#2 Logging mit kotlin-logging implementiert

books/build.gradle.kts

@@ -32,7 +32,7 @@ kotlin {
             implementation(libs.ktor.client)
             implementation(libs.ktor.clientCio)
             implementation(libs.ktor.clientAuth)
-            implementation(libs.ktor.clientLogging)
+//            implementation(libs.ktor.clientLogging)
             implementation(libs.ktor.clientContentNegotiation)
             implementation(libs.ktor.serializationJson)
             implementation(libs.ktor.serverCore)
@@ -43,6 +43,8 @@ kotlin {
             implementation(libs.koin.compose)
             implementation(libs.koin.compose.viewmodel)
 //            implementation(libs.koin.compose.viewmodel.navigation)
+            implementation(libs.kotlin.logging)
+            implementation(libs.logback)
             implementation(projects.shared)
         }
 //        commonTest.dependencies {
@@ -51,10 +53,7 @@ kotlin {
         jvmMain.dependencies {
             implementation(compose.desktop.currentOs)
             implementation(libs.kotlinx.coroutinesSwing)
-            implementation(libs.ktor.clientJava)  // ??
-//            implementation(libs.ktor.serverCio)
-//            implementation(libs.ktor.serverCore)
-//            implementation(libs.ktor.serverNetty)
+//            implementation(libs.ktor.clientJava)  // ??
             implementation(libs.ktor.serverAuthJwt) // nicht f. js, wasmJs
         }
 //        wasmJsMain.dependencies {

books/buildnumber.properties

@@ -1,3 +1,3 @@
 #auto generated
-#Fri Feb 06 16:36:58 CET 2026
-build.number=212
+#Fri Feb 06 23:31:36 CET 2026
+build.number=221

books/src/commonMain/kotlin/net/keinekekse/app/App.kt

@@ -14,6 +14,7 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.client.*
 import io.ktor.client.request.*
 import io.ktor.client.statement.*
@@ -27,6 +28,8 @@ import org.jetbrains.compose.resources.painterResource
 import org.koin.compose.koinInject
 import org.koin.core.annotation.Single
 
+private val logger = KotlinLogging.logger {}
+
 @Composable
 @Preview
 fun App() {
@@ -52,7 +55,7 @@ fun App() {
             }
             Button(onClick = {
                 CoroutineScope(Dispatchers.Default).launch {
-                    println("requesting '/test'")
+                    logger.debug { "requesting '/test'" }
                     test.request("/test")
                 }
             }) {
@@ -77,10 +80,11 @@ class TestAuth(val httpClient: HttpClient) {
 
     private val srv = "https://kas.keinekekse.net/"
     suspend fun request(url: String) {
-        println("connecting")
+        logger.debug { "connecting" }
         val response = httpClient.get(srv + url)
-        println("call to $url")
-        println(response.status)
-        println(response.bodyAsText())
+        val body = response.bodyAsText()
+        logger.debug { "call to $url" }
+        logger.debug { response.status }
+        logger.debug { body }
     }
 }

books/src/commonMain/kotlin/net/keinekekse/app/books/Version.kt

@@ -4,13 +4,13 @@ import net.keinekekse.version.Version
 
 object VERSION: Version {
     override val version = "1.0.0"
-    override val fullVersion = "1.0.0+build.212"
+    override val fullVersion = "1.0.0+build.221"
     override val major = 1
     override val minor = 0
     override val patch = 0
     override val preRelease = ""
-    override val buildMetadata = "build.212"
-    override val buildDate = "2026-02-06T15:36:58.060625Z"
+    override val buildMetadata = "build.221"
+    override val buildDate = "2026-02-06T22:31:36.863331Z"
     override val displayName = "Books App"
     override val copyright = "Copyright (c) 2026 Hartmut Bauer"
     override val name = "books"

books/src/commonMain/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="debug">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>

books/src/jvmMain/kotlin/net/keinekekse/app/auth/AuthModule.kt

@@ -1,5 +1,6 @@
 package net.keinekekse.app.auth
 
+import io.github.oshai.kotlinlogging.KotlinLogging
 import kotlinx.coroutines.CompletableDeferred
 import net.keinekekse.app.config.ConfigProperties
 import org.koin.core.annotation.Single
@@ -7,6 +8,8 @@ import java.security.MessageDigest
 import java.security.SecureRandom
 import java.util.*
 
