You can download log4j-api-2.9.1.jar in this page.
Apache License
log4j-api-2.9.1.jar file has the following types.
META-INF.versions.9.org.apache.logging.log4j.util.ProcessIdUtil.class META-INF.versions.9.org.apache.logging.log4j.util.StackLocator.class META-INF/DEPENDENCIES META-INF/LICENSE META-INF/MANIFEST.MF META-INF/NOTICE META-INF/maven/org.apache.logging.log4j/log4j-api/pom.properties META-INF/maven/org.apache.logging.log4j/log4j-api/pom.xml org.apache.logging.log4j.CloseableThreadContext.class org.apache.logging.log4j.EventLogger.class org.apache.logging.log4j.Level.class org.apache.logging.log4j.LogManager.class org.apache.logging.log4j.Logger.class org.apache.logging.log4j.LoggingException.class org.apache.logging.log4j.Marker.class org.apache.logging.log4j.MarkerManager.class org.apache.logging.log4j.ThreadContext.class org.apache.logging.log4j.message.AbstractMessageFactory.class org.apache.logging.log4j.message.AsynchronouslyFormattable.class org.apache.logging.log4j.message.BasicThreadInformation.class org.apache.logging.log4j.message.DefaultFlowMessageFactory.class org.apache.logging.log4j.message.EntryMessage.class org.apache.logging.log4j.message.ExitMessage.class org.apache.logging.log4j.message.FlowMessage.class org.apache.logging.log4j.message.FlowMessageFactory.class org.apache.logging.log4j.message.FormattedMessage.class org.apache.logging.log4j.message.FormattedMessageFactory.class org.apache.logging.log4j.message.LocalizedMessage.class org.apache.logging.log4j.message.LocalizedMessageFactory.class org.apache.logging.log4j.message.LoggerNameAwareMessage.class org.apache.logging.log4j.message.MapMessage.class org.apache.logging.log4j.message.Message.class org.apache.logging.log4j.message.MessageCollectionMessage.class org.apache.logging.log4j.message.MessageFactory.class org.apache.logging.log4j.message.MessageFactory2.class org.apache.logging.log4j.message.MessageFormatMessage.class org.apache.logging.log4j.message.MessageFormatMessageFactory.class org.apache.logging.log4j.message.MultiformatMessage.class org.apache.logging.log4j.message.ObjectArrayMessage.class org.apache.logging.log4j.message.ObjectMessage.class org.apache.logging.log4j.message.ParameterFormatter.class org.apache.logging.log4j.message.ParameterizedMessage.class org.apache.logging.log4j.message.ParameterizedMessageFactory.class org.apache.logging.log4j.message.ParameterizedNoReferenceMessageFactory.class org.apache.logging.log4j.message.ReusableMessage.class org.apache.logging.log4j.message.ReusableMessageFactory.class org.apache.logging.log4j.message.ReusableObjectMessage.class org.apache.logging.log4j.message.ReusableParameterizedMessage.class org.apache.logging.log4j.message.ReusableSimpleMessage.class org.apache.logging.log4j.message.SimpleMessage.class org.apache.logging.log4j.message.SimpleMessageFactory.class org.apache.logging.log4j.message.StringFormattedMessage.class org.apache.logging.log4j.message.StringFormatterMessageFactory.class org.apache.logging.log4j.message.StringMapMessage.class org.apache.logging.log4j.message.StructuredDataCollectionMessage.class org.apache.logging.log4j.message.StructuredDataId.class org.apache.logging.log4j.message.StructuredDataMessage.class org.apache.logging.log4j.message.ThreadDumpMessage.class org.apache.logging.log4j.message.ThreadInformation.class org.apache.logging.log4j.message.TimestampMessage.class org.apache.logging.log4j.simple.SimpleLogger.class org.apache.logging.log4j.simple.SimpleLoggerContext.class org.apache.logging.log4j.simple.SimpleLoggerContextFactory.class org.apache.logging.log4j.spi.AbstractLogger.class org.apache.logging.log4j.spi.AbstractLoggerAdapter.class org.apache.logging.log4j.spi.CleanableThreadContextMap.class org.apache.logging.log4j.spi.CopyOnWrite.class org.apache.logging.log4j.spi.CopyOnWriteSortedArrayThreadContextMap.class org.apache.logging.log4j.spi.DefaultThreadContextMap.class org.apache.logging.log4j.spi.DefaultThreadContextStack.class org.apache.logging.log4j.spi.ExtendedLogger.class org.apache.logging.log4j.spi.ExtendedLoggerWrapper.class org.apache.logging.log4j.spi.GarbageFreeSortedArrayThreadContextMap.class org.apache.logging.log4j.spi.LoggerAdapter.class org.apache.logging.log4j.spi.LoggerContext.class org.apache.logging.log4j.spi.LoggerContextFactory.class org.apache.logging.log4j.spi.LoggerContextKey.class org.apache.logging.log4j.spi.LoggerRegistry.class