Merge pull request #2 from eugenp/master

updated

.travis.yml

@@ -4,7 +4,7 @@ before_install:
   - echo "MAVEN_OPTS='-Xmx2048M -Xss128M -XX:+CMSClassUnloadingEnabled -XX:+UseG1GC -XX:-UseGCOverheadLimit'" > ~/.mavenrc
 
 install: skip
-script: travis_wait 60 mvn -q install
+script: travis_wait 60 mvn -q install -Pdefault
 
 sudo: required
 

apache-avro/pom.xml

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>apache-avro-tutorial</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <compiler-plugin.version>3.5</compiler-plugin.version>
+        <avro.version>1.8.2</avro.version>
+        <java.version>1.8</java.version>
+        <slf4j.version>1.7.25</slf4j.version>
+    </properties>
+	
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.10</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>${slf4j.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.avro</groupId>
+            <artifactId>avro</artifactId>
+            <version>${avro.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.avro</groupId>
+            <artifactId>avro-compiler</artifactId>
+            <version>${avro.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.avro</groupId>
+            <artifactId>avro-maven-plugin</artifactId>
+            <version>${avro.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${compiler-plugin.version}</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.avro</groupId>
+                <artifactId>avro-maven-plugin</artifactId>
+                <version>${avro.version}</version>
+                <executions>
+                    <execution>
+                        <id>schemas</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>schema</goal>
+                            <goal>protocol</goal>
+                            <goal>idl-protocol</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirectory>${project.basedir}/src/main/resources/</sourceDirectory>
+                            <outputDirectory>${project.basedir}/src/main/java/</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

apache-avro/src/main/java/com/baeldung/avro/util/AvroClassGenerator.java

@@ -0,0 +1,14 @@
+package com.baeldung.avro.util;
+
+import org.apache.avro.Schema;
+import org.apache.avro.compiler.specific.SpecificCompiler;
+
+import java.io.File;
+import java.io.IOException;
+
+public class AvroClassGenerator {
+    public void generateAvroClasses() throws IOException {
+        SpecificCompiler compiler = new SpecificCompiler(new Schema.Parser().parse(new File("src/main/resources/avroHttpRequest-schema.avsc")));
+        compiler.compileToDestination(new File("src/main/resources"), new File("src/main/java")); 
+    }
+}

apache-avro/src/main/java/com/baeldung/avro/util/AvroSchemaBuilder.java

@@ -0,0 +1,24 @@
+package com.baeldung.avro.util;
+
+
+import org.apache.avro.Schema;
+import org.apache.avro.SchemaBuilder;
+
+public class AvroSchemaBuilder {
+
+    public Schema createAvroHttpRequestSchema(){
+
+        Schema clientIdentifier = SchemaBuilder.record("ClientIdentifier").namespace("com.baeldung.avro.model")
+                .fields().requiredString("hostName").requiredString("ipAddress").endRecord();
+
+        Schema avroHttpRequest = SchemaBuilder.record("AvroHttpRequest").namespace("com.baeldung.avro.model").fields()
+                .requiredLong("requestTime")
+                .name("clientIdentifier").type(clientIdentifier).noDefault()
+                .name("employeeNames").type().array().items().stringType().arrayDefault(null)
+                .name("active").type().enumeration("Active").symbols("YES", "NO").noDefault()
+                .endRecord();
+        return avroHttpRequest;
+    }
+}
+
+

apache-avro/src/main/java/com/baeldung/avro/util/model/Active.java

@@ -0,0 +1,13 @@
+/**
+ * Autogenerated by Avro
+ *
+ * DO NOT EDIT DIRECTLY
+ */
+package com.baeldung.avro.util.model;
+@SuppressWarnings("all")
+@org.apache.avro.specific.AvroGenerated
+public enum Active {
+  YES, NO  ;
+  public static final org.apache.avro.Schema SCHEMA$ = new org.apache.avro.Schema.Parser().parse("{\"type\":\"enum\",\"name\":\"Active\",\"namespace\":\"com.baeldung.avro.model\",\"symbols\":[\"YES\",\"NO\"]}");
+  public static org.apache.avro.Schema getClassSchema() { return SCHEMA$; }
+}

apache-avro/src/main/java/com/baeldung/avro/util/serealization/AvroDeSerealizer.java

