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BAEL-1767 - Java 9 Platform Logging API (eugenp#5071)
* java 9 logger * slf4j + logback modules added * new module for slf4j * logback config * cleanup * format
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‎core-java-9/logging.sh‎

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# compile logging module
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# javac --module-path mods -d mods/com.baeldung.logging src/modules/com.baeldung.logging/module-info.java src/modules/com.baeldung.logging/com/baeldung/logging/*.java
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# compile logging slf4j module
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javac --module-path mods -d mods/com.baeldung.logging.slf4j src/modules/com.baeldung.logging.slf4j/module-info.java src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/*.java
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# compile logging main app module
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javac --module-path mods -d mods/com.baeldung.logging.app src/modules/com.baeldung.logging.app/module-info.java src/modules/com.baeldung.logging.app/com/baeldung/logging/app/*.java
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# run logging main app
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# java --module-path mods -m com.baeldung.logging.app/com.baeldung.logging.app.MainApp
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# run looging main app using logback
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java --module-path mods -Dlogback.configurationFile=mods/logback.xml -m com.baeldung.logging.app/com.baeldung.logging.app.MainApp

‎core-java-9/mods/logback.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
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<pattern>
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%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} -- %msg%n
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</pattern>
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</encoder>
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</appender>
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<root>
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<appender-ref ref="STDOUT"/>
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</root>
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</configuration>

‎core-java-9/src/modules/com.baeldung.logging.app/com/baeldung/logging/app/MainApp.java‎

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package com.baeldung.logging.app;
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import static java.lang.System.Logger.*;
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public class MainApp {
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private static System.Logger LOGGER = System.getLogger("MainApp");
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public static void main(String[] args) {
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LOGGER.log(Level.ERROR, "error test");
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LOGGER.log(Level.INFO, "info test");
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}
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}

‎core-java-9/src/modules/com.baeldung.logging.app/module-info.java‎

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module com.baeldung.logging.app {
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}

‎core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLogger.java‎

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package com.baeldung.logging.slf4j;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ResourceBundle;
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public class Slf4jLogger implements System.Logger {
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private final String name;
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private final Logger logger;
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public Slf4jLogger(String name) {
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this.name = name;
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logger = LoggerFactory.getLogger(name);
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}
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@Override
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public String getName() {
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return name;
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}
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@Override
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public boolean isLoggable(Level level) {
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switch (level) {
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case OFF:
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return false;
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case TRACE:
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return logger.isTraceEnabled();
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case DEBUG:
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return logger.isDebugEnabled();
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case INFO:
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return logger.isInfoEnabled();
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case WARNING:
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return logger.isWarnEnabled();
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case ERROR:
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return logger.isErrorEnabled();
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case ALL:
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default:
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return true;
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}
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}
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@Override
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public void log(Level level, ResourceBundle bundle, String msg, Throwable thrown) {
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if (!isLoggable(level)) {
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return;
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}
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switch (level) {
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case TRACE:
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logger.trace(msg, thrown);
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break;
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case DEBUG:
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logger.debug(msg, thrown);
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break;
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case INFO:
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logger.info(msg, thrown);
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break;
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case WARNING:
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logger.warn(msg, thrown);
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break;
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case ERROR:
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logger.error(msg, thrown);
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break;
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case ALL:
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default:
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logger.info(msg, thrown);
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}
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}
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@Override
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public void log(Level level, ResourceBundle bundle, String format, Object... params) {
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if (!isLoggable(level)) {
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return;
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}
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switch (level) {
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case TRACE:
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logger.trace(format, params);
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break;
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case DEBUG:
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logger.debug(format, params);
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break;
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case INFO:
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logger.info(format, params);
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break;
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case WARNING:
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logger.warn(format, params);
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break;
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case ERROR:
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logger.error(format, params);
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break;
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case ALL:
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default:
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logger.info(format, params);
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}
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}
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}

‎core-java-9/src/modules/com.baeldung.logging.slf4j/com/baeldung/logging/slf4j/Slf4jLoggerFinder.java‎

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package com.baeldung.logging.slf4j;
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public class Slf4jLoggerFinder extends System.LoggerFinder {
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@Override
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public System.Logger getLogger(String name, Module module) {
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return new Slf4jLogger(name);
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}
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}

‎core-java-9/src/modules/com.baeldung.logging.slf4j/module-info.java‎

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module com.baeldung.logging.slf4j {
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requires org.slf4j;
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provides java.lang.System.LoggerFinder
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with com.baeldung.logging.slf4j.Slf4jLoggerFinder;
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exports com.baeldung.logging.slf4j;
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}

‎core-java-9/src/modules/com.baeldung.logging/com/baeldung/logging/ConsoleLogger.java‎

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package com.baeldung.logging;
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import java.text.MessageFormat;
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import java.util.ResourceBundle;
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public class ConsoleLogger implements System.Logger {
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@Override
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public String getName() {
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return "ConsoleLogger";
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}
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@Override
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public boolean isLoggable(Level level) {
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return true;
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}
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@Override
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public void log(Level level, ResourceBundle bundle, String msg, Throwable thrown) {
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System.out.printf("ConsoleLogger [%s]: %s - %s%n", level, msg, thrown);
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}
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@Override
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public void log(Level level, ResourceBundle bundle, String format, Object... params) {
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System.out.printf("ConsoleLogger [%s]: %s%n", level, MessageFormat.format(format, params));
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}
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}

‎core-java-9/src/modules/com.baeldung.logging/com/baeldung/logging/CustomLoggerFinder.java‎

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package com.baeldung.logging;
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public class CustomLoggerFinder extends System.LoggerFinder {
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@Override
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public System.Logger getLogger(String name, Module module) {
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return new ConsoleLogger();
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}
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}

‎core-java-9/src/modules/com.baeldung.logging/module-info.java‎

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module com.baeldung.logging {
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provides java.lang.System.LoggerFinder
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with com.baeldung.logging.CustomLoggerFinder;
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exports com.baeldung.logging;
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}

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