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[JAVA-41272] Moving some article links on Github - log4j (#18373)
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‎logging-modules/log4j/README.md

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- [Introduction to Java Logging](http://www.baeldung.com/java-logging-intro)
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- [Introduction to SLF4J](http://www.baeldung.com/slf4j-with-log4j2-logback)
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- [A Guide to Rolling File Appenders](http://www.baeldung.com/java-logging-rolling-file-appenders)
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- [Logging Exceptions Using SLF4J](https://www.baeldung.com/slf4j-log-exceptions)
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- [Log4j Warning: “No Appenders Could Be Found for Logger”](https://www.baeldung.com/log4j-no-appenders-found)
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- [A Guide to Log4j and the log4j.properties File in Java](https://www.baeldung.com/java-log4j-properties-guide)
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- [Log4j 2 Configuration Using a Properties File](https://www.baeldung.com/java-log4j2-config-with-prop-file)
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- [Get Log Output in JSON](http://www.baeldung.com/java-log-json-output)
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- [Intro to Log4j2 – Appenders, Layouts and Filters](http://www.baeldung.com/log4j2-appenders-layouts-filters)

‎logging-modules/log4j/pom.xml

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<artifactId>apache-log4j-extras</artifactId>
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<version>${log4j.version}</version>
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</dependency>
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<!--log4j2 dependencies -->
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-slf4j2-impl</artifactId>
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<version>${log4j-slf4j.version}</version>
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</dependency>
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<!--disruptor for log4j2 async logging -->
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<dependency>
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<groupId>com.lmax</groupId>
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<artifactId>disruptor</artifactId>
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<version>${disruptor.version}</version>
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</dependency>
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<!-- This is used by JSONLayout. -->
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!-- This is used by JDBC Appender. -->
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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<version>${h2.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-dbcp2</artifactId>
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<version>${commons-dbcp2.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<proc>none</proc>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>${maven-surefire-plugin.version}</version>
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<configuration>
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<systemPropertyVariables>
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<test.mime>json</test.mime>
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<logging.folder.path>${java.io.tmpdir}/${maven.build.timestamp}/logfile.json</logging.folder.path>
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</systemPropertyVariables>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<log4j-core.version>2.23.1</log4j-core.version>
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<log4j-api.version>2.23.1</log4j-api.version>
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<log4j-slf4j.version>2.23.1</log4j-slf4j.version>
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<commons-dbcp2.version>2.9.0</commons-dbcp2.version>
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<disruptor.version>3.3.6</disruptor.version>
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</properties>
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‎logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/consoleandfile/Log4j2ConsoleAndFile.java renamed to ‎logging-modules/log4j/src/main/java/com/baeldung/log4j2/Log4j2ConsoleAndFile.java

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package com.baeldung.logging.log4j2.consoleandfile;
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package com.baeldung.log4j2;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;

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

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<appender-ref ref="roll-by-time-and-size"/>
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</category>
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<logger name="com.baeldung.log4j.NoAppenderExample"/>
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<root>
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<level value="DEBUG"/>
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<appender-ref ref="stdout"/>

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

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appender.console.type = Console
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appender.console.name = STDOUT
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appender.console.layout.type = PatternLayout
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appender.console.layout.pattern = [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
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appender.file.type = File
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appender.file.name = LOGFILE
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appender.file.fileName=logs/log4j.log
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appender.file.layout.type=PatternLayout
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appender.file.layout.pattern=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
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appender.file.filter.threshold.type = ThresholdFilter
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appender.file.filter.threshold.level = info
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rootLogger=debug, STDOUT, LOGFILE

‎logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/tests/CustomLoggingIntegrationTest.java renamed to ‎logging-modules/log4j/src/test/java/com/baeldung/logging/log4j2/CustomLoggingIntegrationTest.java

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package com.baeldung.logging.log4j2.tests;
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package com.baeldung.logging.log4j2;
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import static org.junit.Assert.assertTrue;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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import com.baeldung.logging.log4j2.tests.jdbc.ConnectionFactory;
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import com.baeldung.logging.log4j2.jdbc.ConnectionFactory;
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@RunWith(JUnit4.class)
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public class CustomLoggingIntegrationTest {

‎logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/tests/JSONLayoutIntegrationTest.java renamed to ‎logging-modules/log4j/src/test/java/com/baeldung/logging/log4j2/JSONLayoutIntegrationTest.java

