQ_lj9JyK6nCDpb5gz5VIMNCYcLjWLz6R1pfbjZGkeID6oYTXSsoZSy6arof-rMG1phjnIdiXDwF4lFgOgqUoxbv58mvs73DUTKZjIEaw-N7A_ZQrC35JX6CaKUlnsaGepa2LQ-Pz6Smg1JipxOwjlH4TEBsBjifMjkedzfPm2NfwEy1qUHMLtLMLukIVH3iaSUVJ3hEZe6606ne1qwumT6Lnm3PAXSbF2Hxap89nbmG08EOlGx5VwMylEAVg
+###
+GET localhost:8080/welcome
+
+###
+GET localhost:8080/roles
+Authorization: Bearer {{token}}
+
+###
+GET localhost:8080/hello
+Authorization: Bearer {{token}}
+
+###
+POST localhost:8080/hello
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+{
+    "message": "test"
+}
+

build.gradle.kts

@@ -0,0 +1,47 @@
+plugins {
+    java
+    id("org.springframework.boot") version "3.3.3"
+    id("io.spring.dependency-management") version "1.1.6"
+}
+
+group = "de.szut"
+version = "0.0.1-SNAPSHOT"
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(22)
+    }
+}
+
+configurations {
+    compileOnly {
+        extendsFrom(configurations.annotationProcessor.get())
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    compileOnly("org.projectlombok:lombok")
+    annotationProcessor("org.projectlombok:lombok")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server:3.3.3")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-client:3.3.3")
+    runtimeOnly("org.postgresql:postgresql")
+    //implementation("org.springdoc:springdoc-openapi-ui:1.8.0")
+    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.6.0")
+
+
+
+
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}

docker/local/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+volumes:
+  lf8_starter_postgres_data:
+    driver: local
+
+services:
+  postgres_for_lf8_starter:
+    container_name: lf8_starter_postgres_container
+    image: postgres:16.4
+    volumes:
+      - lf8_starter_postgres_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: lf8_starter_db
+      POSTGRES_USER: lf8_starter
+      POSTGRES_PASSWORD: secret
+    ports:
+      - "5432:5432"

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "lf8_starter"

src/main/java/de/szut/lf8_starter/Lf8StarterApplication.java

@@ -0,0 +1,13 @@
+package de.szut.lf8_starter;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Lf8StarterApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Lf8StarterApplication.class, args);
+    }
+
+}

src/main/java/de/szut/lf8_starter/config/OpenAPIConfiguration.java

@@ -0,0 +1,60 @@
+package de.szut.lf8_starter.config;
+
+
+
+import io.swagger.v3.oas.models.Components;
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.info.Info;
+import io.swagger.v3.oas.models.security.SecurityRequirement;
+import io.swagger.v3.oas.models.security.SecurityScheme;
+import io.swagger.v3.oas.models.servers.Server;
+import jakarta.servlet.ServletContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+
+@Configuration
+public class OpenAPIConfiguration {
+
+    private ServletContext context;
+
+    public OpenAPIConfiguration(ServletContext context) {
+        this.context = context;
+    }
+
+
+    @Bean
+    public OpenAPI springShopOpenAPI(
+            //  @Value("${info.app.version}") String appVersion,
+    ) {
+        final String securitySchemeName = "bearerAuth";
+
+        return new OpenAPI()
+                .addServersItem(new Server().url(this.context.getContextPath()))
+                .info(new Info()
+                        .title("LF8 project starter")
+                        .description("\n## Auth\n" +
+                                "\n## Authentication\n" + "\nThis Hello service uses JWTs to authenticate requests. You will receive a bearer token by making a POST-Request in IntelliJ on:\n\n" +
+                                "\n" +
+                                "```\nPOST http://keycloak.szut.dev/auth/realms/szut/protocol/openid-connect/token\nContent-Type: application/x-www-form-urlencoded\ngrant_type=password&client_id=employee-management-service&username=user&password=test\n```\n" +
+                                "\n" +
+                                "\nor by CURL\n" +
+                                "```\ncurl -X POST 'http://keycloak.szut.dev/auth/realms/szut/protocol/openid-connect/token'\n--header 'Content-Type: application/x-www-form-urlencoded'\n--data-urlencode 'grant_type=password'\n--data-urlencode 'client_id=employee-management-service'\n--data-urlencode 'username=user'\n--data-urlencode 'password=test'\n```\n" +
+                                "\nTo get a bearer-token in Postman, you have to follow the instructions in \n [Postman-Documentation](https://documenter.getpostman.com/view/7294517/SzmfZHnd).")
+
+                        .version("0.1"))
+                .addSecurityItem(new SecurityRequirement().addList(securitySchemeName))
+                .components(
+                        new Components()
+                                .addSecuritySchemes(securitySchemeName,
+                                        new SecurityScheme()
+                                                .name(securitySchemeName)
+                                                .type(SecurityScheme.Type.HTTP)
+                                                .scheme("bearer")
+                                                .bearerFormat("JWT")
+                                )
+                );
+    }
+
+
+}

