NON-ISSUE Refactoring sample-spring-boot (#409)

* use logger

* remove compile

* use org.slf4j.LoggerFactory

Author: okue

sample-spring-boot-echo-kotlin/build.gradle

@@ -2,6 +2,6 @@ apply plugin: 'kotlin'
 apply plugin: 'org.springframework.boot'
 
 dependencies {
-    compile project(':line-bot-spring-boot')
-    compile 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
+    implementation project(':line-bot-spring-boot')
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
 }

sample-spring-boot-echo-kotlin/src/main/kotlin/com/example/bot/spring/echo/EchoApplication.kt

@@ -23,6 +23,7 @@ import com.linecorp.bot.model.message.Message
 import com.linecorp.bot.model.message.TextMessage
 import com.linecorp.bot.spring.boot.annotation.EventMapping
 import com.linecorp.bot.spring.boot.annotation.LineMessageHandler
+import org.slf4j.LoggerFactory
 import org.springframework.boot.SpringApplication
 import org.springframework.boot.autoconfigure.SpringBootApplication
 
@@ -33,15 +34,17 @@ fun main(args: Array<String>) {
 @SpringBootApplication
 @LineMessageHandler
 open class EchoApplication {
+    private val log = LoggerFactory.getLogger(EchoApplication::class.java)
+
     @EventMapping
     fun handleTextMessageEvent(event: MessageEvent<TextMessageContent>): Message {
-        println("event: $event")
+        log.info("event: $event")
         val originalMessageText = event.message.text
         return TextMessage(originalMessageText)
     }
 
     @EventMapping
     fun handleDefaultMessageEvent(event: Event) {
-        println("event: $event")
+        log.info("event: $event")
     }
 }

sample-spring-boot-echo/build.gradle

@@ -17,7 +17,7 @@
 apply plugin: 'org.springframework.boot'
 
 dependencies {
-    compile project(':line-bot-spring-boot')
+    implementation project(':line-bot-spring-boot')
 
     testImplementation "org.springframework.boot:spring-boot-starter-test"
 }

sample-spring-boot-echo/src/main/java/com/example/bot/spring/echo/EchoApplication.java

@@ -16,6 +16,8 @@
 
 package com.example.bot.spring.echo;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@@ -30,13 +32,15 @@
 @SpringBootApplication
 @LineMessageHandler
 public class EchoApplication {
+    private final Logger log = LoggerFactory.getLogger(EchoApplication.class);
+
     public static void main(String[] args) {
         SpringApplication.run(EchoApplication.class, args);
     }
 
     @EventMapping
     public Message handleTextMessageEvent(MessageEvent<TextMessageContent> event) {
-        System.out.println("event: " + event);
+        log.info("event: " + event);
         final String originalMessageText = event.getMessage().getText();
         return new TextMessage(originalMessageText);
     }