Merge branch 'master' of https://github.com/JonCook/tutorials

logging-modules/log4j/src/main/java/com/baeldung/log4j/Log4jExample.java

@@ -0,0 +1,17 @@
+package com.baeldung.log4j;
+
+
+import org.apache.log4j.Logger;
+
+public class Log4jExample {
+
+    private final static Logger logger = Logger.getLogger(Log4jExample.class);
+
+    public static void main(String[] args) {
+        logger.trace("Trace log message");
+        logger.debug("Debug log message");
+        logger.info("Info log message");
+        logger.error("Error log message");
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/log4j/Log4jRollingExample.java

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+package com.baeldung.log4j;
+
+import java.util.stream.IntStream;
+
+import org.apache.log4j.Logger;
+
+public class Log4jRollingExample {
+
+    private final static Logger logger = Logger.getLogger(Log4jRollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the " + i + " time I say 'Hello World'.");
+            Thread.sleep(100);
+        }
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/log4j2/Log4j2Example.java

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+package com.baeldung.log4j2;
+
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
+
+public class Log4j2Example {
+
+    private static final Logger logger = LogManager.getLogger(Log4j2Example.class);
+
+    public static void main(String[] args) {
+        logger.debug("Debug log message");
+        logger.info("Info log message");
+        logger.error("Error log message");
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/log4j2/Log4j2RollingExample.java

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+package com.baeldung.log4j2;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class Log4j2RollingExample {
+
+    private static final Logger logger = LogManager.getLogger(Log4j2RollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the {} time I say 'Hello World'.", i);
+            Thread.sleep(100);
+        }
+        LogManager.shutdown();
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/logback/LogbackExample.java

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+package com.baeldung.logback;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class LogbackExample {
+
+    private static final Logger logger = LoggerFactory.getLogger(LogbackExample.class);
+
+    public static void main(String[] args) {
+        logger.debug("Debug log message");
+        logger.info("Info log message");
+        logger.error("Error log message");
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/logback/LogbackRollingExample.java

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+package com.baeldung.logback;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.stream.IntStream;
+
+public class LogbackRollingExample {
+
+    private static final Logger logger = LoggerFactory.getLogger(LogbackRollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the {} time I say 'Hello World'.", i);
+            Thread.sleep(100);
+        }
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/slf4j/SLF4JLogExceptions.java

@@ -0,0 +1,16 @@
+package com.baeldung.slf4j;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SLF4JLogExceptions {
+
+    public static void main(String[] args) {
+        Logger logger = LoggerFactory.getLogger(SLF4JLogExceptions.class);
+
+        logger.error("An exception occurred!");
+        logger.error("An exception occurred!", new Exception("Custom exception"));
+        logger.error("{}, {}! An exception occurred!", "Hello", "World", new Exception("Custom exception"));
+    }
+
+}

logging-modules/log4j/src/main/java/com/baeldung/slf4j/Slf4jExample.java

@@ -0,0 +1,20 @@
+package com.baeldung.slf4j;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * To switch between logging frameworks you need only to uncomment needed framework dependencies in pom.xml
+ */
+public class Slf4jExample {
+    private static Logger logger = LoggerFactory.getLogger(Slf4jExample.class);
+
+    public static void main(String[] args) {
+        logger.debug("Debug log message");
+        logger.info("Info log message");
+        logger.error("Error log message");
+
+        String variable = "Hello John";
+        logger.debug("Printing variable value {} ", variable);
+    }
+}

logging-modules/log4j/src/main/java/com/baeldung/slf4j/Slf4jRollingExample.java

@@ -0,0 +1,19 @@
+package com.baeldung.slf4j;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.stream.IntStream;
+
+public class Slf4jRollingExample {
+
+    private static Logger logger = LoggerFactory.getLogger(Slf4jRollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the {} time I say 'Hello World'.", i);
+            Thread.sleep(100);
+        }
+    }
+
+}