src/main/java/de/szut/lf8_starter/config/SampleDataCreator.java

@@ -0,0 +1,33 @@
+package de.szut.lf8_starter.config;
+
+
+import de.szut.lf8_starter.hello.HelloEntity;
+import de.szut.lf8_starter.hello.HelloRepository;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+
+@Component
+public class SampleDataCreator implements ApplicationRunner {
+
+    private HelloRepository repository;
+
+    public SampleDataCreator(HelloRepository repository) {
+        this.repository = repository;
+    }
+
+    public void run(ApplicationArguments args) {
+        repository.save(new HelloEntity("Hallo Welt!"));
+        repository.save(new HelloEntity("Schöner Tag heute"));
+        repository.save(new HelloEntity("FooBar"));
+
+    }
+
+    @Bean
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+
+}

src/main/java/de/szut/lf8_starter/exceptionHandling/ErrorDetails.java

@@ -0,0 +1,14 @@
+package de.szut.lf8_starter.exceptionHandling;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+import java.util.Date;
+
+@Data
+@AllArgsConstructor
+public class ErrorDetails {
+    private Date timestamp;
+    private String message;
+    private String details;
+}

src/main/java/de/szut/lf8_starter/exceptionHandling/GlobalExceptionHandler.java

@@ -0,0 +1,28 @@
+package de.szut.lf8_starter.exceptionHandling;
+
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.Date;
+
+@ControllerAdvice
+@ApiResponses(value = {
+        @ApiResponse(responseCode = "500", description = "invalid JSON posted",
+                content = @Content)
+})
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<?> handleHelloEntityNotFoundException(ResourceNotFoundException ex, WebRequest request) {
+        ErrorDetails errorDetails = new ErrorDetails(new Date(), ex.getMessage(), request.getDescription(false));
+        return new ResponseEntity<>(errorDetails, HttpStatus.NOT_FOUND);
+    }
+
+
+}

src/main/java/de/szut/lf8_starter/exceptionHandling/ResourceNotFoundException.java

@@ -0,0 +1,11 @@
+package de.szut.lf8_starter.exceptionHandling;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.NOT_FOUND)
+public class ResourceNotFoundException extends RuntimeException {
+    public ResourceNotFoundException(String message) {
+        super(message);
+    }
+}