@@ -0,0 +1,33 @@
+package com.baeldung.avro.util.serealization;
+
+import com.baeldung.avro.util.model.AvroHttpRequest;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.Decoder;
+import org.apache.avro.io.DecoderFactory;
+import org.apache.avro.specific.SpecificDatumReader;
+
+import java.io.IOException;
+
+public class AvroDeSerealizer {
+
+public AvroHttpRequest deSerealizeAvroHttpRequestJSON(byte[] data){
+    DatumReader<AvroHttpRequest> reader = new SpecificDatumReader<>(AvroHttpRequest.class);
+    Decoder decoder = null;
+    try {
+        decoder = DecoderFactory.get().jsonDecoder(AvroHttpRequest.getClassSchema(), new String(data));
+        return reader.read(null, decoder);
+    } catch (IOException e) {
+        return null;
+    }
+}
+
+public AvroHttpRequest deSerealizeAvroHttpRequestBinary(byte[] data){
+    DatumReader<AvroHttpRequest> employeeReader = new SpecificDatumReader<>(AvroHttpRequest.class);
+    Decoder decoder = DecoderFactory.get().binaryDecoder(data, null);
+    try {
+        return employeeReader.read(null, decoder);
+    } catch (IOException e) {
+        return null;
+    }
+}
+}

apache-avro/src/main/java/com/baeldung/avro/util/serealization/AvroSerealizer.java

@@ -0,0 +1,44 @@
+package com.baeldung.avro.util.serealization;
+
+import com.baeldung.avro.util.model.AvroHttpRequest;
+import org.apache.avro.io.*;
+import org.apache.avro.specific.SpecificDatumWriter;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class AvroSerealizer {
+
+public byte[] serealizeAvroHttpRequestJSON(AvroHttpRequest request){
+    DatumWriter<AvroHttpRequest> writer = new SpecificDatumWriter<>(AvroHttpRequest.class);
+    byte[] data = new byte[0];
+    ByteArrayOutputStream stream = new ByteArrayOutputStream();
+    Encoder jsonEncoder = null;
+    try {
+        jsonEncoder = EncoderFactory.get().jsonEncoder(AvroHttpRequest.getClassSchema(), stream);
+        writer.write(request, jsonEncoder);
+        jsonEncoder.flush();
+        data = stream.toByteArray();
+    } catch (IOException e) {
+        data =null;
+    }
+    return data;
+}
+
+public byte[] serealizeAvroHttpRequestBinary(AvroHttpRequest request){
+    DatumWriter<AvroHttpRequest> writer = new SpecificDatumWriter<>(AvroHttpRequest.class);
+    byte[] data = new byte[0];
+    ByteArrayOutputStream stream = new ByteArrayOutputStream();
+    Encoder jsonEncoder = EncoderFactory.get().binaryEncoder(stream,null);
+    try {
+        writer.write(request, jsonEncoder);
+        jsonEncoder.flush();
+        data = stream.toByteArray();
+    } catch (IOException e) {
+        data = null;
+    }
+
+    return data;
+}
+
+}

apache-avro/src/main/resources/avroHttpRequest-schema.avsc

@@ -0,0 +1,47 @@
+{
+  "type":"record",
+  "name":"AvroHttpRequest",
+  "namespace":"com.baeldung.avro.model",
+  "fields":[
+    {
+      "name":"requestTime",
+      "type":"long"
+    },
+    {
+      "name":"clientIdentifier",
+      "type":{
+        "type":"record",
+        "name":"ClientIdentifier",
+        "fields":[
+          {
+            "name":"hostName",
+            "type":"string"
+          },
+          {
+            "name":"ipAddress",
+            "type":"string"
+          }
+        ]
+      }
+    },
+    {
+      "name":"employeeNames",
+      "type":{
+        "type":"array",
+        "items":"string"
+      },
+      "default":null
+    },
+    {
+      "name":"active",
+      "type":{
+        "type":"enum",
+        "name":"Active",
+        "symbols":[
+          "YES",
+          "NO"
+        ]
+      }
+    }
+  ]
+}

apache-avro/src/test/java/com/baeldung/avro/util/serealization/AvroSerealizerDeSerealizerTest.java

