diff --git a/log4j-core-java9/pom.xml b/log4j-core-java9/pom.xml
new file mode 100644
index 00000000000..e05f30ef84f
--- /dev/null
+++ b/log4j-core-java9/pom.xml
@@ -0,0 +1,153 @@
+<?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>2.10.1-SNAPSHOT</version>
+    <relativePath>../</relativePath>
+  </parent>
+  <artifactId>log4j-core-java9</artifactId>
+  <packaging>pom</packaging>
+  <name>Apache Log4j Implementation Java 9 support</name>
+  <description>The Apache Log4j Implementation (Java 9)</description>
+  <properties>
+    <log4jParentDir>${basedir}/..</log4jParentDir>
+    <docLabel>Log4j Implementation Documentation</docLabel>
+    <projectDir>/core</projectDir>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-core</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-toolchains-plugin</artifactId>
+        <version>1.1</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>toolchain</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <toolchains>
+            <jdk>
+              <version>9</version>
+            </jdk>
+          </toolchains>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>default-compile</id>
+            <phase>compile</phase>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>default-test-compile</id>
+            <phase>test-compile</phase>
+            <goals>
+              <goal>testCompile</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <source>9</source>
+          <target>9</target>
+          <release>9</release>
+          <proc>none</proc>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <!-- Do not upgrade until https://issues.apache.org/jira/browse/SUREFIRE-720 is fixed -->
+        <version>2.13</version>
+        <executions>
+          <execution>
+            <id>test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>test</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <systemPropertyVariables>
+            <java.awt.headless>true</java.awt.headless>
+          </systemPropertyVariables>
+          <forkCount>2C</forkCount>
+          <reuseForks>true</reuseForks>
+          <includes>
+            <include>**/Test*.java</include>
+            <include>**/*Test.java</include>
+          </includes>
+          <excludes>
+            <exclude>**/*FuncTest.java</exclude>
+          </excludes>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>zip</id>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+            <configuration>
+              <finalName>log4j-core-java9-${project.version}</finalName>
+              <appendAssemblyId>false</appendAssemblyId>
+              <descriptors>
+                <descriptor>src/assembly/java9.xml</descriptor>
+              </descriptors>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-deploy-plugin</artifactId>
+        <version>${deploy.plugin.version}</version>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
+
diff --git a/log4j-core-java9/src/assembly/java9.xml b/log4j-core-java9/src/assembly/java9.xml
new file mode 100644
index 00000000000..3e595612db4
--- /dev/null
+++ b/log4j-core-java9/src/assembly/java9.xml
@@ -0,0 +1,51 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+<assembly>
+  <id>src</id>
+  <formats>
+    <format>zip</format>
+  </formats>
+  <baseDirectory>/</baseDirectory>
+  <fileSets>
+    <fileSet>
+      <directory>${project.build.outputDirectory}</directory>
+      <outputDirectory>/classes/META-INF/versions/9</outputDirectory>
+      <includes>
+        <include>**/*.class</include>
+      </includes>
+      <excludes>
+        <exclude>module-info.class</exclude>
+        <exclude>**/Dummy.class</exclude>
+        <exclude>**/spi/Provider.class</exclude>
+        <exclude>**/util/PropertySource.class</exclude>
+        <exclude>**/message/ThreadDumpMessage.class</exclude>
+        <exclude>**/message/ThreadDumpMessage$ThreadInfoFactory.class</exclude>
+      </excludes>
+    </fileSet>
+    <fileSet>
+      <directory>${project.build.outputDirectory}</directory>
+      <outputDirectory>/classes</outputDirectory>
+      <includes>
+        <include>module-info.class</include>
+      </includes>
+    </fileSet>
+  </fileSets>
+</assembly>
diff --git a/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Dummy.java b/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Dummy.java
new file mode 100644
index 00000000000..6bffac68c33
--- /dev/null
+++ b/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Dummy.java
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+package org.apache.logging.log4j.core.util;
+
+/**
+ * This is a dummy class and is only here to allow module-info.java to compile. It will not
+ * be copied into the log4j-api module.
+ */
+public class Dummy {
+}
diff --git a/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Temp.java b/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Temp.java
new file mode 100644
index 00000000000..edb6d4703f3
--- /dev/null
+++ b/log4j-core-java9/src/main/java/org/apache/logging/log4j/core/util/Temp.java
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+package org.apache.logging.log4j.core.util;
+
+/**
+ * Temporary class to ensure the log4j-core-java9 jar has at least one class (or Maven will refuse to proceed).
+ * To be removed as soon as real classes are added to the log4j-core-java9 module.
+ */
+public class Temp {
+}
diff --git a/log4j-core-java9/src/test/java/org/apache/logging/log4j/core/util/Dummy.java b/log4j-core-java9/src/test/java/org/apache/logging/log4j/core/util/Dummy.java
new file mode 100644
index 00000000000..6bffac68c33
--- /dev/null
+++ b/log4j-core-java9/src/test/java/org/apache/logging/log4j/core/util/Dummy.java
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+package org.apache.logging.log4j.core.util;
+
+/**
+ * This is a dummy class and is only here to allow module-info.java to compile. It will not
+ * be copied into the log4j-api module.
+ */
+public class Dummy {
+}
diff --git a/log4j-core/pom.xml b/log4j-core/pom.xml
index 49521f5393a..97a6892f3d5 100644
--- a/log4j-core/pom.xml
+++ b/log4j-core/pom.xml
@@ -38,6 +38,13 @@
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
     </dependency>
+    <!-- Classes and resources to be shaded into the core jar -->
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-core-java9</artifactId>
+      <scope>provided</scope>
+      <type>zip</type>
+    </dependency>
     <!-- Used for OSGi bundle support -->
     <dependency>
       <groupId>org.osgi</groupId>
@@ -342,6 +349,55 @@
   </dependencies>
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-dependency-plugin</artifactId>
+        <version>3.0.2</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-core-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>${project.build.directory}/log4j-core-java9</source>
+              </sources>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <executions>
diff --git a/pom.xml b/pom.xml
index 7ee72a40071..5582690f030 100644
--- a/pom.xml
+++ b/pom.xml
@@ -329,6 +329,12 @@
         <type>test-jar</type>
         <scope>test</scope>
       </dependency>
+      <dependency>
+        <groupId>org.apache.logging.log4j</groupId>
+        <artifactId>log4j-core-java9</artifactId>
+        <version>${project.version}</version>
+        <type>zip</type>
+      </dependency>
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>
         <artifactId>log4j-core</artifactId>
@@ -1296,6 +1302,7 @@
   <modules>
     <module>log4j-api-java9</module>
     <module>log4j-api</module>
+    <module>log4j-core-java9</module>
     <module>log4j-core</module>
     <module>log4j-core-its</module>
     <module>log4j-1.2-api</module>
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 868579fcb91..8cb729a6693 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -31,6 +31,9 @@
          - "remove" - Removed
     -->
     <release version="2.11.0" date="2018-xx-xx" description="GA Release 2.11.0">
+      <action issue="LOG4J2-2191" dev="rpopma" type="add">
+        Made log4j-core a multi-release ("multi-version") jar, added log4j-core-java9 module.
+      </action>
       <action issue="LOG4J2-2129" dev="rgoers" type="fix" due-to="Blazej Bucko">
         Log4j2 throws NoClassDefFoundError in Java 9 in java.util.ServiceLoader.
       </action>