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package com.baeldung.logging.log4j2.tests;
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package com.baeldung.logging.log4j2;
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import static org.junit.Assert.assertTrue;
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import java.io.CharArrayWriter;
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import java.io.Writer;
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import com.baeldung.logging.log4j2.Log4j2BaseIntegrationTest;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.apache.logging.log4j.core.Appender;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.CharArrayWriter;
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import java.io.Writer;
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import static org.junit.Assert.assertTrue;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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public class JSONLayoutIntegrationTest extends Log4j2BaseIntegrationTest {
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‎logging-modules/log4j/src/test/java/com/baeldung/logging/log4j2/Log4j2BaseIntegrationTest.java

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package com.baeldung.logging.log4j2;
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import java.lang.reflect.Field;
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import org.apache.logging.log4j.core.config.ConfigurationFactory;
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import org.junit.AfterClass;
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public class Log4j2BaseIntegrationTest {
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@AfterClass
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public static void tearDown() throws Exception {
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Field factories = ConfigurationFactory.class.getDeclaredField("factories");
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factories.setAccessible(true);
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factories.set(null, null);
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ConfigurationFactory.resetConfigurationFactory();
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}
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}

‎logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/tests/jdbc/ConnectionFactory.java renamed to ‎logging-modules/log4j/src/test/java/com/baeldung/logging/log4j2/jdbc/ConnectionFactory.java

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package com.baeldung.logging.log4j2.tests.jdbc;
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import org.apache.commons.dbcp2.BasicDataSource;
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import org.h2.Driver;
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package com.baeldung.logging.log4j2.jdbc;
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import java.sql.Connection;
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import java.sql.SQLException;
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import org.apache.commons.dbcp2.BasicDataSource;
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import org.h2.Driver;
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public class ConnectionFactory {
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private interface Singleton {
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ConnectionFactory INSTANCE = new ConnectionFactory();

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

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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration xmlns:xi="http://www.w3.org/2001/XInclude"
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packages="com.baeldung" status="WARN">
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<Appenders>
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<Console name="ConsoleJSONAppender" target="SYSTEM_OUT">
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<JsonTemplateLayout eventTemplateUri="classpath:JsonLayout.json">
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<EventTemplateAdditionalField key="myCustomField" value="myCustomValue"/>
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</JsonTemplateLayout>
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</Console>
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<!-- <Syslog name="Syslog" format="RFC5424" host="localhost" port="514"
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protocol="TCP" facility="local3" connectTimeoutMillis="10000" reconnectionDelayMillis="5000"
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mdcId="mdc" includeMDC="true" /> <Failover name="FailoverAppender" primary="Syslog">
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<Failovers> <AppenderRef ref="ConsoleAppender" /> </Failovers> </Failover> -->
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<JDBC name="JDBCAppender" tableName="logs">
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<ConnectionFactory
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class="com.baeldung.logging.log4j2.tests.jdbc.ConnectionFactory"
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method="getConnection"/>
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<Column name="when" isEventTimestamp="true"/>
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<Column name="logger" pattern="%logger"/>
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<Column name="level" pattern="%level"/>
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<Column name="message" pattern="%message"/>
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<Column name="throwable" pattern="%ex{full}"/>
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</JDBC>
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</Appenders>
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<RollingFile name="XMLRollingfileAppender" fileName="target/logfile.xml"
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filePattern="target/logfile-%d{yyyy-MM-dd}-%i.log.gz">
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<XMLLayout/>
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<Policies>
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<SizeBasedTriggeringPolicy
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size="17 kB"/>
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</Policies>
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</RollingFile>
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<Loggers>
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<!-- <Logger name="FAIL_OVER_SYSLOG_APPENDER" level="INFO" additivity="false">
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<AppenderRef ref="FailoverAppender" /> </Logger> -->
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<Logger name="CONSOLE_JSON_APPENDER" level="TRACE"
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additivity="false">
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<AppenderRef ref="ConsoleJSONAppender"/>
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</Logger>
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<Logger name="XML_ROLLING_FILE_APPENDER" level="INFO"
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additivity="false">
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<AppenderRef ref="XMLRollingfileAppender"/>
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</Logger>
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</Loggers>
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</Configuration>

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