logging-modules/log4j/src/main/resources/log4j.xml

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+<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
+<log4j:configuration debug="false">
+
+    <!--Console appender -->
+    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %p %m%n"/>
+        </layout>
+    </appender>
+
+    <!-- File appender -->
+    <appender name="fout" class="org.apache.log4j.FileAppender">
+        <param name="file" value="log4j/target/baeldung-log4j.log"/>
+        <param name="append" value="false"/>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %m%n"/>
+        </layout>
+    </appender>
+
+    <!-- Rolling appenders -->
+    <appender name="roll-by-size" class="org.apache.log4j.RollingFileAppender">
+        <param name="file" value="target/log4j/roll-by-size/app.log"/>
+        <param name="MaxFileSize" value="5KB"/>
+        <param name="MaxBackupIndex" value="2"/> <!-- It's one by default. -->
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %m%n"/>
+        </layout>
+    </appender>
+    <appender name="roll-by-size-2" class="org.apache.log4j.RollingFileAppender">
+        <param name="file" value="target/log4j/roll-by-size-2/app.log"/>
+        <param name="MaxFileSize" value="5KB"/>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %m%n"/>
+        </layout>
+    </appender>
+    <appender name="roll-by-window"
+        class="org.apache.log4j.rolling.RollingFileAppender">
+        <rollingPolicy
+            class="org.apache.log4j.rolling.FixedWindowRollingPolicy">
+            <param name="ActiveFileName" value="target/log4j/roll-by-window/app.log"/>
+            <param name="FileNamePattern"
+                value="target/log4j/roll-by-window/app.%i.log.gz"/>
+            <param name="MinIndex" value="7"/>
+            <param name="MaxIndex" value="17"/>
+        </rollingPolicy>
+        <triggeringPolicy
+            class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
+            <param name="MaxFileSize" value="50000"/>
+        </triggeringPolicy>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %m%n"/>
+        </layout>
+    </appender>
+    <appender name="roll-by-time"
+        class="org.apache.log4j.rolling.RollingFileAppender">
+        <rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
+            <param name="FileNamePattern"
+                value="target/log4j/roll-by-time/app.%d{HH-mm}.log.gz"/>
+        </rollingPolicy>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p - %m%n"/>
+        </layout>
+    </appender>
+    <appender name="roll-by-time-and-size"
+        class="org.apache.log4j.rolling.RollingFileAppender">
+        <rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
+            <param name="FileNamePattern"
+                value="target/log4j/roll-by-time-and-size/app.%d{HH-mm}.%i.log.gz"/>
+        </rollingPolicy>
+        <triggeringPolicy
+            class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
+            <param name="MaxFileSize" value="50000"/>
+        </triggeringPolicy>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p - %m%n"/>
+        </layout>
+    </appender>
+
+    <!--Override log level for specified package -->
+    <category name="com.baeldung.log4j">
+        <priority value="TRACE"/>
+    </category>
+
+    <category name="com.baeldung.log4j.Log4jRollingExample">
+        <priority value="TRACE"/>
+        <appender-ref ref="roll-by-size"/>
+        <appender-ref ref="roll-by-size-2"/>
+        <appender-ref ref="roll-by-window"/>
+        <appender-ref ref="roll-by-time"/>
+        <appender-ref ref="roll-by-time-and-size"/>
+    </category>
+
+    <root>
+        <level value="DEBUG"/>
+        <appender-ref ref="stdout"/>
+        <appender-ref ref="fout"/>
+    </root>
+
+</log4j:configuration>

