diff --git a/pmd-ui/pom.xml b/pmd-ui/pom.xml
index 7a682c1d2e..8f83d13b5c 100644
--- a/pmd-ui/pom.xml
+++ b/pmd-ui/pom.xml
@@ -16,6 +16,9 @@
         <maven.compiler.source>1.${java.version}</maven.compiler.source>
         <maven.compiler.target>1.${java.version}</maven.compiler.target>
 
+        <build.mr.java8.output>${project.build.directory}/classes-java8</build.mr.java8.output>
+
+
         <openjfx.version>11</openjfx.version>
     </properties>
 
@@ -61,6 +64,57 @@
                     </rulesets>
                 </configuration>
             </plugin>
+
+            <!-- Unpack Java 8 specific code into the root output dir -->
+            <!-- Code specific to higher versions is unpacked into META-INF/versions/n -->
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>Unpack java 8 specific deps</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>unpack</goal>
+                        </goals>
+                        <configuration>
+                            <artifact>org.controlsfx:controlsfx:8.40.13</artifact>
+                            <outputDirectory>${project.build.outputDirectory}</outputDirectory>
+                            <includes>**/*</includes>
+                            <excludes>MANIFEST.MF</excludes>
+                        </configuration>
+                    </execution>
+
+                    <execution>
+                        <id>Unpack java 9 specific deps</id>
+                        <phase>generate-resources</phase>
+                        <goals>
+                            <goal>unpack</goal>
+                        </goals>
+                        <configuration>
+                            <artifact>org.controlsfx:controlsfx:9.0.0</artifact>
+                            <outputDirectory>${project.build.outputDirectory}/META-INF/versions/9</outputDirectory>
+                            <includes>**/*</includes>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifestEntries>
+                            <!-- Important for it to work on JRE 9+ -->
+                            <Multi-Release>true</Multi-Release>
+                            <Main-Class>net.sourceforge.pmd.util.fxdesigner.DesignerStarter</Main-Class>
+                        </manifestEntries>
+                    </archive>
+                    <finalName>pmd-ui</finalName>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -115,9 +169,12 @@
             <version>0.9.2</version>
         </dependency>
         <dependency>
+            <!-- That one is "provided" because several versions are unpacked into versioned dirs -->
+            <!-- to create a multi-release jar. -->
             <groupId>org.controlsfx</groupId>
             <artifactId>controlsfx</artifactId>
             <version>8.40.13</version>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>commons-beanutils</groupId>