B4J Question Ubuntu Linux error when trying to show file location

[Nokia]

I am getting an error when on linux when I try to launch this code from my app.

fx.ShowExternalDocument(File.GetUri(strDecDirLoc, ""))

error:
java.lang.ClassNotFoundException: com.sun.deploy.uitoolkit.impl.fx.HostServicesFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.sun.javafx.application.HostServicesDelegate.lambda$getInstance$0(HostServicesDelegate.java:52)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.HostServicesDelegate.getInstance(HostServicesDelegate.java:45)
at javafx.application.HostServices.<init>(HostServices.java:52)
at javafx.application.Application.getHostServices(Application.java:334)
at anywheresoftware.b4j.objects.JFX.ShowExternalDocument(JFX.java:84)
at b4j.example.main._miveiwdec_action(main.java:1325)
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:93)
at anywheresoftware.b4a.BA$2.run(BA.java:165)
at com.sun.javafx.application.PlatformImpl.lambda$null$117(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$118(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$450(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:745)
main._miveiwdec_action (java line: 1325)
java.lang.NullPointerException
at javafx.application.HostServices.showDocument(HostServices.java:127)
at anywheresoftware.b4j.objects.JFX.ShowExternalDocument(JFX.java:84)
at b4j.example.main._miveiwdec_action(main.java:1325)
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:93)
at anywheresoftware.b4a.BA$2.run(BA.java:165)
at com.sun.javafx.application.PlatformImpl.lambda$null$117(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$118(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$450(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:745)

any body have any ideas?

also with this work on Mac OS X as well...

 

[Erel]

Are you using OpenJDK? Can you test it with Oracle JRE?

 

[Nokia]

Are you using OpenJDK? Can you test it with Oracle JRE?

yes I am using openJDK.

do I have to uninstall openJDK in order to user Oracle JRE?

I am kinda new to linux, do you have a good link to instructions for installing Oracle JRE?

 

[Erel]

See this tutorial: https://www.b4x.com/android/forum/threads/server-run-a-server-on-a-vps.60378/#content

You don't need to install the JRE, however if you start it with a double click then you will need to make sure that it uses the correct Java.

 

[Nokia]

See this tutorial: https://www.b4x.com/android/forum/threads/server-run-a-server-on-a-vps.60378/#content

You don't need to install the JRE, however if you start it with a double click then you will need to make sure that it uses the correct Java.

I have the Oracle JRE-8u102 unpacked to my home directory. you say I don't need to install it.. but how to I get the JAR to use the right one..

do i change the default in the system somewhere?

 

[billzhan]

nohup path_to_java/bin/java -jar somejar.jar > nohup.out &

You need to specify the full path to the unpacked java.

cd /path/to/{somejar.jar}  # make sure the File.dirapp is the Objects folder
nohup  /home/{yourname}/{JRE-8u102}/bin/java -jar {somejar.jar} > nohup.out &

 

[Nokia]

You need to specify the full path to the unpacked java.

cd /path/to/{somejar.jar}  # make sure the File.dirapp is the Objects folder
nohup  /home/{yourname}/{JRE-8u102}/bin/java -jar {somejar.jar} > nohup.out &

I home I am under standing and this right..

is this the command:

 cd /home/nokia/Desktop/ nohup /home/nokia/jre1.8.0.102/bin/java -jar  myjarfile.jar > nohup.out &

nothign happens.. if I take the & of the end it just changed dir..

 

[Nokia]

I home I am under standing and this right..

is this the command:

 cd /home/nokia/Desktop/ nohup /home/nokia/jre1.8.0.102/bin/java -jar  myjarfile.jar > nohup.out &

nothign happens.. if I take the & of the end it just changed dir..

ok.. I got it to work and not going to test the

 fx.ShowExternalDocument(File.GetUri(strDecDirLoc, ""))

 

[Nokia]

ok.. I got it to work and not going to test the

 fx.ShowExternalDocument(File.GetUri(strDecDirLoc, ""))

ok.. it seems to work but how ever.. it opens firefox and not any kind of file explorer.. any other ideas?

 

[Erel]

You can use jShell instead and start whichever program you like.

 

[Nokia]

You can use jShell instead and start whichever program you like.

I am having a hard time trying to get the jshell to open an app on linux, do you have an example on how to put the parameters?

 

[Erel]

There are many examples that use jShell: https://www.b4x.com/android/forum/pages/results/?query=b4j+jshell