org.apache.logging.log4j.spi.MessageFactory2Adapter.class org.apache.logging.log4j.spi.MutableThreadContextStack.class org.apache.logging.log4j.spi.NoOpThreadContextMap.class org.apache.logging.log4j.spi.ObjectThreadContextMap.class org.apache.logging.log4j.spi.Provider.class org.apache.logging.log4j.spi.ReadOnlyThreadContextMap.class org.apache.logging.log4j.spi.StandardLevel.class org.apache.logging.log4j.spi.Terminable.class org.apache.logging.log4j.spi.ThreadContextMap.class org.apache.logging.log4j.spi.ThreadContextMap2.class org.apache.logging.log4j.spi.ThreadContextMapFactory.class org.apache.logging.log4j.spi.ThreadContextStack.class org.apache.logging.log4j.status.StatusConsoleListener.class org.apache.logging.log4j.status.StatusData.class org.apache.logging.log4j.status.StatusListener.class org.apache.logging.log4j.status.StatusLogger.class org.apache.logging.log4j.util.Activator.class org.apache.logging.log4j.util.BiConsumer.class org.apache.logging.log4j.util.Chars.class org.apache.logging.log4j.util.Constants.class org.apache.logging.log4j.util.EnglishEnums.class org.apache.logging.log4j.util.IndexedReadOnlyStringMap.class org.apache.logging.log4j.util.IndexedStringMap.class org.apache.logging.log4j.util.LambdaUtil.class org.apache.logging.log4j.util.LoaderUtil.class org.apache.logging.log4j.util.LowLevelLogUtil.class org.apache.logging.log4j.util.MessageSupplier.class org.apache.logging.log4j.util.PerformanceSensitive.class org.apache.logging.log4j.util.ProcessIdUtil.class org.apache.logging.log4j.util.PropertiesUtil.class org.apache.logging.log4j.util.ProviderUtil.class org.apache.logging.log4j.util.ReadOnlyStringMap.class org.apache.logging.log4j.util.SortedArrayStringMap.class org.apache.logging.log4j.util.StackLocator.class org.apache.logging.log4j.util.StackLocatorUtil.class org.apache.logging.log4j.util.StringBuilderFormattable.class org.apache.logging.log4j.util.StringBuilders.class org.apache.logging.log4j.util.StringMap.class org.apache.logging.log4j.util.Strings.class org.apache.logging.log4j.util.Supplier.class org.apache.logging.log4j.util.TriConsumer.class org.apache.logging.log4j.util.Unbox.class
log4j-api-2.9.1.pom file content.
<?xml version="1.0" encoding="UTF-8"?>
<!--
~ Licensed to the Apache Software Foundation (ASF) under one or more
~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to You under the Apache license, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the license for the specific language governing permissions and
~ limitations under the license.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j</artifactId>
<version>2.9.1</version>
<relativePath>../</relativePath>
</parent>
<artifactId>log4j-api</artifactId>
<packaging>jar</packaging>
<name>Apache Log4j API</name>
<description>The Apache Log4j API</description>
<properties>
<log4jParentDir>${basedir}/..</log4jParentDir>
<docLabel>API Documentation</docLabel>
<projectDir>/api</projectDir>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api-java9</artifactId>
<scope>provided</scope>
<type>zip</type>
</dependency>
<!-- Place Felix before Equinox because Felix is signed. / also place it before org.osgi.core so that its versions of the OSGi classes are used -->
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.framework</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.eclipse.tycho</groupId>
<artifactId>org.eclipse.osgi</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<scope>test</scope>
</dependency>
<!-- Required for JSON support -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<scope>test</scope>
</dependency>
<!-- Required for JSON support -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.0.1</version>
<executions>
<execution>
<id>unpack-classes</id>
<phase>prepare-package</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api-java9</artifactId>
<version>${project.version}</version>
<type>zip</type>
<overWrite>false</overWrite>
</artifactItem>
</artifactItems>
<includes>**/*.class</includes>
<excludes>**/*.java</excludes>
<outputDirectory>${project.build.directory}</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>true</overWriteSnapshots>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/log4j-api-java9</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>default-compile</id>
<!-- recompile everything for target VM except the module-info.java -->
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<forkCount>2C</forkCount>
