jMAVsim fails with Java 11

[louzq16]

hello everyone!
I tried to run jMAVsim on ubuntu18.04,but it failed to start GUI,
this is the message：

louzq@louzq-HP-Pavilion-Power-Laptop-15-cb0xx:~/src/Firmware/Tools/jMAVSim$ java -cp lib/*:out/production/jmavsim.jar me.drton.jmavsim.Simulator
Options parsed, starting Sim.
Starting GUI...
3D [dev] 1.6.0-pre12-daily-experimental daily

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by javax.media.j3d.JoglPipeline (file:/home/louzq/src/Firmware/Tools/jMAVSim/lib/j3dcore.jar) to method sun.awt.AppContext.getAppContext()
WARNING: Please consider reporting this to the maintainers of javax.media.j3d.JoglPipeline
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Inconsistency detected by ld.so: dl-lookup.c: 111: check_match: Assertion `version->filename == NULL || ! _dl_name_match_p (version->filename, map)' failed!

how to solve this problem

[Ahmad-Drak]

Same issue. Did you manage to fix it?

[Stifael]

same issue

[Stifael]

I assume you upgraded java version.
In case you have openjdk 11 (java --version), I would downgrade to 10 or 9. There was already a fix for 9/10, but not for 11 (cb2d130).

To downgrade your version:

• download jdk-10 from here
• unzip

tar xzvf openjdk-10_linux-x64_bin.tar.gz

• move jdk-10 to install directory and update version to 10.

sudo mkdir -p /usr/lib/jvm/java-10-openjdk-amd64/
sudo mv jdk-10 /usr/lib/jvm/java-10-openjdk-amd64/
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-10-openjdk-amd64/jdk-10/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-10-openjdk-amd64/jdk-10/bin/javac 1
sudo update-alternatives --config java

• remove jmavsim build folder

rm -rf <path-to-px4>/Tools/jMAVSim/out

Now you should have your GUI back.

NOTE: this is just a workaround and not a fix.

[Ahmad-Drak]

Thanks for the workaround, will git it a try

[Ahmad-Drak]

@Stifael jdk-10 didnt work for me, however jdk-9 did work. Thanks for the help

[louzq16]

I assume you upgraded java version.
In case you have openjdk 11 (java --version), I would downgrade to 10 or 9. There was already a fix for 9/10, but not for 11 (cb2d130).

To downgrade your version:

• download jdk-10 from here
• unzip

tar xzvf openjdk-10_linux-x64_bin.tar.gz

• move jdk-10 to install directory and update version to 10.

sudo mkdir -p /usr/lib/jvm/java-10-openjdk-amd64/
sudo mv jdk-10 /usr/lib/jvm/java-10-openjdk-amd64/
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-10-openjdk-amd64/jdk-10/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-10-openjdk-amd64/jdk-10/bin/javac 1
sudo update-alternatives --config java

• remove jmavsim build folder

rm -rf <path-to-px4>/Tools/jMAVSim/out

Now you should have your GUI back.

NOTE: this is just a workaround and not a fix.
thank you for your help!! It works well now~

[julianoes]

For Ubuntu, you can fall back to Java 8 quite easily:

sudo apt install openjdk-8-jdk
sudo update-alternatives --config java # choose 8
rm -rf Tools/jMAVSim/out

[yuhaim]

For Ubuntu, you can fall back to Java 8 quite easily:

sudo apt install openjdk-8-jdk
sudo update-alternatives --config java # choose 8
rm -rf Tools/jMAVSim/out

This solution works for me finally, but there is another issue as follow:

Options parsed, starting Sim.
Starting GUI...
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:61)
Caused by: java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper
at java.awt.Toolkit.loadAssistiveTechnologies(Toolkit.java:807)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:886)
at java.awt.Window.getToolkit(Window.java:1358)
at java.awt.Window.init(Window.java:506)
at java.awt.Window.(Window.java:537)
at java.awt.Frame.(Frame.java:420)
at java.awt.Frame.(Frame.java:385)
at javax.swing.JFrame.(JFrame.java:189)
at me.drton.jmavsim.Visualizer3D.(Visualizer3D.java:107)
at me.drton.jmavsim.Simulator.(Simulator.java:176)
at me.drton.jmavsim.Simulator.main(Simulator.java:895)
... 5 more

This could be solved by https://askubuntu.com/questions/695560/assistive-technology-not-found-awterror

[julianoes]

Thanks for adding that, also see: PX4/PX4-Autopilot#9557 (comment)