src/main/java/de/szut/lf8_starter/hello/HelloController.java

@@ -0,0 +1,99 @@
+package de.szut.lf8_starter.hello;
+
+
+import de.szut.lf8_starter.exceptionHandling.ResourceNotFoundException;
+import de.szut.lf8_starter.hello.dto.HelloCreateDto;
+import de.szut.lf8_starter.hello.dto.HelloGetDto;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import jakarta.validation.Valid;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping(value = "hello")
+@PreAuthorize("hasAnyAuthority('user')")
+public class HelloController {
+    private final HelloService service;
+    private final HelloMapper helloMapper;
+
+    public HelloController(HelloService service, HelloMapper mappingService) {
+        this.service = service;
+        this.helloMapper = mappingService;
+    }
+
+    @Operation(summary = "creates a new hello with its id and message")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "201", description = "created hello",
+                    content = {@Content(mediaType = "application/json",
+                            schema = @Schema(implementation = HelloGetDto.class))}),
+            @ApiResponse(responseCode = "400", description = "invalid JSON posted",
+                    content = @Content),
+            @ApiResponse(responseCode = "401", description = "not authorized",
+                    content = @Content)})
+    @PostMapping
+    public HelloGetDto create(@RequestBody @Valid HelloCreateDto helloCreateDto) {
+        HelloEntity helloEntity = this.helloMapper.mapCreateDtoToEntity(helloCreateDto);
+        helloEntity = this.service.create(helloEntity);
+        return this.helloMapper.mapToGetDto(helloEntity);
+    }
+
+    @Operation(summary = "delivers a list of hellos")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "200", description = "list of hellos",
+                    content = {@Content(mediaType = "application/json",
+                            schema = @Schema(implementation = HelloGetDto.class))}),
+            @ApiResponse(responseCode = "401", description = "not authorized",
+                    content = @Content)})
+    @GetMapping
+    public List<HelloGetDto> findAll() {
+        return this.service
+                .readAll()
+                .stream()
+                .map(e -> this.helloMapper.mapToGetDto(e))
+                .collect(Collectors.toList());
+    }
+
+    @Operation(summary = "deletes a Hello by id")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "204", description = "delete successful"),
+            @ApiResponse(responseCode = "401", description = "not authorized",
+                    content = @Content),
+            @ApiResponse(responseCode = "404", description = "resource not found",
+                    content = @Content)})
+    @DeleteMapping("/{id}")
+    @ResponseStatus(code = HttpStatus.NO_CONTENT)
+    public void deleteHelloById(@PathVariable long id) {
+        var entity = this.service.readById(id);
+        if (entity == null) {
+            throw new ResourceNotFoundException("HelloEntity not found on id = " + id);
+        } else {
+            this.service.delete(entity);
+        }
+    }
+
+    @Operation(summary = "find hellos by message")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "200", description = "List of hellos who have the given message",
+                    content = {@Content(mediaType = "application/json",
+                            schema = @Schema(implementation = HelloGetDto.class))}),
+            @ApiResponse(responseCode = "404", description = "qualification description does not exist",
+                    content = @Content),
+            @ApiResponse(responseCode = "401", description = "not authorized",
+                    content = @Content)})
+    @GetMapping("/findByMessage")
+    public List<HelloGetDto> findAllEmployeesByQualification(@RequestParam String message) {
+        return this.service
+                .findByMessage(message)
+                .stream()
+                .map(e -> this.helloMapper.mapToGetDto(e))
+                .collect(Collectors.toList());
+    }
+}

src/main/java/de/szut/lf8_starter/hello/HelloEntity.java

@@ -0,0 +1,27 @@
+package de.szut.lf8_starter.hello;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@NoArgsConstructor
+@AllArgsConstructor
+@Getter
+@Setter
+@Entity
+@Table(name = "hello")
+public class HelloEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    private String message;
+
+    public HelloEntity(String message) {
+        this.message = message;
+    }
+}
+

src/main/java/de/szut/lf8_starter/hello/HelloMapper.java

@@ -0,0 +1,20 @@
+package de.szut.lf8_starter.hello;
+
+
+import de.szut.lf8_starter.hello.dto.HelloCreateDto;
+import de.szut.lf8_starter.hello.dto.HelloGetDto;
+import org.springframework.stereotype.Service;
+
+@Service
+public class HelloMapper {
+
+    public HelloGetDto mapToGetDto(HelloEntity entity) {
+        return new HelloGetDto(entity.getId(), entity.getMessage());
+    }
+
+    public HelloEntity mapCreateDtoToEntity(HelloCreateDto dto) {
+        var entity = new HelloEntity();
+        entity.setMessage(dto.getMessage());
+        return entity;
+    }
+}

src/main/java/de/szut/lf8_starter/hello/HelloRepository.java

@@ -0,0 +1,12 @@
+package de.szut.lf8_starter.hello;
+
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface HelloRepository extends JpaRepository<HelloEntity, Long> {
+
+
+    List<HelloEntity> findByMessage(String message);
+}

