B4J Question jShell crashed

[Starchild]

Running on Ubuntu, sometimes calling command using jShell causes the crash. I'm not sure why. Doesn't happen all the time.

My main program calls the "service" Linux command then exits itself (ExitApplication).
Using SHL.Run(-1) ' to execute the service command.

Tried the ExitApplication, immediately following the SLH.Run(-1), delayed by a timer, and even using callsubdelayed back to "Main". All appear to have the same intermittent crash.

The returned error is,

main._appstart (java line: 441)
java.lang.RuntimeException: java.lang.NoClassDefFoundError: anywheresoftware/b4j/objects/Shell
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:108)
    at anywheresoftware.b4a.objects.Timer$TickTack$1.run(Timer.java:118)
    at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
    at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
    at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:136)
    at b4j.baseinterface.main._appstart(main.java:441)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:79)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:70)
    at b4j.baseinterface.main.main(main.java:29)
Caused by: java.lang.NoClassDefFoundError: anywheresoftware/b4j/objects/Shell
    at b4j.baseinterface.barrettcommsclass._start_baseinterfaceexecutor(barrettcommsclass.java:1974)
    at b4j.baseinterface.barrettcommsclass._restarttimer_tick(barrettcommsclass.java:1593)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:79)
    ... 12 more
Caused by: java.lang.ClassNotFoundException: anywheresoftware.b4j.objects.Shell
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 19 more

Unfortunately, the error report was truncated.

Does anyone have an idea where I should look?

 

[DonManfred]

ExitApplication, immediately following the SLH.Run(-1)

This is the problem. You should not do anything after the exitApplication

From the Online-Help:

 

[Erel]

It seems like the jShell library is missing. Is #MergeLibraries set to True?

 

[Starchild]

Yes. #MergeLibraries set to True

As Release, the same program usually works OK.
This error is intermitant.
I can't determine any differences in the operational circumstances.

I am also redirecting the log to a file.
code came from b4x.com
can't find the site reference now.

 

[Erel]

Open the compiled jar file with a zip tool and check whether the compiled class is there.

Make sure to use Java 8u40+ on the Linux computer.

 

[OliverA]

even using callsubdelayed back to "Main"

Would this not cause some sort of infinite loop? See https://stackoverflow.com/questions...-of-class-be-invoked-in-another-class-in-java. I think without code that actually shows/repeats the problem, it may be hard to diagnose what is going on.

 

[jmon]

You could also see if this thread helps:
https://www.b4x.com/android/forum/threads/run-jshell-in-separate-thread.73553/#post-467169

If I understood well, Linux kills sub-processes when closing an app.

Could you post an example script on how you call the "service" with jshell?