logging-modules/log4j/src/main/resources/log4j2.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="INFO">
+    <Appenders>
+        # Console appender
+        <Console name="stdout" target="SYSTEM_OUT">
+            # Pattern of log message for console appender
+            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %p %m%n"/>
+        </Console>
+
+        # File appender
+        <File name="fout" fileName="log4j/target/baeldung-log4j2.log"
+            immediateFlush="false" append="false">
+            # Pattern of log message for file appender
+            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %p %m%n"/>
+        </File>
+
+        # Rolling appender
+        <RollingFile name="roll-by-size"
+            fileName="target/log4j2/roll-by-size/app.log" filePattern="target/log4j2/roll-by-size/app.%i.log.gz"
+            ignoreExceptions="false">
+            <PatternLayout>
+                <Pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</Pattern>
+            </PatternLayout>
+            <Policies>
+                <OnStartupTriggeringPolicy/>
+                <SizeBasedTriggeringPolicy
+                    size="5 KB"/>
+            </Policies>
+        </RollingFile>
+
+        <RollingFile name="roll-by-time"
+            fileName="target/log4j2/roll-by-time/app.log"
+            filePattern="target/log4j2/roll-by-time/app.%d{MM-dd-yyyy-HH-mm}.log.gz"
+            ignoreExceptions="false">
+            <PatternLayout>
+                <Pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</Pattern>
+            </PatternLayout>
+            <TimeBasedTriggeringPolicy/>
+        </RollingFile>
+
+        <RollingFile name="roll-by-time-and-size"
+            fileName="target/log4j2/roll-by-time-and-size/app.log"
+            filePattern="target/log4j2/roll-by-time-and-size/app.%d{MM-dd-yyyy-HH-mm}.%i.log.gz"
+            ignoreExceptions="false">
+            <PatternLayout>
+                <Pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</Pattern>
+            </PatternLayout>
+            <Policies>
+                <OnStartupTriggeringPolicy/>
+                <SizeBasedTriggeringPolicy
+                    size="5 KB"/>
+                <TimeBasedTriggeringPolicy/>
+            </Policies>
+            <DefaultRolloverStrategy>
+                <Delete basePath="${baseDir}" maxDepth="2">
+                    <IfFileName
+                        glob="target/log4j2/roll-by-time-and-size/app.*.log.gz"/>
+                    <IfLastModified age="20s"/>
+                </Delete>
+            </DefaultRolloverStrategy>
+        </RollingFile>
+    </Appenders>
+
+    <Loggers>
+        # Override log level for specified package
+        <Logger name="com.baeldung.log4j2" level="TRACE"/>
+
+        <Logger name="com.baeldung.log4j2.Log4j2RollingExample"
+            level="TRACE">
+            <AppenderRef ref="roll-by-size"/>
+            <AppenderRef ref="roll-by-time"/>
+            <AppenderRef ref="roll-by-time-and-size"/>
+        </Logger>
+
+        <AsyncRoot level="DEBUG">
+            <AppenderRef ref="stdout"/>
+            <AppenderRef ref="fout"/>
+        </AsyncRoot>
+    </Loggers>
+</Configuration>

logging-modules/log4j/src/main/resources/logback.xml

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+<configuration>
+    # Console appender
+    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
+        <layout class="ch.qos.logback.classic.PatternLayout">
+            # Pattern of log message for console appender
+            <Pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</Pattern>
+        </layout>
+    </appender>
+
+    # File appender
+    <appender name="fout" class="ch.qos.logback.core.FileAppender">
+        # Name of a log file
+        <file>log4j/target/baeldung-logback.log</file>
+        <append>false</append>
+        <encoder>
+            # Pattern of log message for file appender
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</pattern>
+        </encoder>
+    </appender>
+
+    # Rolling appenders
+    <appender name="roll-by-size"
+        class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>target/slf4j/roll-by-size/app.log</file>
+        <rollingPolicy
+            class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
+            <fileNamePattern>target/slf4j/roll-by-size/app.%i.log.zip
+            </fileNamePattern>
+            <minIndex>1</minIndex>
+            <maxIndex>3</maxIndex>
+            <totalSizeCap>1MB</totalSizeCap>
+        </rollingPolicy>
+        <triggeringPolicy
+            class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
+            <maxFileSize>5KB</maxFileSize>
+        </triggeringPolicy>
+        <encoder>
+            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <appender name="roll-by-time"
+        class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>target/slf4j/roll-by-time/app.log</file>
+        <rollingPolicy
+            class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>target/slf4j/roll-by-time/app.%d{yyyy-MM-dd-HH-mm}.log.zip
+            </fileNamePattern>
+            <maxHistory>20</maxHistory>
+            <totalSizeCap>1MB</totalSizeCap>
+        </rollingPolicy>
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="roll-by-time-and-size"
+        class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>target/slf4j/roll-by-time-and-size/app.log</file>
+        <rollingPolicy
+            class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
+            <fileNamePattern>target/slf4j/roll-by-time-and-size/app.%d{yyyy-MM-dd-mm}.%i.log.zip
+            </fileNamePattern>
+            <maxFileSize>5KB</maxFileSize>
+            <maxHistory>20</maxHistory>
+            <totalSizeCap>1MB</totalSizeCap>
+        </rollingPolicy>
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %p %m%n</pattern>
+        </encoder>
+    </appender>
+
+    # Override log level for specified package
+    <logger name="com.baeldung.slf4j.Slf4jRollingExample" level="TRACE">
+        <appender-ref ref="roll-by-size"/>
+        <appender-ref ref="roll-by-time"/>
+        <appender-ref ref="roll-by-time-and-size"/>
+    </logger>
+
+    <root level="INFO">
+        <appender-ref ref="stdout"/>
+        <appender-ref ref="fout"/>
+    </root>
+</configuration>