+private val logger = KotlinLogging.logger {}
+
 sealed interface AuthResult {
     class Success : AuthResult
 

books/src/jvmMain/kotlin/net/keinekekse/app/auth/Authenticator.kt

@@ -1,6 +1,7 @@
 package net.keinekekse.app.auth
 
 import com.auth0.jwt.JWT
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.client.*
 import io.ktor.client.call.*
 import io.ktor.client.plugins.*
@@ -27,6 +28,8 @@ import java.net.Socket
 import java.util.*
 import kotlin.use
 
+private val logger = KotlinLogging.logger {}
+
 @Single
 class Authenticator(
     val tokenService: TokenService,
@@ -54,11 +57,11 @@ class Authenticator(
             val access = JWT.decode(tokens.accessToken)
             val refresh = JWT.decode(tokens.refreshToken)
             val now = Date()
-            println("Now: $now")
-            println("Token expires at: ${access.expiresAt}")
-            println("Token is expired: ${access.expiresAt.before(Date())}")
-            println("Refresh token expires at: ${refresh.expiresAt}")
-            println("Refresh token is expired: ${refresh.expiresAt.before(Date())}")
+            logger.debug { "Now: $now" }
+            logger.debug { "Token expires at: ${access.expiresAt}" }
+            logger.debug { "Token is expired: ${access.expiresAt.before(Date())}" }
+            logger.debug { "Refresh token expires at: ${refresh.expiresAt}" }
+            logger.debug { "Refresh token is expired: ${refresh.expiresAt.before(Date())}" }
             if (access.expiresAt.before(now)) {
                 // access_token ungültig
                 if (refresh.expiresAt.before(now)) {
@@ -66,10 +69,10 @@ class Authenticator(
                     return doAuthentication()
                 } else {
                     val result = requestRefreshToken(tokens)
-                    if (result != null) {
-                        return AuthResult.Success()
+                    return if (result != null) {
+                        AuthResult.Success()
                     } else {
-                        return doAuthentication()
+                        doAuthentication()
                     }
                 }
             } else {
@@ -145,32 +148,33 @@ class Authenticator(
 
             else -> {
                 tokenService.setTokens(null)
-                println("Error refreshing tokens: ")
+                logger.debug { "Error refreshing tokens: " }
                 var error = ""
                 var errorDetails = ""
                 when (val err = result.first) {
                     is AuthResult.Fatal -> {
-                        println(err.code)
+                        logger.debug { err.code }
                         error = err.message ?: ""
                         errorDetails = err.details ?: ""
                     }
 
                     is AuthResult.Error -> {
-                        println(err.code)
+                        logger.debug { err.code }
                         error = err.message ?: ""
                         errorDetails = err.details ?: ""
                     }
 
                     is AuthResult.Success -> println("Success ???")
                 }
-                println("Status: ${response.status}")
-                println("Error: $error")
-                println("Description: $errorDetails")
-                if (error == "invalid_grant") {
+                logger.debug { "Status: ${response.status}" }
+                logger.debug { "Error: #$error#" }
+                logger.debug { "Description: $errorDetails" }
+                return if (error == "invalid_grant") {
                     // session expired || token is invalid
-                    return reAuthenticate()
+                    logger.debug { "Session expired or token invalid. Re-authenticating..." }
+                    reAuthenticate()
                 } else {
-                    return null
+                    null
                 }
             }
         }
@@ -182,7 +186,7 @@ class Authenticator(
             Socket(KeycloakConfig.LOCALHOST, port).use { true }
         } catch (e: Exception) {
             // Port is closed or unreachable
-            println("${e.javaClass.simpleName}: ${e.message}")
+            logger.debug { "${e.javaClass.simpleName}: ${e.message}" }
             false
         }
 
@@ -341,7 +345,6 @@ class Authenticator(
     data class TokenErrorResponse(
         @SerialName("error") val error: String,
         @SerialName("error_description") val errorDescription: String?,
-        @SerialName("session_state") val sessionState: String?,
     )
 
     private suspend fun requestTokens(config: AuthRun, authCode: String?): AuthResult {

books/src/jvmMain/kotlin/net/keinekekse/app/main.kt

@@ -3,9 +3,12 @@ package net.keinekekse.app
 //import org.koin.plugin.module.dsl.startKoin
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
+import io.github.oshai.kotlinlogging.KotlinLogging
 import net.keinekekse.app.books.di.KoinApp
 import org.koin.plugin.module.dsl.startKoin
 
