B4J Question Address already in use

[Declan]

I have a UI B4j app running on my Windows 2019 server.
When I launch the app, I get the following error:

main._appstart (java line: 121)
java.net.BindException: Address already in use: bind
    at java.base/sun.nio.ch.Net.bind0(Native Method)
    at java.base/sun.nio.ch.Net.bind(Net.java:555)
    at java.base/sun.nio.ch.Net.bind(Net.java:544)
    at java.base/sun.nio.ch.NioSocketImpl.bind(NioSocketImpl.java:629)
    at java.base/java.net.ServerSocket.bind(ServerSocket.java:393)
    at java.base/java.net.ServerSocket.<init>(ServerSocket.java:275)
    at java.base/java.net.ServerSocket.<init>(ServerSocket.java:168)
    at anywheresoftware.b4a.objects.SocketWrapper$ServerSocketWrapper.Initialize(SocketWrapper.java:226)
    at b4j.is.main._appstart(main.java:121)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
    at java.base/java.lang.reflect.Method.invoke(Method.java:578)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:111)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:98)
    at b4j.is.main.start(main.java:37)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:847)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:1589)

I cannot find the app in Task Manager.
I have also restarted the server.
Error persists.
I have attached the B4j app.
This app ran fine, but all of a sudden this error popped up.

 

[Chris2]

java.net.BindException: Address already in use: bind

Rather than it being a problem with your app, might it be that some other program is using the same address/port that your app is trying to bind to?