@@ -0,0 +1,75 @@
+package com.baeldung.avro.util.serealization;
+
+import com.baeldung.avro.util.model.Active;
+import com.baeldung.avro.util.model.AvroHttpRequest;
+import com.baeldung.avro.util.model.ClientIdentifier;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+import static org.junit.Assert.*;
+
+public class AvroSerealizerDeSerealizerTest {
+
+    AvroSerealizer serealizer;
+    AvroDeSerealizer deSerealizer;
+    AvroHttpRequest request;
+
+    @Before
+    public void setUp() throws Exception {
+        serealizer = new AvroSerealizer();
+        deSerealizer = new AvroDeSerealizer();
+
+        ClientIdentifier clientIdentifier = ClientIdentifier.newBuilder().
+                setHostName("localhost").setIpAddress("255.255.255.0").build();
+
+        List<CharSequence> employees = new ArrayList();
+        employees.add("James");
+        employees.add("Alice");
+        employees.add("David");
+        employees.add("Han");
+
+        request = AvroHttpRequest.newBuilder().setRequestTime(01l)
+                .setActive(Active.YES).setClientIdentifier(clientIdentifier)
+                .setEmployeeNames(employees).build();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+    }
+
+@Test
+public void WhenSerialized_UsingJSONEncoder_ObjectGetsSerialized(){
+    byte[] data = serealizer.serealizeAvroHttpRequestJSON(request);
+    assertTrue(Objects.nonNull(data));
+    assertTrue(data.length > 0);
+}
+
+@Test
+public void WhenSerialized_UsingBinaryEncoder_ObjectGetsSerialized(){
+    byte[] data = serealizer.serealizeAvroHttpRequestBinary(request);
+    assertTrue(Objects.nonNull(data));
+    assertTrue(data.length > 0);
+}
+
+@Test
+public void WhenDeserialize_UsingJSONDecoder_ActualAndExpectedObjectsAreEqual(){
+    byte[] data = serealizer.serealizeAvroHttpRequestJSON(request);
+    AvroHttpRequest actualRequest = deSerealizer.deSerealizeAvroHttpRequestJSON(data);
+    assertEquals(actualRequest,request);
+    assertTrue(actualRequest.getRequestTime().equals(request.getRequestTime()));
+}
+
+@Test
+public void WhenDeserialize_UsingBinaryecoder_ActualAndExpectedObjectsAreEqual(){
+    byte[] data = serealizer.serealizeAvroHttpRequestBinary(request);
+    AvroHttpRequest actualRequest = deSerealizer.deSerealizeAvroHttpRequestBinary(data);
+    assertEquals(actualRequest,request);
+    assertTrue(actualRequest.getRequestTime().equals(request.getRequestTime()));
+}
+}
+

core-java-8/src/main/java/com/baeldung/convertlisttomap/Animal.java

@@ -0,0 +1,27 @@
+package com.baeldung.convertlisttomap;
+
+public class Animal {
+    private int id;
+    private String name;
+
+    public Animal(int id, String name) {
+        this.id = id;
+        this.setName(name);
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

core-java-8/src/main/java/com/baeldung/convertlisttomap/ConvertListToMapService.java

@@ -0,0 +1,52 @@
+package com.baeldung.convertlisttomap;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.apache.commons.collections4.IterableUtils;
+import org.apache.commons.collections4.MapUtils;
+import com.google.common.collect.Maps;
+
+public class ConvertListToMapService {
+
+    public Map<Integer, Animal> convertListBeforeJava8(List<Animal> list) {
+        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
+        for (Animal animal : list) {
+            map.put(animal.getId(), animal);
+        }
+        return map;
+    }
+
+    public Map<Integer, Animal> convertListAfterJava8(List<Animal> list) {
+        Map<Integer, Animal> map = list.stream().collect(Collectors.toMap(Animal::getId, animal -> animal));
+        return map;
+    }
+
+    public Map<Integer, Animal> convertListWithGuava(List<Animal> list) {
+
+        Map<Integer, Animal> map = Maps.uniqueIndex(list, Animal::getId);
+        return map;
+    }
+
+    public Map<Integer, Animal> convertListWithApacheCommons1(List<Animal> list) {
+
+        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
+
+        IterableUtils.forEach(list, animal -> {
+            map.put(animal.getId(), animal);
+        });
+
+        return map;
+    }
+
+    public Map<Integer, Animal> convertListWithApacheCommons2(List<Animal> list) {
+
+        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
+
+        MapUtils.populateMap(map, list, Animal::getId);
+
+        return map;
+    }
+}

core-java-8/src/test/java/com/baeldung/convertlisttomap/ConvertListToMapServiceUnitTest.java