<reuseForks>true</reuseForks>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifestFile>${manifestfile}</manifestFile>
<manifestEntries>
<Specification-Title>${project.name}</Specification-Title>
<Specification-Version>${project.version}</Specification-Version>
<Specification-Vendor>${project.organization.name}</Specification-Vendor>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-Version>${project.version}</Implementation-Version>
<Implementation-Vendor>${project.organization.name}</Implementation-Vendor>
<Implementation-Vendor-Id>org.apache</Implementation-Vendor-Id>
<X-Compile-Source-JDK>${maven.compiler.source}</X-Compile-Source-JDK>
<X-Compile-Target-JDK>${maven.compiler.target}</X-Compile-Target-JDK>
<Multi-Release>true</Multi-Release>
</manifestEntries>
</archive>
</configuration>
<executions>
<execution>
<goals>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Include the standard NOTICE and LICENSE -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-remote-resources-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<configuration>
<skip>false</skip>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<configuration>
<instructions>
<Export-Package>org.apache.logging.log4j.*</Export-Package>
<Import-Package>
sun.reflect;resolution:=optional,
org.apache.logging.log4j.core.osgi;resolution:=optional,
org.apache.logging.log4j.core.util;resolution:=optional,
org.apache.logging.log4j.core.async;resolution:=optional,
*
</Import-Package>
<Bundle-Activator>org.apache.logging.log4j.util.Activator</Bundle-Activator>
</instructions>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>clirr-maven-plugin</artifactId>
<version>${clirr.plugin.version}</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-changes-plugin</artifactId>
<version>${changes.plugin.version}</version>
<reportSets>
<reportSet>
<reports>
<report>changes-report</report>
</reports>
</reportSet>
</reportSets>
<configuration>
<issueLinkTemplate>%URL%/show_bug.cgi?id=%ISSUE%</issueLinkTemplate>
<useJql>true</useJql>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>${checkstyle.plugin.version}</version>
<configuration>
<!--<propertiesLocation>${vfs.parent.dir}/checkstyle.properties</propertiesLocation> -->
<configLocation>${log4jParentDir}/checkstyle.xml</configLocation>
<suppressionsLocation>${log4jParentDir}/checkstyle-suppressions.xml</suppressionsLocation>
<enableRulesSummary>false</enableRulesSummary>
<propertyExpansion>basedir=${basedir}</propertyExpansion>
<propertyExpansion>licensedir=${log4jParentDir}/checkstyle-header.txt</propertyExpansion>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>${javadoc.plugin.version}</version>
<configuration>
<bottom><![CDATA[<p align="center">Copyright © {inceptionYear}-{currentYear} {organizationName}. All Rights Reserved.<br />
Apache Logging, Apache Log4j, Log4j, Apache, the Apache feather logo, the Apache Logging project logo,
and the Apache Log4j logo are trademarks of The Apache Software Foundation.</p>]]></bottom>
<!-- module link generation is completely broken in the javadoc plugin for a multi-module non-aggregating
project -->
<detectOfflineLinks>false</detectOfflineLinks>
<linksource>true</linksource>
<links>
<link>http://www.osgi.org/javadoc/r4v43/core/</link>
</links>
</configuration>
<reportSets>
<reportSet>
<id>non-aggregate</id>
<reports>
<report>javadoc</report>
</reports>
</reportSet>
</reportSets>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>${findbugs.plugin.version}</version>
<configuration>
<fork>true</fork>
<jvmArgs>-Duser.language=en</jvmArgs>
<threshold>Normal</threshold>
<effort>Default</effort>
<excludeFilterFile>${log4jParentDir}/findbugs-exclude-filter.xml</excludeFilterFile>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jxr-plugin</artifactId>
<version>${jxr.plugin.version}</version>
<reportSets>
<reportSet>
<id>non-aggregate</id>
<reports>
<report>jxr</report>
</reports>
</reportSet>
<reportSet>
<id>aggregate</id>
<reports>
<report>aggregate</report>
</reports>
</reportSet>
</reportSets>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>${pmd.plugin.version}</version>
<configuration>
<targetJdk>${maven.compiler.target}</targetJdk>
</configuration>
</plugin>
</plugins>
</reporting>
</project>
<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.9.1</version> </dependency>
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Download log4j-api-2.9.1.jar file