+private val logger = KotlinLogging.logger {}
+
 //@PropertyValue("kc_server")
 //var keycloakServer: String = ""
 //
@@ -18,7 +21,8 @@ import org.koin.plugin.module.dsl.startKoin
 fun main() = application {
 
     startKoin<KoinApp>()
-
+    logger.info { "Koin started" }
+    logger.debug { "Debugging Koin start" }
 //    val config: ConfigProperties = koinInject()
 //    val settings: Settings = koinInject()
 

books/src/jvmMain/kotlin/net/keinekekse/app/service/HttpClient.kt

@@ -1,6 +1,7 @@
 package net.keinekekse.app.service
 
 import com.auth0.jwt.JWT
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.client.*
 import io.ktor.client.plugins.*
 import io.ktor.client.plugins.auth.*
@@ -13,6 +14,8 @@ import net.keinekekse.app.auth.Authenticator
 import org.koin.core.annotation.Single
 import java.util.*
 
+private val logger = KotlinLogging.logger {}
+
 @OptIn(ExperimentalSerializationApi::class)
 @Single
 fun createHttpClient(authenticator: Authenticator): HttpClient {
@@ -20,32 +23,32 @@ fun createHttpClient(authenticator: Authenticator): HttpClient {
         install(Auth) {
             bearer {
                 loadTokens {
-                    println("HTTPClient: loadTokens")
+                    logger.debug { "HTTPClient: loadTokens" }
 //                    tokenService.getTokens()
                     authenticator.tokenService.getTokens()
                 }
                 refreshTokens {
-                    println("HTTPClient: refreshTokens")
+                    logger.debug { "HTTPClient: refreshTokens" }
 //                val tokens = authenticator.tokenService.getTokens()
                     if (oldTokens != null) {
                         val access = JWT.decode(oldTokens?.accessToken)
                         val refresh = JWT.decode(oldTokens?.refreshToken)
                         val now = Date()
-                        println("Now: $now")
-                        println("Token expires at: ${access.expiresAt}")
-                        println("Token is expired: ${access.expiresAt.before(Date())}")
-                        println("Refresh token expires at: ${refresh.expiresAt}")
-                        println("Refresh token is expired: ${refresh.expiresAt.before(Date())}")
+                        logger.debug { "Now: $now" }
+                        logger.debug { "Token expires at: ${access.expiresAt}" }
+                        logger.debug { "Token is expired: ${access.expiresAt.before(Date())}" }
+                        logger.debug { "Refresh token expires at: ${refresh.expiresAt}" }
+                        logger.debug { "Refresh token is expired: ${refresh.expiresAt.before(Date())}" }
 
                         if (refresh.expiresAt.before(now)) {
-                            println("refresh token expired - HOW TO authenticate")
+                            logger.debug { "refresh token expired - HOW TO authenticate" }
                             authenticator.reAuthenticate()
                         } else {
-                            println("refresh token valid - request new tokens")
+                            logger.debug { "refresh token valid - request new tokens" }
                             authenticator.requestRefreshToken(oldTokens)
                         }
                     } else {
-                        println("no tokens - authenticate")
+                        logger.debug { "no tokens - authenticate" }
                         authenticator.reAuthenticate()
                     }
                 }
@@ -68,9 +71,9 @@ fun createHttpClient(authenticator: Authenticator): HttpClient {
     }
 
     client.plugin(HttpSend).intercept { request ->
-        println("HTTPClient: intercept ${request.url}")
+        logger.debug { "HTTPClient: intercept ${request.url}" }
         val originalCall = execute(request)
-        println("HTTPClient: response status ${originalCall.response.status}")
+        logger.debug { "HTTPClient: response status ${originalCall.response.status}" }
         originalCall
 //    val originalCall = execute(request)
 //    if (originalCall.response.status.value !in 100..399) {

books/src/jvmMain/kotlin/net/keinekekse/app/service/TokenService.kt

@@ -1,8 +1,11 @@
 package net.keinekekse.app.service
 
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.client.plugins.auth.providers.*
 import org.koin.core.annotation.Single
 
