add sample log4j config to demo app (#523)

Co-authored-by: Muhammad Noman <[email protected]>
Co-authored-by: Muzahidul Islam <[email protected]>

gradle.properties

@@ -20,6 +20,7 @@ jsonSimpleVersion = 1.1.1
 logbackVersion = 1.2.3
 slf4jVersion = 1.7.30
 httpClientVersion = 4.5.14
+log4jVersion = 2.20.0
 
 # Style Packages
 findbugsAnnotationVersion = 3.0.1

java-quickstart/build.gradle

@@ -1,14 +1,16 @@
 apply plugin: 'java'
 
 dependencies {
-    compile project(':core-api')
-    compile project(':core-httpclient-impl')
+    implementation project(':core-api')
+    implementation project(':core-httpclient-impl')
 
-    compile group: 'com.google.code.gson', name: 'gson', version: gsonVersion
-    compile group: 'org.apache.httpcomponents', name: 'httpclient', version: httpClientVersion
-    compile group: 'org.slf4j', name: 'slf4j-simple', version: slf4jVersion
+    implementation group: 'com.google.code.gson', name: 'gson', version: gsonVersion
+    implementation group: 'org.apache.httpcomponents', name: 'httpclient', version: httpClientVersion
+    implementation group: 'org.apache.logging.log4j', name: 'log4j-api', version: log4jVersion
+    implementation group: 'org.apache.logging.log4j', name: 'log4j-core', version: log4jVersion
+    implementation group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: log4jVersion
 
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation group: 'junit', name: 'junit', version: junitVersion
 }
 
 task runExample(type: JavaExec) {

java-quickstart/src/main/resources/log4j2.properties

@@ -0,0 +1,10 @@
+# Set the root logger level to INFO and its appender to the console
+
+appender.console.type = Console
+appender.console.name = STDOUT
+appender.console.layout.type = PatternLayout
+appender.console.layout.pattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n
+
+# Specify the loggers
+rootLogger.level = debug
+rootLogger.appenderRef.stdout.ref = STDOUT