arduino serial monitor fails: ... java.lang.NoClassDefFoundError: jssc.SerialPortEventListener

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1

Hi all
I use OS 15.3, updated as of latest with zypper ref && zypper up.
Arduino 1.8.19-lp153.2.1 is installed from obs://build.opensuse.org/CrossToolchain:avr
jssc 2.8.0-lp153.8.1 also from obs://build.opensuse.org/CrossToolchain:avr

I write, compile/verify and upload skteches to an arduino uno R3 w/o problems. Now I’d like to attach an lcd to the uno. Verified, I got the correct libraries and also the peoper wireing for good. No mistake there. Need to get the adress of the LCD, I follow https://funduino.de/nr-06-zwei-i²c-displays-gleichzeitig , copied the code indicated and pasted it into a new sketch. Compile/verify and upload: no problem. But as soon as I try to open the serial monitor, I get:


Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: jssc.SerialPortEventListener
    at java.lang.ClassLoader.defineClassImpl(Native Method)
    at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:397)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:358)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:682)
    at java.net.URLClassLoader.access$400(URLClassLoader.java:89)
    at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1086)
    at java.security.AccessController.doPrivileged(AccessController.java:774)....

I found this where they say, that

So perhaps there is a problem with your .jssc directory, or perhaps
there is an incorrect or old version in there (that is missing some
symbols?).

They also say:

If ~/.jssc does not exist then arduino creates and populates it.

Which is not true on my box.

cd ~ 
ls .jss*
access no possible, file or directory not found.

How can I get the arduino serial monitor working?

Help greatly appreciated

greez
chris

2

First thing is to check if/how the serial is connected.

If I issue “dmesg --follow” and I connect my Adafruit Feather Mo via USB, it lists:

 3260.978549] usb 2-3: new full-speed USB device number 11 using xhci_hcd 
 3261.137323] usb 2-3: New USB device found, idVendor=239a, idProduct=800b, bcdDevice= 1.00 
 3261.137342] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 
 3261.137349] usb 2-3: Product: Feather M0 
 3261.137355] usb 2-3: Manufacturer: Adafruit 
 3261.159356] cdc_acm 2-3:1.0: ttyACM0: USB ACM device 
 3261.159395] usbcore: registered new interface driver cdc_acm 
 3261.159398] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

I guess your arduino uno R3 should show something like this when you connect it via USB. Can you share that output?

3

Hi marel

Here you go:

dmesg --follow
... {connected uno R3, I see this:}
[192983.196771] usb 3-4: new full-speed USB device number 23 using xhci_hcd 
[192983.351175] usb 3-4: New USB device found, idVendor=2341, idProduct=0043, bcdDevice= 0.01 
[192983.351178] usb 3-4: New USB device strings: Mfr=1, Product=2, SerialNumber=220 
[192983.351180] usb 3-4: Manufacturer: Arduino (www.arduino.cc) 
[192983.351181] usb 3-4: SerialNumber: 7543730383035180F092 
[192983.352997] cdc_acm 3-4:1.0: ttyACM0: USB ACM device

to me, that looks OK.
Greez
chris

4

Same problem here. This bug has made me definitely move onto the official IDE download (that one works well). Unfortunately, the Arduino support in OpenSUSE is virtually nonexistent: the last time I reported a bug it was just closed because the Arduino IDE v2 was soon to be released and no further resources were to be spent in v1. That was a year ago…

5

And, the latest build attempt failed – <Welcome - openSUSE Build Service.

  • Which is weird – if the build failed, it shouldn’t have been published …

Looking at the v1.8.19 compressed Tar file from Arduino – <https://www.arduino.cc/en/software&gt; – the last changes were made on the 20th of December 2021.

  • A couple of things to be aware of –

The Arduino installation removes the ModemManager package.
There’s a compiled Java binary provided by Arduino dated the 11th of February 2020 – you’ll need to check if, any conflicts arise with the OpenJDK 11 Runtime Environment installed by default with Leap 15.3.

6

In the OBS version 1.8.19-lp153.2.1/jssc 2.8.0-lp153.8.1 the symbolic link to the jssc.jar in directory /usr/lib64/arduino/lib is broken


> cd /usr/lib64/arduino/lib/
> ls -l jssc-2.8.0.jar
lrwxrwxrwx 1 root root      34  5. Mär 11:42 jssc-2.8.0.jar -> ../../../share/java/jssc-2.8.0.jar

>ls -l ../../../share/java/jssc-2.8.0.jar 
ls: cannot access '../../../share/java/jssc-2.8.0.jar': No such file or directory

and so the java runtime does not know how to load the jssc-2.8.0.jar. If i fix the symbolic link for example with


> ln -fs /usr/lib64/java/jssc.jar jscc-2.8.0.jar

serial monitor works for me. A fact that confused me at first the OBS Arduino version installs java 1.8.0 explicit as a dependency. However, the jscc jar was compiled with OpenJdk 11 and therefore does not work with the old Java 1.8.0 runtime.