+private val logger = KotlinLogging.logger {}
+
 @Single
 class TokenService {
     private var tokens: BearerTokens? = null
@@ -11,9 +14,9 @@ class TokenService {
 
     fun setTokens(tokens: BearerTokens? = null) {
         this.tokens = tokens
-        println("set tokens")
-        println("Access Token: ${tokens?.accessToken}")
-        println("Refresh Token: ${tokens?.refreshToken}")
+        logger.debug { "set tokens" }
+        logger.debug { "Access Token: ${tokens?.accessToken}" }
+        logger.debug { "Refresh Token: ${tokens?.refreshToken}" }
     }
 
 }

gradle/libs.versions.toml

@@ -17,6 +17,7 @@ koin-bom = "4.2.0-RC1"
 koin-plugin = "0.3.0"
 ktor = "3.4.0"
 logback = "1.5.26"
+kotlinLogging = "7.0.14"
 material3 = "1.10.0-alpha05"
 settings = "1.3.0"
 dataStore = "1.2.0"
@@ -41,6 +42,7 @@ kotlinx-coroutinesSwing = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-s
 kotlinx-html = { module = "org.jetbrains.kotlinx:kotlinx-html", version.ref = "kotlinx-html" }
 kotlin-wrappersCss = { module = "org.jetbrains.kotlin-wrappers:kotlin-css-jvm", version.ref = "kotlin-wrappers-css" }
 logback = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
+kotlin-logging = { module = "io.github.oshai:kotlin-logging", version.ref = "kotlinLogging" }
 ktor-serverCore = { module = "io.ktor:ktor-server-core", version.ref = "ktor" }
 ktor-serverNetty = { module = "io.ktor:ktor-server-netty", version.ref = "ktor" }
 ktor-serverCio = { module = "io.ktor:ktor-server-cio", version.ref = "ktor" }

server/build.gradle.kts

@@ -23,6 +23,7 @@ dependencies {
     implementation(masterLibs.utilLibrary)
 //    implementation(projects.shared)  // err wg. doppelter jar ??
     implementation(libs.logback)
+    implementation(libs.kotlin.logging)
     implementation(libs.ktor.serverCore)
     implementation(libs.ktor.serverNetty)
     implementation(libs.ktor.serverAuth)

server/src/main/kotlin/net/keinekekse/app/Application.kt

@@ -1,14 +1,17 @@
 package net.keinekekse.app
 
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.server.application.*
 import io.ktor.server.engine.*
 import io.ktor.server.netty.*
 import net.keinekekse.app.server.VERSION
 import net.keinekekse.app.server.config.configureSecurity
 
+private val logger = KotlinLogging.logger {}
+
 fun main() {
 //    embeddedServer(Netty, port = SERVER_PORT, host = "0.0.0.0", module = Application::module)
-    println("**\n** Starting  ${VERSION.displayName} - ${VERSION.description} ${VERSION.fullVersion}\n**")
+    logger.debug { "**\n** Starting  ${VERSION.displayName} - ${VERSION.description} ${VERSION.fullVersion}\n**" }
     embeddedServer(Netty, port = 7770, host = "0.0.0.0", module = Application::module)
         .start(wait = true)
 }

server/src/main/kotlin/net/keinekekse/app/server/config/security.kt

@@ -1,6 +1,7 @@
 package net.keinekekse.app.server.config
 
 import com.auth0.jwk.UrlJwkProvider
+import io.github.oshai.kotlinlogging.KotlinLogging
 import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.auth.*
@@ -10,6 +11,8 @@ import io.ktor.server.routing.*
 import net.keinekekse.app.server.VERSION
 import java.net.URI
 
+private val logger = KotlinLogging.logger {}
+
 fun Application.configureSecurity() {
 
     // TODO die Werte müssen aus der Config kommen

server/src/main/resources/logback.xml

@@ -9,4 +9,4 @@
     </root>
     <logger name="org.eclipse.jetty" level="INFO"/>
     <logger name="io.netty" level="INFO"/>
-</configuration>
+</configuration>

shared/build.gradle.kts

@@ -26,6 +26,7 @@ kotlin {
         commonMain.dependencies {
             implementation(libs.bundles.kotlin.compose)
             implementation(libs.ktor.serializationJson)
+            implementation(libs.ktor.clientLogging)
 
         }
         jvmMain.dependencies {