@@ -0,0 +1,73 @@
+package com.baeldung.convertlisttomap;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class ConvertListToMapServiceUnitTest {
+    List<Animal> list;
+
+    private ConvertListToMapService convertListService;
+
+    @Before
+    public void init() {
+        this.convertListService = new ConvertListToMapService();
+        this.list = new ArrayList<>();
+
+        Animal cat = new Animal(1, "Cat");
+        list.add(cat);
+        Animal dog = new Animal(2, "Dog");
+        list.add(dog);
+        Animal pig = new Animal(3, "Pig");
+        list.add(pig);
+        Animal cow = new Animal(4, "Cow");
+        list.add(cow);
+        Animal goat = new Animal(5, "Goat");
+        list.add(goat);
+    }
+
+    @Test
+    public void givenAList_whenConvertBeforeJava8_thenReturnMapWithTheSameElements() {
+
+        Map<Integer, Animal> map = convertListService.convertListBeforeJava8(list);
+
+        assertThat(map.values(), containsInAnyOrder(list.toArray()));
+    }
+
+    @Test
+    public void givenAList_whenConvertAfterJava8_thenReturnMapWithTheSameElements() {
+
+        Map<Integer, Animal> map = convertListService.convertListAfterJava8(list);
+
+        assertThat(map.values(), containsInAnyOrder(list.toArray()));
+    }
+
+    @Test
+    public void givenAList_whenConvertWithGuava_thenReturnMapWithTheSameElements() {
+
+        Map<Integer, Animal> map = convertListService.convertListWithGuava(list);
+
+        assertThat(map.values(), containsInAnyOrder(list.toArray()));
+    }
+
+    @Test
+    public void givenAList_whenConvertWithApacheCommons1_thenReturnMapWithTheSameElements() {
+
+        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons1(list);
+
+        assertThat(map.values(), containsInAnyOrder(list.toArray()));
+    }
+
+    @Test
+    public void givenAList_whenConvertWithApacheCommons2_thenReturnMapWithTheSameElements() {
+
+        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons2(list);
+
+        assertThat(map.values(), containsInAnyOrder(list.toArray()));
+    }
+}

core-java-collections/src/test/java/com/baeldung/java/set/HashSetInitalizingUnitTest.java

@@ -50,22 +50,9 @@ public class HashSetInitalizingUnitTest {
 
     @Test
     public void whenUsingJava8_usingCollectOnStream_thenCorrectSize() {
-        Set<String> set = Stream.of("a", "b", "c").collect(Collectors.toSet());
+        Set<String> set = Stream.of("a", "b", "c").collect(Collectors.toCollection(HashSet::new));
         assertEquals(3, set.size());
     }
-    @Test
-    public void whenUsingJava8_fromStringArray_thenCorrectSize() {
-        String[] stringArray = {"a","b","c"};
-        Set<String> set = Arrays.stream(stringArray).collect(Collectors.toCollection(HashSet::new));
-        assertEquals(3, set.size());
-    }
-
-    // Requires Java9 - uncomment if you are using Java 9 or higher
-    /*@Test
-    public void whenUsingJava9_usingCollectOnStream_thenCorrectSize() {
-        Set set = Set.of("a", "b", "c");
-        assertEquals(3, set.size());
-    }*/
 
     @Test
     public void whenUsingGoogleGuava_createMutableSet_thenCorrectSize() {
@@ -78,4 +65,6 @@ public class HashSetInitalizingUnitTest {
         Set<String> set = ImmutableSet.of("a", "b", "c");
         assertEquals(3, set.size());
     }
+  
 }
+

core-kotlin/pom.xml

@@ -60,7 +60,6 @@
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-reflect</artifactId>
             <version>${kotlin-reflect.version}</version>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlinx</groupId>
@@ -224,10 +223,11 @@
     </build>
 
     <properties>
-        <kotlin-maven-plugin.version>1.2.41</kotlin-maven-plugin.version>
-        <kotlin-test-junit.version>1.2.41</kotlin-test-junit.version>
-        <kotlin-stdlib.version>1.2.41</kotlin-stdlib.version>
-        <kotlin-reflect.version>1.2.41</kotlin-reflect.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <kotlin-maven-plugin.version>1.2.51</kotlin-maven-plugin.version>
+        <kotlin-test-junit.version>1.2.51</kotlin-test-junit.version>
+        <kotlin-stdlib.version>1.2.51</kotlin-stdlib.version>
+        <kotlin-reflect.version>1.2.51</kotlin-reflect.version>
         <kotlinx.version>0.22.5</kotlinx.version>
         <ktor.io.version>0.9.2</ktor.io.version>
         <mockito-kotlin.version>1.5.0</mockito-kotlin.version>

