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When I run my JavaFX 11 application with the following command:

/usr/lib/jvm/java-11-openjdk-amd64/bin/java 
-p ~/.m2/repository/org/openjfx/javafx-swing/11/javafx-swing-11.jar:
~/.m2/repository/org/openjfx/javafx-swing/11/javafx-swing-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-graphics/11/javafx-graphics-11.jar:
~/.m2/repository/org/openjfx/javafx-graphics/11/javafx-graphics-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-base/11/javafx-base-11.jar:
~/.m2/repository/org/openjfx/javafx-base/11/javafx-base-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-controls/11/javafx-controls-11.jar:
~/.m2/repository/org/openjfx/javafx-controls/11/javafx-controls-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-media/11/javafx-media-11.jar:
~/.m2/repository/org/openjfx/javafx-media/11/javafx-media-11-linux.jar 
--add-modules javafx.controls,javafx.graphics
-classpath ~/development/intellij/OpenPatrician/OpenPatricianStandalone/target/classes:
~/.OpenPatrician/plugins/maps/MinimalMap-Plugin.jar:
~/development/intellij/OpenPatrician/OpenPatricianDisplay/target/classes:
~/.m2/repository/ch/sahits/sahitsUtil/1.2.4/sahitsUtil-1.2.4.jar:
~/.m2/repository/junit/junit/4.12/junit-4.12.jar:
~/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:
~/.m2/repository/org/springframework/boot/spring-boot-starter-log4j2/2.1.0.RELEASE/spring-boot-starter-log4j2-2.1.0.RELEASE.jar:
~/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.11.1/log4j-slf4j-impl-2.11.1.jar:
~/.m2/repository/org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar:
~/.m2/repository/org/apache/logging/log4j/log4j-api/2.11.1/log4j-api-2.11.1.jar:
~/.m2/repository/org/apache/logging/log4j/log4j-core/2.11.1/log4j-core-2.11.1.jar:
~/.m2/repository/org/apache/logging/log4j/log4j-jul/2.11.1/log4j-jul-2.11.1.jar:
~/.m2/repository/org/slf4j/jul-to-slf4j/1.7.25/jul-to-slf4j-1.7.25.jar:
~/.m2/repository/commons-cli/commons-cli/1.4/commons-cli-1.4.jar:
~/development/intellij/OpenPatrician/OpenPatricianImage/target/classes:
~/development/intellij/OpenPatrician/OpenPatricianModel/target/classes:
~/development/intellij/OpenPatrician/GameEvent/target/classes:
~/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.3.1/jaxb-runtime-2.3.1.jar:
~/.m2/repository/org/glassfish/jaxb/txw2/2.3.1/txw2-2.3.1.jar:
~/.m2/repository/com/sun/istack/istack-commons-runtime/3.0.7/istack-commons-runtime-3.0.7.jar:
~/.m2/repository/org/jvnet/staxex/stax-ex/1.8/stax-ex-1.8.jar:
~/.m2/repository/com/sun/xml/fastinfoset/FastInfoset/1.2.15/FastInfoset-1.2.15.jar:
~/.m2/repository/javax/activation/javax.activation-api/1.2.0/javax.activation-api-1.2.0.jar:
~/.m2/repository/org/openjfx/javafx-swing/11/javafx-swing-11.jar:
~/.m2/repository/org/openjfx/javafx-swing/11/javafx-swing-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-graphics/11/javafx-graphics-11.jar:
~/.m2/repository/org/openjfx/javafx-graphics/11/javafx-graphics-11-linux.jar:
~/.m2/repository/org/openjfx/javafx-base/11/javafx-base-11.jar:
~/.m2/repository/org/openjfx/javafx-base/11/javafx-base-11-linux.jar:
~/development/intellij/OpenPatrician/OpenPatricianSound/target/classes:
~/development/intellij/OpenPatrician/OpenPatricianUtilities/target/classes:
~/.m2/repository/org/springframework/spring-beans/5.1.2.RELEASE/spring-beans-5.1.2.RELEASE.jar:
~/.m2/repository/org/openjfx/javafx-controls/11/javafx-controls-11.jar:
~/.m2/repository/org/openjfx/javafx-controls/11/javafx-controls-11-linux.jar:
~/.m2/repository/commons-io/commons-io/2.6/commons-io-2.6.jar:
~/.m2/repository/com/thoughtworks/xstream/xstream/1.4.10/xstream-1.4.10.jar:
~/.m2/repository/xmlpull/xmlpull/1.1.3.1/xmlpull-1.1.3.1.jar:
~/.m2/repository/xpp3/xpp3_min/1.1.4c/xpp3_min-1.1.4c.jar:
~/.m2/repository/javax/xml/bind/jaxb-api/2.3.1/jaxb-api-2.3.1.jar:
~/.m2/repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar:
~/.m2/repository/org/openjfx/javafx-media/11/javafx-media-11.jar:
~/.m2/repository/org/openjfx/javafx-media/11/javafx-media-11-linux.jar:
~/.m2/repository/org/springframework/spring-context/5.1.2.RELEASE/spring-context-5.1.2.RELEASE.jar:
~/.m2/repository/org/springframework/spring-aop/5.1.2.RELEASE/spring-aop-5.1.2.RELEASE.jar:
~/.m2/repository/org/springframework/spring-expression/5.1.2.RELEASE/spring-expression-5.1.2.RELEASE.jar:
~/.m2/repository/org/springframework/spring-oxm/5.1.2.RELEASE/spring-oxm-5.1.2.RELEASE.jar:
~/.m2/repository/com/google/guava/guava/24.1-jre/guava-24.1-jre.jar:
~/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:
~/.m2/repository/org/checkerframework/checker-compat-qual/2.0.0/checker-compat-qual-2.0.0.jar:
~/.m2/repository/com/google/errorprone/error_prone_annotations/2.1.3/error_prone_annotations-2.1.3.jar:
~/.m2/repository/com/google/j2objc/j2objc-annotations/1.1/j2objc-annotations-1.1.jar:
~/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.14/animal-sniffer-annotations-1.14.jar:
~/development/intellij/OpenPatrician/OpenPatricianJavaFX/target/classes:
~/development/intellij/OpenPatrician/OpenPatricianGameEvent/target/classes:
~/development/intellij/OpenPatrician/OpenPatricianClientServerInterface/target/classes:
~/.m2/repository/org/springframework/boot/spring-boot-starter-aop/2.1.0.RELEASE/spring-boot-starter-aop-2.1.0.RELEASE.jar:
~/.m2/repository/org/springframework/boot/spring-boot-starter/2.1.0.RELEASE/spring-boot-starter-2.1.0.RELEASE.jar:
~/.m2/repository/org/yaml/snakeyaml/1.23/snakeyaml-1.23.jar:
~/.m2/repository/org/aspectj/aspectjweaver/1.9.2/aspectjweaver-1.9.2.jar:
~/development/intellij/OpenPatrician/OpenPatricianServer/target/classes:
~/development/intellij/OpenPatrician/OpenPatricianEngine/target/classes:
~/.m2/repository/com/carrotsearch/hppc/0.7.2/hppc-0.7.2.jar:
~/.m2/repository/org/springframework/spring-core/5.1.2.RELEASE/spring-core-5.1.2.RELEASE.jar:
~/.m2/repository/org/springframework/spring-jcl/5.1.2.RELEASE/spring-jcl-5.1.2.RELEASE.jar:
~/.m2/repository/org/reflections/reflections/0.9.11/reflections-0.9.11.jar:
~/.m2/repository/org/javassist/javassist/3.21.0-GA/javassist-3.21.0-GA.jar:
~/development/intellij/OpenPatrician/OpenPatricianData/target/classes:
~/.m2/repository/org/projectlombok/lombok/1.18.2/lombok-1.18.2.jar:
~/.m2/repository/org/springframework/boot/spring-boot-devtools/2.1.0.RELEASE/spring-boot-devtools-2.1.0.RELEASE.jar:
~/.m2/repository/org/springframework/boot/spring-boot/2.1.0.RELEASE/spring-boot-2.1.0.RELEASE.jar:
~/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.1.0.RELEASE/spring-boot-autoconfigure-2.1.0.RELEASE.jar 
ch.sahits.game.openpatrician.standalone.OpenPatricianApplication

