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[Tiago Stürmer Daitx <1579781@xxxxxxxxxxxxxxxxxx>]

OpenJDK 9 has not been released yet and it is based on a development
branch of OpenJDK, thus only use it if you know what you are doing. The
official OpenJDK is 8. I highly recommend you to uninstall OpenJDK 9 and
keep using OpenJDK 8.

With that out of the way, did forcing your system to use OpenJDK 8
through the alternatives systems fix your issue accessing /dev/ttyACM0?

If you are still having problems accessing /dev/ttyACM0 please detach
and attach your Arduino and then run

$ dmesg
$ ls -l /dev/ttyACM* /dev/ttyUSB*
$ groups

Look for USB messages right at the bottom of dmesg, they should indicate
if your Arduino was recognized and what device was associated to it. The
ls command will show you what user and group are associated with the
device (probably root/dialout) and groups will show you what groups you
belong to. In case you are not in the right group, please run

$ sudo usermod -a -G dialout <your username>

You need to logout and login again after adding yourself to a new group.

If you need help, please copy and paste the outputs here so I can take a
look. As an example, here is a dmesg output snip right after I plug an
Arduino:

[75244.850166] usb 1-3: new full-speed USB device number 50 using xhci_hcd
[75244.978703] usb 1-3: New USB device found, idVendor=067b, idProduct=2303
[75244.978706] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[75244.978708] usb 1-3: Product: USB-Serial Controller D
[75244.978710] usb 1-3: Manufacturer: Prolific Technology Inc. 
[75245.998601] usbcore: registered new interface driver usbserial
[75245.998620] usbcore: registered new interface driver usbserial_generic
[75245.998636] usbserial: USB Serial support registered for generic
[75246.000675] usbcore: registered new interface driver pl2303
[75246.000698] usbserial: USB Serial support registered for pl2303
[75246.000721] pl2303 1-3:1.0: pl2303 converter detected
[75246.001445] usb 1-3: pl2303 converter now attached to ttyUSB0

The last message indicates it has been associated to /dev/ttyUSB0. The
ls command shows

$ ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 May 11 10:38 /dev/ttyUSB0

And my permissions don't include dialout access (I'm not in the dialout
group):

$ groups
tdaitx adm cdrom sudo dip plugdev netdev libvirtd lpadmin sambashare vnstat sbuild lxd

-- 
You received this bug notification because you are a member of OpenJDK,
which is subscribed to openjdk-9 in Ubuntu.
https://bugs.launchpad.net/bugs/1579781

Title:
  librxtx-java fails to open /dev/ttyACM0 port!

Status in openjdk-9 package in Ubuntu:
  Incomplete

Bug description:
  In order to use librxtx-java to communicate with an arduino I have to
  use 1081 alternatives (OpenJDK 8 is 1081). In order to obtain this
  result I have installed galternatives and I have set for each j* voice
  the 1081 choice (in each place where it was present).

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: openjdk-9-jdk (not installed)
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Mon May  9 14:44:03 2016
  ErrorMessage: tentata sovrascrittura di "/usr/lib/jvm/java-9-openjdk-amd64/include/linux/jawt_md.h" presente anche nel pacchetto openjdk-9-jdk-headless:amd64 9~b114-0ubuntu1
  InstallationDate: Installed on 2016-04-28 (11 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.10ubuntu1
  SourcePackage: openjdk-9
  Title: package openjdk-9-jdk (not installed) failed to install/upgrade: tentata sovrascrittura di "/usr/lib/jvm/java-9-openjdk-amd64/include/linux/jawt_md.h" presente anche nel pacchetto openjdk-9-jdk-headless:amd64 9~b114-0ubuntu1
  UpgradeStatus: No upgrade log present (probably fresh install)

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