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/LoggerAsExtensionOnAny.kt

@@ -0,0 +1,30 @@
+package com.baeldung.kotlin.logging
+
+import org.slf4j.Logger
+
+open class LoggerAsExtensionOnAny {
+    val logger = logger()
+
+    fun log(s: String) {
+        logger().info(s)
+        logger.info(s)
+    }
+}
+
+class ExtensionSubclass : LoggerAsExtensionOnAny()
+
+fun <T : Any> T.logger(): Logger = getLogger(getClassForLogging(javaClass))
+
+fun main(args: Array<String>) {
+    LoggerAsExtensionOnAny().log("test")
+    ExtensionSubclass().log("sub")
+    "foo".logger().info("foo")
+    1.logger().info("uh-oh!")
+    SomeOtherClass().logger()
+}
+
+class SomeOtherClass {
+    fun logger(): String {
+        return "foo"
+    }
+}

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/LoggerAsExtensionOnMarkerInterface.kt

@@ -0,0 +1,30 @@
+package com.baeldung.kotlin.logging
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+interface Logging
+
+inline fun <reified T : Logging> T.logger(): Logger =
+        //Wrong logger name!
+        //LoggerFactory.getLogger(javaClass.name + " w/interface")
+        LoggerFactory.getLogger(getClassForLogging(T::class.java).name + " w/interface")
+
+open class LoggerAsExtensionOnMarkerInterface : Logging {
+    companion object : Logging {
+        val logger = logger()
+    }
+
+    fun log(s: String) {
+        logger().info(s)
+        logger.info(s)
+    }
+}
+
+class MarkerExtensionSubclass : LoggerAsExtensionOnMarkerInterface()
+
+fun main(args: Array<String>) {
+    LoggerAsExtensionOnMarkerInterface().log("test")
+    MarkerExtensionSubclass().log("sub")
+    "foo".logger().info("foo")
+}

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/LoggerAsProperty.kt

@@ -0,0 +1,17 @@
+package com.baeldung.kotlin.logging
+
+open class LoggerAsProperty {
+    private val logger = getLogger(javaClass)
+
+    fun log(s: String) {
+        logger.info(s)
+    }
+
+}
+
+class PropertySubclass : LoggerAsProperty()
+
+fun main(args: Array<String>) {
+    LoggerAsProperty().log("test")
+    PropertySubclass().log("sub")
+}

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/LoggerAsPropertyDelegate.kt

@@ -0,0 +1,47 @@
+package com.baeldung.kotlin.logging
+
+import org.slf4j.Logger
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+
+open class LoggerAsPropertyDelegate {
+    private val lazyLogger by lazyLogger()
+    protected val logger by LoggerDelegate()
+    private val logger2 = logger
+
+    companion object {
+        private val lazyLoggerComp by lazyLogger()
+        private val loggerComp by LoggerDelegate()
+    }
+
+    open fun log(s: String) {
+        logger.info(s)
+        logger2.info(s)
+        lazyLogger.info(s)
+        loggerComp.info(s)
+        lazyLoggerComp.info(s)
+    }
+
+}
+
+class DelegateSubclass : LoggerAsPropertyDelegate() {
+    override fun log(s: String) {
+        logger.info("-- in sub")
+        super.log(s)
+    }
+}
+
+fun lazyLogger(forClass: Class<*>): Lazy<Logger> =
+        lazy { getLogger(getClassForLogging(forClass)) }
+
+fun <T : Any> T.lazyLogger(): Lazy<Logger> = lazyLogger(javaClass)
+
+fun main(args: Array<String>) {
+    LoggerAsPropertyDelegate().log("test")
+    DelegateSubclass().log("sub")
+}
+
+class LoggerDelegate<in R : Any> : ReadOnlyProperty<R, Logger> {
+    override fun getValue(thisRef: R, property: KProperty<*>) =
+        getLogger(getClassForLogging(thisRef.javaClass))
+}