src/main/java/de/szut/lf8_starter/hello/HelloService.java

@@ -0,0 +1,40 @@
+package de.szut.lf8_starter.hello;
+
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class HelloService {
+    private final HelloRepository repository;
+
+    public HelloService(HelloRepository repository) {
+        this.repository = repository;
+    }
+
+    public HelloEntity create(HelloEntity entity) {
+        return this.repository.save(entity);
+    }
+
+    public List<HelloEntity> readAll() {
+        return this.repository.findAll();
+    }
+
+    public HelloEntity readById(long id) {
+        Optional<HelloEntity> optionalQualification = this.repository.findById(id);
+        if (optionalQualification.isEmpty()) {
+            return null;
+        }
+        return optionalQualification.get();
+    }
+
+
+    public void delete(HelloEntity entity) {
+        this.repository.delete(entity);
+    }
+
+    public List<HelloEntity> findByMessage(String message) {
+        return this.repository.findByMessage(message);
+    }
+}

src/main/java/de/szut/lf8_starter/hello/dto/HelloCreateDto.java

@@ -0,0 +1,20 @@
+package de.szut.lf8_starter.hello.dto;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import jakarta.validation.constraints.Size;
+import lombok.Getter;
+import lombok.Setter;
+
+
+@Getter
+@Setter
+public class HelloCreateDto {
+
+    @Size(min = 3, message = "at least length of 3")
+    private String message;
+
+    @JsonCreator
+    public HelloCreateDto(String message) {
+        this.message = message;
+    }
+}

src/main/java/de/szut/lf8_starter/hello/dto/HelloGetDto.java

@@ -0,0 +1,17 @@
+package de.szut.lf8_starter.hello.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@AllArgsConstructor
+@Getter
+@Setter
+public class HelloGetDto {
+
+    private long id;
+
+    private String message;
+
+}
+

src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java

@@ -0,0 +1,49 @@
+package de.szut.lf8_starter.security;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.oauth2.core.oidc.user.OidcUser;
+import org.springframework.security.web.authentication.logout.LogoutHandler;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+@Slf4j
+@Component
+public class KeycloakLogoutHandler implements LogoutHandler {
+
+
+    private final RestTemplate restTemplate;
+
+    public KeycloakLogoutHandler(RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+    }
+
+    @Override
+    public void logout(HttpServletRequest request, HttpServletResponse response, Authentication auth) {
+        logout(request, auth);
+    }
+
+    public void logout(HttpServletRequest request, Authentication auth) {
+        logoutFromKeycloak((OidcUser) auth.getPrincipal());
+    }
+
+    private void logoutFromKeycloak(OidcUser user) {
+        String endSessionEndpoint = user.getIssuer() + "/protocol/openid-connect/logout";
+        UriComponentsBuilder builder = UriComponentsBuilder
+                .fromUriString(endSessionEndpoint)
+                .queryParam("id_token_hint", user.getIdToken().getTokenValue());
+
+        ResponseEntity<String> logoutResponse = restTemplate.getForEntity(builder.toUriString(), String.class);
+        if (logoutResponse.getStatusCode().is2xxSuccessful()) {
+            log.info("Successfulley logged out from Keycloak");
+        } else {
+            log.error("Could not propagate logout to Keycloak");
+        }
+    }
+
+}

