Can't get jMAVSim to work

[Nico Llorens]

Hi guys,
I've been literally trying the whole weekend to get jMAVSim to work but it's been imposible (probably because of my very basic knowledge). When I try to execute the comand:
make px4_sitl jmavsim
I get px4 to start but then (if i'm not mistaken) it tries to open jMAVSim but this error occurs:
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.<init>(Window.java:537)
at java.awt.Frame.<init>(Frame.java:420)
at java.awt.Frame.<init>(Frame.java:385)
at javax.swing.JFrame.<init>(JFrame.java:189)
at me.drton.jmavsim.Visualizer3D.<init>(Visualizer3D.java:104)
at me.drton.jmavsim.Simulator.<init>(Simulator.java:157)
at me.drton.jmavsim.Simulator.main(Simulator.java:678)
... 5 more

Does anyone know how to fix this? I've tried so hard but I can't seem to get it working. Thanks in advanced

[Hamish Willee]

It probably isn't you. What setup instructions did you follow and to what platform? Are you running in a VM?

[Nico Llorens]

Hi, I've used this instructions. https://github.com/PX4/jMAVSim/blob/master/README.md But I couldn't get the comand ant create_copy_res working so I tried directly with the comand make px4_sitl jmavsim using the px4 developer guide. I'm using ubuntu, but not in a VM. El dom., 2 dic. 2018 22:39, Hamish Willee <[e-mail]> escribió:

…

It probably isn't you. What setup instructions did you follow and to what platform? Are you running in a VM? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#85 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/Arba0cN3qqKmk0tJqHpZdPsww6EiC4Jiks5u1EicgaJpZM4Y9kGj> .

[Hamish Willee]

The setup instructions here worked for me last time I tried on Ubuntu 16.04: http://dev.px4.io/en/setup/dev_env_linux.html (there are helper scripts there that install everything needed).

The problem is probably due to an incompatible Java installation.

Which is not to say that there isn't a problem - those README instructions should also be updated.

[Nico Llorens]

So what java should I be installing? I'm using java 8 because I saw in a discussion it worked well with the jMAVSim building process. El lun., 3 dic. 2018 7:17, Hamish Willee <[e-mail]> escribió:

…

The setup instructions here worked for me last time I tried on Ubuntu 16.04: http://dev.px4.io/en/setup/dev_env_linux.html (there are helper scripts there that install everything needed). The problem is probably due to an incompatible Java installation. Which is not to say that there isn't a problem - those README instructions should also be updated. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#85 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/Arba0ZaQ1SlNIWN1FI5Z-xxgZ8qX6dhNks5u1MIKgaJpZM4Y9kGj> .

[Hamish Willee]

OpenJDK8 according to to the docs: http://dev.px4.io/en/setup/dev_env_linux_ubuntu.html#jmavsim

[Nico Llorens]

Should I uninstall first the java version that i'm using now? El lun., 3 dic. 2018 7:28, Hamish Willee <[e-mail]> escribió:

…

OpenJDK8 according to to the docs: http://dev.px4.io/en/setup/dev_env_linux_ubuntu.html#jmavsim — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#85 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/Arba0ckO5VLv-If7MKIvI4Fc-WrBePbBks5u1MSMgaJpZM4Y9kGj> .

[Hamish Willee]

Probably. I just know what works as a turnkey installation on a clean ubuntu 16.04 machine.

[J4NSS3NS]

I saw different issues regarding java or wrong java versions on px4 builds Jmavsim.
I had different problems on Arch system but because system was used for trial and error I made fresh ubuntu 18 install.
I am unable to make it work, I did not save all of the error messages regarding Java because I just wanted px4 to work.

I noticed strange thing: I installed
nico@nico-MacBookPro:~$ sudo apt-get install ant openjdk-8-jdk openjdk-8-jre -y
went back i Terminal to check , because for Jmavsim prerequists those were needed....

After I sourced the ubuntu_sim.sh script, the Java version was

nico@nico-MacBookPro:~/src/Firmware$ java -version
openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3)
OpenJDK 64-Bit Server VM (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3, mixed mode, sharing)

Is it possible problems arise in reinstallating java through script file?

error now on my machine is :

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 (rsrc: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!