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/LoggerInCompanionObject.kt

@@ -0,0 +1,44 @@
+package com.baeldung.kotlin.logging
+
+open class LoggerInCompanionObject {
+    companion object {
+        private val loggerWithExplicitClass = getLogger(LoggerInCompanionObject::class.java)
+        @Suppress("JAVA_CLASS_ON_COMPANION")
+        private val loggerWithWrongClass = getLogger(javaClass)
+        @Suppress("JAVA_CLASS_ON_COMPANION")
+        private val logger = getLogger(javaClass.enclosingClass)
+    }
+
+    fun log(s: String) {
+        loggerWithExplicitClass.info(s)
+        loggerWithWrongClass.info(s)
+        logger.info(s)
+    }
+
+    class Inner {
+        companion object {
+            private val loggerWithExplicitClass = getLogger(Inner::class.java)
+            @Suppress("JAVA_CLASS_ON_COMPANION")
+            @JvmStatic
+            private val loggerWithWrongClass = getLogger(javaClass)
+            @Suppress("JAVA_CLASS_ON_COMPANION")
+            @JvmStatic
+            private val logger = getLogger(javaClass.enclosingClass)
+        }
+
+        fun log(s: String) {
+            loggerWithExplicitClass.info(s)
+            loggerWithWrongClass.info(s)
+            logger.info(s)
+        }
+    }
+
+}
+
+class CompanionSubclass : LoggerInCompanionObject()
+
+fun main(args: Array<String>) {
+    LoggerInCompanionObject().log("test")
+    LoggerInCompanionObject.Inner().log("test")
+    CompanionSubclass().log("sub")
+}

core-kotlin/src/main/kotlin/com/baeldung/kotlin/logging/Util.kt

@@ -0,0 +1,13 @@
+package com.baeldung.kotlin.logging
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import kotlin.reflect.full.companionObject
+
+fun getLogger(forClass: Class<*>): Logger = LoggerFactory.getLogger(forClass)
+
+fun <T : Any> getClassForLogging(javaClass: Class<T>): Class<*> {
+    return javaClass.enclosingClass?.takeIf {
+        it.kotlin.companionObject?.java == javaClass
+    } ?: javaClass
+}

jhipster/jhipster-monolithic/pom.xml

@@ -6,7 +6,7 @@
     <artifactId>jhipster-monolithic</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>war</packaging>
-    <name>JHipster Monolithic Application</name>
+    <description>JHipster Monolithic Application</description>
 
     <parent>
         <artifactId>parent-boot-1</artifactId>

jhipster/jhipster-monolithic/src/main/resources/logback-spring.xml

@@ -3,28 +3,9 @@
 <configuration scan="true">
     <include resource="org/springframework/boot/logging/logback/base.xml"/>
 
-<!-- The FILE and ASYNC appenders are here as examples for a production configuration -->
-<!--
-    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
-        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
-            <fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
-            <maxHistory>90</maxHistory>
-        </rollingPolicy>
-        <encoder>
-            <charset>utf-8</charset>
-            <Pattern>%d %-5level [%thread] %logger{0}: %msg%n</Pattern>
-        </encoder>
-    </appender>
+    <logger name="com.baeldung" level="INFO"/>
 
-    <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender">
-        <queueSize>512</queueSize>
-        <appender-ref ref="FILE"/>
-    </appender>
--->
-
-    <logger name="com.baeldung" level="#logback.loglevel#"/>
-
-    <logger name="io.github.jhipster" level="DEBUG"/>
+    <logger name="io.github.jhipster" level="INFO"/>
 
     <logger name="javax.activation" level="WARN"/>
     <logger name="javax.mail" level="WARN"/>

libraries/src/test/java/com/baeldung/hoverfly/HoverflyApiLiveTest.java

@@ -31,7 +31,7 @@ import org.springframework.web.client.RestTemplate;
 import io.specto.hoverfly.junit.core.SimulationSource;
 import io.specto.hoverfly.junit.rule.HoverflyRule;
 
-public class HoverflyApiIntegrationTest {
+public class HoverflyApiLiveTest {
 
     private static final SimulationSource source = dsl(service("http://www.baeldung.com").get("/api/courses/1").willReturn(success().body(jsonWithSingleQuotes("{'id':'1','name':'HCI'}")))
 

libraries/src/test/java/com/baeldung/infinispan/service/HelloWorldServiceTemporaryLiveTest.java

@@ -5,7 +5,7 @@ import org.junit.Test;
 
 import static org.assertj.core.api.Java6Assertions.assertThat;
 
-public class HelloWorldServiceIntegrationTest extends AbstractIntegrationTest {
+public class HelloWorldServiceTemporaryLiveTest extends AbstractIntegrationTest {
 
     @Test
     public void whenGetIsCalledTwoTimes_thenTheSecondShouldHitTheCache() {

micronaut/.mvn/wrapper/MavenWrapperDownloader.java

@@ -106,5 +106,4 @@ public class MavenWrapperDownloader {
         fos.close();
         rbc.close();
     }
-
 }