src/main/java/de/szut/lf8_starter/security/KeycloakSecurityConfig.java

@@ -0,0 +1,97 @@
+package de.szut.lf8_starter.security;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpMethod;
+import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.authority.mapping.GrantedAuthoritiesMapper;
+import org.springframework.security.core.session.SessionRegistry;
+import org.springframework.security.core.session.SessionRegistryImpl;
+import org.springframework.security.oauth2.core.oidc.user.OidcUserAuthority;
+import org.springframework.security.oauth2.core.user.OAuth2UserAuthority;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter;
+import org.springframework.security.oauth2.server.resource.authentication.JwtGrantedAuthoritiesConverter;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.session.RegisterSessionAuthenticationStrategy;
+import org.springframework.security.web.authentication.session.SessionAuthenticationStrategy;
+import org.springframework.security.web.session.HttpSessionEventPublisher;
+import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
+
+@Configuration
+@EnableWebSecurity
+class KeycloakSecurityConfig {
+
+    private static final String GROUPS = "groups";
+    private static final String REALM_ACCESS_CLAIM = "realm_access";
+    private static final String ROLES_CLAIM = "roles";
+
+    private final KeycloakLogoutHandler keycloakLogoutHandler;
+
+    KeycloakSecurityConfig(KeycloakLogoutHandler keycloakLogoutHandler) {
+        this.keycloakLogoutHandler = keycloakLogoutHandler;
+    }
+
+    @Bean
+    public SessionRegistry sessionRegistry() {
+        return new SessionRegistryImpl();
+    }
+
+    @Bean
+    protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
+        return new RegisterSessionAuthenticationStrategy(sessionRegistry());
+    }
+
+    @Bean
+    public HttpSessionEventPublisher httpSessionEventPublisher() {
+        return new HttpSessionEventPublisher();
+    }
+
+
+    @Bean
+    public SecurityFilterChain resourceServerFilterChain(HttpSecurity http) throws Exception {
+
+        http.authorizeHttpRequests(auth -> auth
+                .requestMatchers(new AntPathRequestMatcher("/welcome"))
+                .permitAll()
+                .requestMatchers(
+                        new AntPathRequestMatcher("/swagger"),
+                        new AntPathRequestMatcher("/swagger-ui/**"),
+                        new AntPathRequestMatcher("/v3/api-docs/**"))
+                .permitAll()
+                .requestMatchers(new AntPathRequestMatcher("/hello/**"))
+                .hasRole("user")
+                .requestMatchers(new AntPathRequestMatcher("/roles"))
+                .authenticated()
+                .requestMatchers(new AntPathRequestMatcher("/"))
+                .permitAll()
+                .anyRequest()
+                .authenticated()).oauth2ResourceServer(spec -> spec.jwt(Customizer.withDefaults()));
+        return http.build();
+    }
+
+    @Bean
+    public JwtAuthenticationConverter jwtAuthenticationConverter() {
+        JwtAuthenticationConverter jwtAuthenticationConverter = new JwtAuthenticationConverter();
+        jwtAuthenticationConverter.setJwtGrantedAuthoritiesConverter(jwt -> {
+            List<GrantedAuthority> grantedAuthorities = new ArrayList<>();
+
+            Map<String, Object> realmAccess = jwt.getClaim("realm_access");
+            if (realmAccess != null && realmAccess.containsKey("roles")) {
+                List<String> roles = (List<String>) realmAccess.get("roles");
+                for (String role : roles) {
+                    grantedAuthorities.add(new SimpleGrantedAuthority("ROLE_" + role));
+                }
+            }
+
+            return grantedAuthorities;
+        });
+        return jwtAuthenticationConverter;
+    }
+}

src/main/java/de/szut/lf8_starter/welcome/WelcomeController.java

@@ -0,0 +1,27 @@
+package de.szut.lf8_starter.welcome;
+
+
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.security.Principal;
+
+@RestController
+public class WelcomeController {
+
+    @GetMapping("/welcome")
+    public String welcome() {
+        return "welcome to lf8_starter";
+    }
+
+    @GetMapping("/roles")
+    public ResponseEntity<?> getRoles(Authentication authentication) {
+        return ResponseEntity.ok(authentication.getAuthorities());
+    }
+
+
+}

src/main/resources/application.properties

@@ -0,0 +1,24 @@
+spring.datasource.url=jdbc:postgresql://localhost:5432/lf8_starter_db
+spring.datasource.username=lf8_starter
+spring.datasource.password=secret
+server.port=8080
+spring.jpa.hibernate.ddl-auto=create-drop
+
+
+
+spring.application.name=lf8_starter
+#client registration configuration
+spring.security.oauth2.client.registration.keycloak.client-id=employee-management-service
+spring.security.oauth2.client.registration.keycloak.authorization-grant-type=authorization_code
+spring.security.oauth2.client.registration.keycloak.scope=openid
+
+#OIDC provider configuration:
+spring.security.oauth2.client.provider.keycloak.issuer-uri=https://keycloak.szut.dev/auth/realms/szut
+spring.security.oauth2.client.provider.keycloak.user-name-attribute=preferred_username
+logging.level.org.springframework.security=DEBUG
+#validating JWT token against our Keycloak server
+spring.security.oauth2.resourceserver.jwt.issuer-uri=https://keycloak.szut.dev/auth/realms/szut
+
+springdoc.swagger-ui.path=swagger
+springdoc.swagger-ui.try-it-out-enabled=true
+

src/test/java/de/szut/lf8_starter/Lf8StarterApplicationTests.java

@@ -0,0 +1,13 @@
+package de.szut.lf8_starter;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Lf8StarterApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}