Convert the examples to Kotlin

Author: neboskreb

examples/app/build.gradle

@@ -1,16 +1,19 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     id 'com.android.application'
     id 'de.mannodermaus.android-junit5'
+    id 'org.jetbrains.kotlin.android'
 }
 
 android {
     namespace = 'com.github.neboskreb.log4j2.examples.app'
-    compileSdk = 35
+    compileSdk = 36
 
     defaultConfig {
         applicationId "com.github.neboskreb.log4j2.examples.app"
-        minSdk = 27
-        targetSdk = 35
+        minSdk = 26
+        targetSdk = 36
         versionCode 1
         versionName "1.0"
 
@@ -38,6 +41,12 @@ android {
         exclude 'META-INF/DEPENDENCIES'
         exclude 'META-INF/LICENSE*'
     }
+
+    kotlin {
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_17
+        }
+    }
 }
 
 dependencies {
@@ -51,12 +60,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.7.1'
 //    implementation 'com.android.support:design:28.0.0'
     implementation 'com.google.android.material:material:1.13.0'
-
-    // ==== Lombok
-    //noinspection AnnotationProcessorOnCompilePath -- because Lombok annotations are contained in this package, so you get import errors without it
-    compileOnly 'org.projectlombok:lombok:1.18.42'
-    annotationProcessor 'org.projectlombok:lombok:1.18.42'
-    // ==== /Lombok
+    implementation 'androidx.core:core-ktx:1.17.0'
 
 
     testImplementation platform('org.junit:junit-bom:5.14.0')

examples/app/src/androidTest/assets/log4j2.properties

@@ -10,8 +10,8 @@ appender.logcat.layout.pattern = %m%n
 appender.logcat.stack-trace-rendering = logcat
 
 
-logger.lib.name = com.github.neboskreb.lib
+logger.lib.name = com.github.neboskreb.log4j2.examples.lib
 logger.lib.level = off
 
-logger.app.name = com.github.neboskreb.app
+logger.app.name = com.github.neboskreb.log4j2.examples.app
 logger.app.level = off

examples/app/src/androidTest/java/com/github/neboskreb/log4j2/examples/app/GreatManagerAndroidTest.java

@@ -0,0 +1,45 @@
+package com.github.neboskreb.log4j2.examples.app
+
+import com.github.neboskreb.log4j2.android.AndroidLog4jExtension
+import com.github.neboskreb.log4j2.examples.lib.AwesomeWorker
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+
+@ExtendWith(AndroidLog4jExtension::class)
+class GreatManagerAndroidTest {
+    @Test
+    fun onLogFatalMessageClicked() {
+        // GIVEN
+        val awesomeWorker = AwesomeWorker()
+        val manager = GreatManager(awesomeWorker)
+
+        // WHEN
+        manager.onLogFatalMessageClicked()
+
+        // THEN see the logs
+    }
+
+    @Test
+    fun onLogWarnMessageClicked() {
+        // GIVEN
+        val awesomeWorker = AwesomeWorker()
+        val manager = GreatManager(awesomeWorker)
+
+        // WHEN
+        manager.onLogWarnMessageClicked()
+
+        // THEN see the logs
+    }
+
+    @Test
+    fun onLogDebugMessageClicked() {
+        // GIVEN
+        val awesomeWorker = AwesomeWorker()
+        val manager = GreatManager(awesomeWorker)
+
+        // WHEN
+        manager.onLogDebugMessageClicked()
+
+        // THEN see the logs
+    }
+}

examples/app/src/androidTest/kotlin/com/github/neboskreb/log4j2/examples/app/GreatManagerAndroidTest.kt

@@ -10,8 +10,8 @@ appender.logcat.layout.pattern = %m%n
 appender.logcat.stack-trace-rendering = logcat
 
 
-logger.lib.name = com.github.neboskreb.lib
+logger.lib.name = com.github.neboskreb.log4j2.examples.lib
 logger.lib.level = warn
 
-logger.app.name = com.github.neboskreb.app
+logger.app.name = com.github.neboskreb.log4j2.examples.app
 logger.app.level = debug

examples/app/src/debug/assets/log4j2.properties

@@ -0,0 +1,12 @@
+package com.github.neboskreb.log4j2.examples.app
+
+import android.app.Application
+import net.loune.log4j2android.AndroidLog4jHelper
+
+class App : Application() {
+    override fun onCreate() {
+        super.onCreate()
+
+        AndroidLog4jHelper.initialize(applicationContext)
+    }
+}

examples/app/src/main/java/com/github/neboskreb/log4j2/examples/app/App.java

@@ -0,0 +1,37 @@
+package com.github.neboskreb.log4j2.examples.app
+
+import com.github.neboskreb.log4j2.examples.lib.AwesomeWorker
+import org.apache.logging.log4j.LogManager
+import org.apache.logging.log4j.Logger
+
+private val log: Logger = LogManager.getLogger(GreatManager::class.java)
+
+/**
+ * Assume, this Manager uses a Worker to do stuff, and the worker prints messages to the log.
+ *
+ * Though you can't change the Worker's source from here, you can perfectly well control what it logs
+ * from your log4j2.properties, and see the result here.
+ */
+class GreatManager(
+    private val worker: AwesomeWorker
+) {
+    fun onLogFatalMessageClicked() {
+        worker.doGreatJob("Lorem", "Ipsum")
+
+        val throwable = Error("WTF (What a Terrible Failure!)")
+        log.fatal("This is FATAL level message", throwable)
+    }
+
+    fun onLogWarnMessageClicked() {
+        worker.doGreatJob("Lorem", "Ipsum")
+
+        val exception = Exception("Some error which happened elsewhere")
+        log.warn("This is WARN level message with suppressed exception", exception)
+    }
+
+    fun onLogDebugMessageClicked() {
+        worker.doNotSoGreatJob()
+
+        log.debug("This is DEBUG level message")
+    }
+}