I run into this error:

Exception in thread "JavaFX Application Thread" java.lang.IllegalAccessError: class com.sun.media.jfxmediaimpl.NativeMediaManager (in unnamed module @0x4d7be377) cannot access class com.sun.glass.utils.NativeLibLoader (in module javafx.graphics) because module javafx.graphics does not export com.sun.glass.utils to unnamed module @0x4d7be377
 at com.sun.media.jfxmediaimpl.NativeMediaManager.lambda$new$0(NativeMediaManager.java:136)
 at java.base/java.security.AccessController.doPrivileged(Native Method)
 at com.sun.media.jfxmediaimpl.NativeMediaManager.<init>(NativeMediaManager.java:107)
 at com.sun.media.jfxmediaimpl.NativeMediaManager$NativeMediaManagerInitializer.<clinit>(NativeMediaManager.java:78)
 at com.sun.media.jfxmediaimpl.NativeMediaManager.getDefaultInstance(NativeMediaManager.java:90)
 at com.sun.media.jfxmedia.MediaManager.canPlayProtocol(MediaManager.java:78)
 at com.sun.media.jfxmedia.locator.Locator.<init>(Locator.java:239)
 at com.sun.media.jfxmediaimpl.NativeMediaAudioClip.<init>(NativeMediaAudioClip.java:53)
 at com.sun.media.jfxmediaimpl.NativeMediaAudioClip.load(NativeMediaAudioClip.java:63)
 at com.sun.media.jfxmediaimpl.AudioClipProvider.load(AudioClipProvider.java:66)
 at com.sun.media.jfxmedia.AudioClip.load(AudioClip.java:135)
 at javafx.scene.media.AudioClip.<init>(AudioClip.java:83)
 at ch.sahits.game.openpatrician.sound.impl.LoopTrack.lambda$new$0(LoopTrack.java:26)
 at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
 at java.base/java.security.AccessController.doPrivileged(Native Method)
 at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
 at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
 at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
 at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
 at java.base/java.lang.Thread.run(Thread.java:834)

As I understand this exception there is something wrong with my module setup, but I am not clear what I need to change:

• Add additional modules to --add-modules and which?


• Add --add-opens to the command with which modules


• Something completely different?

JavaFX 11 is split into seven modules. In your command line you have:

--add-modules javafx.controls,javafx.graphics

And the error you're getting is:

java.lang.IllegalAccessError: class com.sun.media.jfxmediaimpl.NativeMediaManager (in unnamed module @0x4d7be377) cannot access class com.sun.glass.utils.NativeLibLoader (in module javafx.graphics) because module javafx.graphics does not export com.sun.glass.utils to unnamed module @0x4d7be377

It's telling you that a class, within the com.sun.media.jfxmediaimpl package, is in the unnamed module and is trying to access internal members of the javafx.graphics module. The name of the package indicates that it belongs to the javafx.media module. The error indicates, however, that you're using the javafx.media module from the classpath. You need to include javafx.media in the --add-modules command to use it from the modulepath:

--add-modules javafx.controls,javafx.graphics,javafx.media

On a related note, you don't need to include javafx.graphics in the command as you are already adding javafx.controls. Both javafx.controls and javafx.media require the javafx.graphics and javafx.base modules.